Combined Science IGCSE Exam Academic year 2015-16

Combined Science IGCSE ExamAcademic year 2015-16

Prepare The exams are on Thursday 12th and Wednesday 25th May. You should use the time

from now to then productively by spending an hour or so a night (a couple of hours a day at

the weekends) quietly in your room making notes and revising. Just reading through is not

revising. Actively do questions or create revision resources.

During the exams, be ready, have the right equipment. Have the right amount of sleep (8

hours). The more preparation you do now means the less worry you will have later.

Exam Materials – For each of your exams you will need pens, pencils, rubber, sharpener,

ruler, protractor, calculator, pair of compasses. Prepare a clear pencil case containing all of

your equipment for the start of the exams as it may not be available on the exam day.

Exam Timetable:

Topics to revise for the exam.

BIOLOGY1. Characteristics and

classification ofliving organisms

2. Cells3. Enzymes4. Nutrition5. Transportation6. Respiration7. Coordination and

response8. Reproduction9. Energy flow in

ecosystems10. Human influences

on ecosystems

CHEMISTRY1. The particulate

nature of matter2. Experimental

techniques3. Atoms, elements

and compounds4. Stoichiometry5. Electricity and

chemistry6. Energy changes in

chemical reactions7. Chemical reactions8. Acids, bases and

salts9. The Periodic Table10. Metals11. Air and water12. Organic chemistry

PHYSICS1. Motion2. Matter and forces3. Energy, work and

power4. Simple kinetic

molecular model ofmatter

5. Matter and thermalphysics

6. Transfer of thermalenergy

7. Waves8. Light9. Electromagnetic

spectrum10. Sound11. Electricity12. Electric circuits

Exam date Exam type12th May Paper 6 Alternative to practical25th May Paper 1 Multiple choice (extended)

25th May Paper 2 Short answer (extended)

AnswersAlways read and use the information given in the question. If it seems you don’t know how to

answer a question re-read the information you have been given and make sure you’ve

understood it. Pick out the key words and take a moment to think about your answer. Ask

yourself if what you are writing is what the question is looking for.

Paper 1 is the multiple choice paper. You can normally eliminate 2 of the answers

straight away. Then look carefully at the wording of the remaining two. The wording may be

very similar so you need to know your content.

For all the written papers, make sure you use the syllabus to learn the difference

between prompt words. For example, when describing you say what you see, but when you

explain you say why.

Paper 2 requires you to give short answers. Look at the number of marks the question

is worth, that is how many separate points you should make. If someone can ask you “why”

then you’ve not answered in enough detail. Ensure when you are revising, you write all the key

words for each topic. It is very easy to lose a mark for explaining by not including a key word. If

the question asks you to quote data, then you must do so! Quote pairs of data and the units

used in the table or graph you are given. Always show your calculations as there may be

marks even if you don’t have the correct final answer.

Paper 6 needs you to learn the practicals for each course. Learn them step by step and

all the tests from the appendix in each syllabus. Look at the mark schemes to learn what you

need to include when drawing a graph. Write to the same number of decimal places that any

other data in the question uses. If you are asked how you carry out a practical safely, include

one safety feature such as “goggles”, it will give you an easy mark.

This document consists of 19 printed pages and 1 blank page.

IB14 06_0653_11/5RP © UCLES 2014 [Turn over

*8329070264*

Cambridge International Examinations Cambridge International General Certificate of Secondary Education

COMBINED SCIENCE 0653/11

Paper 1 Multiple Choice May/June 2014

45 minutes

Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended)

READ THESE INSTRUCTIONS FIRST

Write in soft pencil.

Do not use staples, paper clips, glue or correction fluid.

Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you.

DO NOT WRITE IN ANY BARCODES.

There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

Any rough working should be done in this booklet.

A copy of the Periodic Table is printed on page 20.

Electronic calculators may be used.

2

© UCLES 2014 0653/11/M/J/14

1 What are characteristics of all living organisms?

A reproduction, nutrition, growth and sensitivity

B respiration, nutrition, digestion and photosynthesis

C respiration, nutrition, digestion and transpiration

D sensitivity, respiration, growth and photosynthesis 2 What causes oxygen to diffuse into the blood from an alveolus in the lungs?

A The oxygen concentration in the alveolus is higher than in the atmosphere.

B The oxygen concentration in the alveolus is lower than in the blood.

C The oxygen concentration in the atmosphere is higher than the carbon dioxide concentration.

D The oxygen concentration in the blood is lower than in the alveolus. 3 Which statements about enzymes are correct?

1 Their activity is always increased at a higher temperature.

2 Their activity is affected by the pH of the solution they are in.

3 They are carbohydrates.

4 They function as biological catalysts.

A 1, 2 and 3 B 1, 3 and 4 C 1 and 4 D 2 and 4

4 The diagram shows a leaf from a plant kept in the dark for 48 hours.

green area

white area

Which colours will be obtained if the leaf is then tested for starch with iodine solution?

green area white area

A blue-black blue-black

B blue-black brown

C brown blue-black

D brown brown

3

© UCLES 2014 0653/11/M/J/14 [Turn over

5 The diagram shows a section through the human heart. The four heart valves are labelled P, Q, R and S.

P

SR

Q

Which valves are open when the atria contract?

P Q R S

A key

B = valve open

C = valve closed

D

6 In which physical state is water when it is absorbed and when it is lost by a plant?

absorbed lost

A liquid liquid

B liquid vapour

C vapour liquid

D vapour vapour

7 Which equation represents aerobic respiration?

A carbon dioxide + glucose → oxygen + water

B carbon dioxide + water → glucose + oxygen

C glucose + oxygen → carbon dioxide + water

D glucose + water → carbon dioxide + oxygen

4

© UCLES 2014 0653/11/M/J/14

8 The graph shows the changes in volume of air in a person’s lungs while at rest.

volumeof airin lungs

time

The person runs a race.

Which graph shows the changes in the volume of air immediately after the person finishes the race? All five graphs use the same scales.


time

A


time

B


time

C


time

D

9 Which situation is most likely to cause an increase in the secretion of adrenaline?

A A person eats a meal rich in glucose.

B A person is awoken suddenly by thunder and lightning.

C A person’s blood glucose level decreases because they have not eaten.

D A person’s pulse rate falls while they are asleep.

5


10 Diagram 1 shows a growing seedling after the first few days’ growth.

The seedling was then rotated, held in the position shown in diagram 2 and placed in the dark for three days.

diagram 1 diagram 2

What is the shape of the seedling three days later?

A B C D

11 What is the function of the sepals in most insect-pollinated plants?

A to attract insects with colour

B to make nectar

C to manufacture pollen

D to protect flower buds

6

© UCLES 2014 0653/11/M/J/14

12 The diagram shows a section through a flower.

P

Q

R

Where are the male and female gametes (sex cells) made?

male gametes female gametes

A P Q

B P R

C Q P

D Q R

13 Which process absorbs carbon dioxide from the atmosphere?

A combustion

B decay

C photosynthesis

D respiration 14 The table shows the formulae of three substances.

substance formula

methane CH4

water H2O

oxygen O2

Which statement is correct?

A Methane is made from five types of atom.

B Methane, water and oxygen are molecules.

C Only methane and water are molecules.

D Oxygen is made from two types of atom.

7


15 A mixture contains two liquids.

One liquid has a boiling point of 120 °C and the other boils at 160 °C.

They are separated by fractional distillation.

QP

water

Rheat heat heat

Which apparatus is used to separate the two liquids?

A P and Q B P only C Q only D R only 16 The diagram represents an atom.

nnn nnn

p p p pp

e

e

e

e

e

key

proton

neutron

electron

nucleus

What is the nucleon number of this atom?

A 2 B 4 C 9 D 13

8

© UCLES 2014 0653/11/M/J/14

17 Sodium and fluorine react together violently to form sodium fluoride.

2Na + F2 → 2NaF

Which changes occur to each atom when sodium and fluorine react together?

sodium atom fluorine atom

A gains one electron loses two electrons

B gains two electrons loses one electron

C loses one electron gains one electron

D loses two electrons gains two electrons

18 The formula of the hydrocarbon octane is C8H18.

What are the products of complete combustion of octane?

A carbon and hydrogen

B carbon and water

C carbon dioxide and water

D carbon monoxide and water 19 A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four

oxygen atoms.

What is the formula of this molecule?

A H3PO4 B H3(PO)4 C 3HPO4 D 3HP4O

9


20 The apparatus shown is used to test a property of compound R.

lamp

water

beaker

The lamp does not light when the beaker contains pure water. When compound R is dissolved in the water, the lamp lights.

Which statements about R are correct?

type of bonding elements of compound R

A covalent a metal and a non-metal

B covalent non-metals only

C ionic non-metals only

D ionic a metal and a non-metal

21 The diagram shows the electrolysis of molten lead(II) bromide.

carbon electrode Y

molten lead(II) bromide

carbon electrode X + –

Which statement is correct?

A Bromine is formed at electrode Y.

B Hydrogen is formed at electrode X.

C Lead is formed at electrode Y.

D Oxygen is formed at electrode X.

10

© UCLES 2014 0653/11/M/J/14

22 Limestone chips react with hydrochloric acid.

Which change decreases the speed of the reaction?

A adding a catalyst

B decreasing the temperature

C increasing the concentration of hydrochloric acid

D using limestone powder

23 Which substance does not react with dilute hydrochloric acid to form copper(II) chloride?

A copper

B copper carbonate

C copper hydroxide

D copper oxide 24 An unknown element is tested using the apparatus shown.

unknownelement

battery

lamp

The lamp did not light.

Which statement about the element is correct?

A It is a Group I metal.

B It is an alloy.

C It is a non-metal.

D It is a transition element.

11


25 Magnesium can be used to extract iron from iron(III) oxide, Fe2O3 to give magnesium oxide and iron.

The equation for the reaction is shown.

2Mg + Fe2O3 → Mg2O3 + 2Fe

Why is magnesium used in this reaction?

A It is less reactive than iron and oxidises iron(III) oxide.

B It is less reactive than iron and reduces iron(III) oxide.

C It is more reactive than iron and oxidises iron(III) oxide.

D It is more reactive than iron and reduces iron(III) oxide.

26 The diagram shows the composition of air.

Which gas is shown by the shaded part?

A carbon dioxide

B nitrogen

C noble gases

D oxygen 27 Which statement describes a hydrocarbon?

A a compound that burns to form carbon dioxide and hydrogen

B a compound that contains carbon and hydrogen only

C a compound that only contains ionic bonds

D a compound that reacts easily with metals

12

© UCLES 2014 0653/11/M/J/14

28 The distance / time graph shows the motion of a car.

00

distance

time

XY

Which row describes the speed of the car in section X and the speed of the car in section Y of the graph?

speed in section X speed in section Y

A constant constant

B constant decreasing

C increasing constant

D increasing decreasing

29 A glass tank contains some water.

water

P

Q

U

T

R

S

Only the length PQ and the width QU of the tank are known.

Which other distance must be known to calculate the volume of the water?

A RT B ST C SU D TU

13


30 A worker on a building site lifts a heavy concrete block onto a lorry. He then lifts a lighter block the same distance in the same time.

Which row about the work done and the power exerted is correct?

work done in lifting the blocks power exerted by worker

A less for the lighter block less for the lighter block

B less for the lighter block the same for both blocks

C more for the lighter block more for the lighter block

D the same for both blocks more for the lighter block

31 The diagram shows how the arrangement of the atoms in a substance changes during a change

of state.

Which change of state is shown?

A gas to liquid

B liquid to gas

C liquid to solid

D solid to liquid

14

© UCLES 2014 0653/11/M/J/14

32 A substance has a melting point of -114 °C and a boiling point of 79 °C. Some of the substance is placed in a container that is then sealed.

sealed

container

substanceat 60 °C

The substance and the sealed container are kept at a temperature of 60 °C for several hours.

In which state or states is the substance after this time?

A solid only

B solid and liquid

C liquid only

D liquid and gas

15


33 A solar panel is used to heat water. The hot water is then stored in a water tank. Water stored in the water tank is returned to the solar panel for further heating when the water cools. There is no pump to move the hot water to the water tank and the cooler water back to the panel.

Which arrangement enables the hot water from the solar panel to move freely to the water tank and the cooler water to return to the solar panel?

solarpanel

watertank

B

solarpanel

watertank

A

solarpanel

watertank

D

solarpanel

watertank

C

ABOVE

BELOW

ABOVE

ABOVE

ABOVE

BELOW BELOW

BELOW

34 The diagram shows a section of a rope.

Four waves pass along the rope every second.

Each wave travels 80 cm in one second.

20 cm

5 cm

What is the speed of the wave?

A 4.0 cm / s B 5.0 cm / s C 20 cm / s D 80 cm / s

16

© UCLES 2014 0653/11/M/J/14

35 The diagram shows a ray of light passing from air into glass.

wx

yz

airglass

ray of light

Which labelled angles are the angle of incidence and the angle of refraction?

angle of

incidence angle of

refraction

A w y

B w z

C x y

D x z

36 The diagram shows the electromagnetic spectrum.

radio waves

microwaves infra-red waves

visible light

ultraviolet waves

X-rays gamma rays

Which statement about electromagnetic waves is correct?

A Microwaves are used in television remote controllers.

B Microwaves have larger wavelengths than visible light.

C Radio waves are used to send television signals from satellites to Earth.

D Radio waves have higher frequencies than X-rays.

17


37 A boy on an island is 500 m from some cliffs.

cliffs

island

500 m

He shouts and he hears an echo from the cliffs.

Sound travels at 340 m / s through the air.

What is the time interval between when the boy shouts and when he hears the echo?

A 340

500 s B 340

5002× s C 005

340 s D 500

3402× s

38 Which group contains a material that prevents electrical charge from flowing through it?

A aluminium, copper, mercury

B brass, nickel, steel

C glass, gold, zinc

D silver, iron, lead 39 Which circuit can be used to determine the resistance of resistor R?

V

A

C

R

D

RA

V

A

V AR

B

RA V

18

© UCLES 2014 0653/11/M/J/14

40 The diagram shows a circuit containing three lamps P, Q and R.

All the lamps are lit.

P

Q

R

The fuse melts (blows).

Which lamps go out?

A P and Q B P only C Q and R D Q only

19

© UCLES 2014 0653/11/M/J/14

BLANK PAGE

20

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.

Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

© UCLES 2014 0653/11/M/J/14

Gro

up

140

Ce

Cer

ium

58

141

PrP

rase

odym

ium

59

144

Nd

Neo

dym

ium

60

PmP

rom

ethi

um61

150

SmS

amar

ium

62

152

EuE

urop

ium

63

157

Gd

Gad

olin

ium

64

159

Tb Terb

ium

65

162

Dy

Dys

pros

ium

66

165

Ho

Hol

miu

m67

167

Er Erb

ium

68

169

Tm Thul

ium

69

173

YbY

tterb

ium

70

175

LuLu

tetiu

m71

232

Th Thor

ium

90

PaP

rota

ctin

ium

91

238 U

Ura

nium

92

Np

Nep

tuni

um93

PuP

luto

nium

94

Am

Am

eric

ium

95

Cm

Cur

ium

96

Bk

Ber

keliu

m97

Cf

Cal

iforn

ium

98

EsE

inst

eini

um99

Fm Ferm

ium

100

Md

Men

dele

vium

101

No

Nob

eliu

m10

2

LrLa

wre

nciu

m10

3

1 HH

ydro

gen

1

7 LiLi

thiu

m3

23 Na

Sod

ium

11

24 Mg

Mag

nesi

um12

40 Ca

Cal

cium

20

45 ScS

cand

ium

21

48 TiTi

tani

um22

51 VVa

nadi

um23

52 Cr

Chr

omiu

m24

55 Mn

Man

gane

se25

56 Fe Iron

26

59 Co

Cob

alt

27

59 Ni

Nic

kel

28

64 Cu

Cop

per

29

65 Zn Zinc

30

70 Ga

Gal

lium

31

27 Al

Alu

min

ium

13

11 B Bor

on5

12 CC

arbo

n6

14 NN

itrog

en7

16 OO

xyge

n8

19 FFl

uorin

e9

28 Si Sili

con

14

31 PP

hosp

horu

s15

32 S Sul

fur

16

35.5 Cl

Chl

orin

e17

40 Ar

Arg

on18

20 Ne

Neo

n10

4 He

Hel

ium

2

73 Ge

Ger

man

ium

32

75 As

Ars

enic

33

79 SeS

elen

ium

34

80 Br

Bro

min

e35

84 Kr

Kry

pton

36

39 KP

otas

sium

19

88 SrS

tront

ium

38

89 YY

ttriu

m39

91 ZrZi

rcon

ium

40

93 Nb

Nio

bium

41

96 Mo

Mol

ybde

num

42

TcTe

chne

tium

43

101

Ru

Rut

heni

um44

103

Rh

Rho

dium

45

106

PdP

alla

dium

46

108

Ag

Silv

er47

112

Cd

Cad

miu

m48

115

In Indi

um49

119

Sn Tin

50

122

SbA

ntim

ony

51

128

TeTe

lluriu

m52

127 I

Iodi

ne53

131

Xe Xen

on54

137

Ba

Bar

ium

56

139

LaLa

ntha

num

57

*

178

Hf

Haf

nium

72

181

TaTa

ntal

um73

184 W

Tung

sten

74

186

Re

Rhe

nium

75

190

Os

Osm

ium

76

192

Ir Iridi

um77

195 Pt

Pla

tinum

78

197

Au

Gol

d79

201

Hg

Mer

cury

80

204 Tl

Thal

lium

81

207

Pb Lead

82

209 Bi

Bis

mut

h83

PoP

olon

ium

84

At

Ast

atin

e85

Rn

Rad

on86

FrFr

anci

um87

227

Ac

Act

iniu

m89

9 Be

Ber

ylliu

m4

III

IIIIV

VV

IV

II0

85 Rb

Rub

idiu

m37

133

Cs

Cae

sium

55

226

Ra

Rad

ium

88

The

volu

me

of o

ne m

ole

of a

ny g

as is

24

dm3

at ro

om te

mpe

ratu

re a

nd p

ress

ure

(r.t.p

.).

a Xb

a =

rela

tive

atom

ic m

ass

X =

atom

ic s

ymbo

l

b =

prot

on (a

tom

ic) n

umbe

r

Key

* 58-

71 L

anth

anoi

d se

ries

90-1

03 A

ctin

oid

serie

s

DAT

A SH

EET

The

Perio

dic

Tabl

e of

the

Elem

ents

CAMBRIDGE INTERNATIONAL EXAMINATIONS

International General Certificate of Secondary Education

MARK SCHEME for the May/June 2014 series

0653 COMBINED SCIENCE

0653/11 Paper 1 (Multiple Choice), maximum raw mark 40

Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2014 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.

Mark Scheme Syllabus Paper

IGCSE – May/June 2014 0653 11

© Cambridge International Examinations 2014

Question Number

Key Question Number

Key

1 A 21 C

2 D 22 B

3 D 23 A

4 D 24 C

5 A 25 D

6 B 26 B

7 C 27 B

8 D 28 A

9 B 29 D

10 B 30 A

11 D 31 B

12 B 32 D

13 C 33 B

14 B 34 D

15 D 35 D

16 C 36 B

17 C 37 B

18 C 38 C

19 A 39 A

20 D 40 C

This document consists of 24 printed pages.

IB14 06_0653_21/4RP © UCLES 2014 [Turn over

*9735649846*



Paper 2 (Core) May/June 2014

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.


Write your Centre number, candidate number and name on all the work you hand in.

Write in dark blue or black pen.

You may use an HB pencil for any diagrams or graphs.



Answer all questions.


You may lose marks if you do not show your working or if you do not use appropriate units.

A copy of the Periodic Table is printed on page 24.

At the end of the examination, fasten all your work securely together.

The number of marks is given in brackets [ ] at the end of each question or part question.

2

© UCLES 2014 0653/21/M/J/14

1 (a) Fig. 1.1 shows an experiment to compare how three metals react with dilute hydrochloric acid.

magnesiumcopperX magnesium

gas Ggas G

Fig. 1.1 In two of the test-tubes, bubbles of a gas G are produced. Gas G is an element.

(i) State the name of gas G. [1]

(ii) Describe a test for gas G.

test

result

[2]

(iii) List the four elements X, copper, magnesium and G in order of reactivity.

most reactive

least reactive [2]

(iv) Suggest the identity of metal X. [1]

3


(b) Fig. 1.2 shows how a teacher could use a Bunsen burner to heat a mixture of carbon and copper oxide until it starts to glow.

mixture of carbonand copper oxide

Fig. 1.2

The mixture glows even more brightly for some time after the burner is removed. Carbon has reduced copper oxide to copper. (i) State what is meant by the term reduced.

[1]

(ii) Name the other product that is formed in this reaction.

[1]

(c) Lead can be produced from molten lead bromide using electrolysis, as shown in Fig. 1.3.

powersupply

carbon electrodes

molten lead bromide

+ –

Fig. 1.3 (i) Mark, with the letter P and a label line, the position on the diagram where lead first

appears after the circuit is connected. [1] (ii) Name the other element that is formed during the electrolysis.

[1]

4

© UCLES 2014 0653/21/M/J/14

2 Fig. 2.1 shows a food web of the organisms in a woodland containing oak trees.

oak trees

squirrelsbeetles

rabbits greenfly

frogs

hawks

blackbirds

foxes

Fig. 2.1 (a) State the source of energy for this food web.

[1]

(b) From the food web, name (i) one producer,

[1]

(ii) one herbivore.

[1]

(c) The food web is a network of interconnected food chains. One food chain in Fig. 2.1 with three stages is shown.

oak tree rabbit hawk

Write down a food chain from Fig. 2.1 which has four stages. [2]

5


(d) The oak trees are cut down. Suggest two possible effects this could have on the organisms in the food web.

1

2

[2]

(e) Describe how the concentration of carbon dioxide in the atmosphere may change as the

result of the oak trees being cleared from the woodland. Explain why this happens.

[2]

6

© UCLES 2014 0653/21/M/J/14

3 Fig. 3.1 shows a small torch (flashlight). The torch contains cells (batteries), a lamp and a switch.

Fig. 3.1 (a) Draw a circuit diagram for the torch using standard circuit symbols. [2] (b) Fig. 3.2 shows a cell and lamp taken from the torch.

1.5 V Magicell3.0 V1.2 A

Fig. 3.2 (i) State how many cells are needed to light up this lamp. Give a reason for your answer.

number of cells needed

reason

[1]

(ii) State what is meant by the quantity 1.2 A on the lamp.

[1]

7


(c) After a long time in use with the same cells, the torch lamp becomes less bright. A student says that this is because the cell is running out of energy. Draw a circuit, including an ammeter and a voltmeter, that could be used to test this. [2]

8

© UCLES 2014 0653/21/M/J/14

4 (a) Petroleum (crude oil) is a fossil fuel consisting of a mixture of different hydrocarbons. Fig. 4.1 shows the industrial apparatus used to separate useful products from petroleum.

tower

refinery gases

naphtha

bitumen

petroleumvapour in

Fig. 4.1 Petroleum is vaporised and passed up a tower. Useful products from petroleum condense at

different positions in the tower. (i) State the name of the process shown in Fig. 4.1.

[1]

(ii) Different products from this process have different boiling point ranges. State how the boiling point of a product affects the position in the tower where a product

will condense.

[1]

(iii) Three of the useful products obtained from petroleum are shown in Fig. 4.1. State the name of another useful product that is separated from petroleum. State one use of this product.

name of product

use

[2]

9


(b) Table 4.1 contains some information about gases in the Earth’s atmosphere.

Table 4.1

gases in the Earth’s atmosphere percentage

carbon dioxide very small

nitrogen

oxygen

other gases about 1%

water vapour variable

Complete Table 4.1 to show the percentages of nitrogen and oxygen in the atmosphere. [2] (c) Natural gas is a fossil fuel consisting mostly of methane. It is used as a fuel to heat a

greenhouse for growing vegetables. (i) Describe the changes to the atmosphere in a greenhouse that will occur.

[2]

(ii) Burning methane is an exothermic chemical change. State the meaning of

exothermic,

chemical change.

[2]

10

© UCLES 2014 0653/21/M/J/14

5 (a) A boy looks at himself in a mirror and waves his hand. Fig. 5.1 shows what he sees in the mirror.

Fig. 5.1 Which hand is he waving? Explain your answer.

[1]

(b) The boy uses headphones to listen to the radio. (i) State the useful energy transformation that occurs in his headphones.

from energy to energy [1]

(ii) The radio emits sounds with frequencies between 100 Hz and 10 000 Hz. Explain why the boy is able to hear all the sounds emitted through the headphones. The

boy has normal hearing.

[1]

11


(c) The boy swims in an outdoor swimming pool. He swims one length of the 25 metre long pool in 40 seconds.

(i) Calculate his speed. State the formula you use, show your working and state the units of your answer. formula working

speed = units [3]

(ii) Fig. 5.2 shows two forces, the driving force and the frictional force, acting on the boy as

he swims.

frictional force driving force

Fig. 5.2 The boy exerts a driving force of 100 N and swims at a constant speed. Deduce the value of the frictional force and explain your reasoning.

The frictional force is N

because

[1]

12

© UCLES 2014 0653/21/M/J/14

Fig. 5.3 shows waves created by a wind blowing at constant speed across the water in the pool.

P RQ

wind direction

Fig. 5.3 (iii) On Fig. 5.3, mark clearly and label one complete wavelength of the wave motion

between P and Q. [1] (iv) As the water in the pool gets shallower between Q and R, the wavelength becomes

shorter. Use Fig. 5.3 to state one property of the wave motion that increases between Q and R.

[1]

(d) The boy switches on a television set using a remote control. Fig. 5.4 shows some of the parts of the electromagnetic spectrum. In the correct blank box on Fig. 5.4, write the name of the part of the spectrum used by the

remote control.

X-rays visible light microwaves

Fig. 5.4

[2]

13


Please turn over for Question 6.

14

© UCLES 2014 0653/21/M/J/14

6 Fig. 6.1 shows part of the human life cycle. The cells are not drawn to scale.

sperm cellsperm cell egg cell

zygote

ball of cells

A

Fig. 6.1

(a) From Fig. 6.1

(i) name a diploid cell, [1]

(ii) State the term to describe what happens at A.

[1]

(b) Cell division of the zygote produces a ball of cells. Describe in detail where in the female reproductive system this ball of cells is positioned for

the next stage of development.

[2]

15


(c) Table 6.1 summarises some of the nutrients contained in 100 g of milk.

Table 6.1

nutrient mass in milk sample

protein 1.2 g

fat 3.8 g

carbohydrate 7.6 g

vitamin C 3.9 mg

calcium 33.0 mg

Name one vitamin, present in milk but not included in Table 6.1, which is essential for

healthy growth of the baby and describe the function of this vitamin in the body.

vitamin

function [2]

(d) Energy is released from milk by respiration. 1 g of fat releases 37 kJ of energy. Use the information about milk in Table 6.1 to calculate how much energy can be released

from the fat in the 100 g sample of milk. Show your working.

energy = kJ [2]

16

© UCLES 2014 0653/21/M/J/14

7 (a) Table 7.1 shows some of the properties of the halogens in Group VII of the Periodic Table.

Table 7.1

period halogen colour physical state at

room temperature

3 chlorine pale yellow-green gas

4 bromine dark red-brown liquid

5 iodine blue-black solid

Describe one trend in the physical properties of chlorine, bromine and iodine.

[1]

(b) (i) A dilute solution of chlorine is added to a colourless solution of potassium bromide. Describe what is seen.

[1]

(ii) Write a word equation for this reaction.

+ +

[2] (c) Fig. 7.1 shows the arrangement of the outer electrons of the atoms in a chlorine molecule,

Cl2.

ClCl

Fig. 7.1

State the name of this type of bonding. [1]

17


(d) Chlorine is used in the purification of the public water supply. Explain why chlorine is added to water supplied to homes.

[2]

18

© UCLES 2014 0653/21/M/J/14

8 Fig. 8.1 shows a simple type of air conditioner called a ‘swamp cooler’ that is used in buildings in dry desert places.

cool, damp air out

hot, dry air in

Fig. 8.1 Hot dry air is blown by a fan over the surface of water in a metal container. The hot dry air

evaporates some of the water. The air coming out of the swamp cooler is cool and damp. (a) The boxes in Fig. 8.2 show different ways in which atoms and molecules may be arranged in

different situations. Three materials found in the swamp cooler are air, metal and water. Draw lines from the materials in the left column to the correct arrangement of atoms or

molecules for each material in the right column. One has been done for you.

air

water

metal

Fig. 8.2 [2]

19


(b) (i) Explain, referring to molecules of water, why evaporation of water cools the remaining water.

[2]

(ii) Describe how the water cools the hot air.

[1]

(c) In buildings in hot desert countries, where days are hot and nights can be very cold, windows

with steel frames are often used. Fig. 8.3 shows how a space is left between the steel frame and the mudbricks of the

surrounding wall.

space between frame andsurrounding mudbrick

Fig. 8.3 Explain why it is necessary to leave this space between the window frame and the

mudbricks.

[1]

20

© UCLES 2014 0653/21/M/J/14

(d) A mudbrick is 30 cm long, 15 cm wide and 10 cm thick, and has a mass of 7 500 g. (i) Calculate the volume of the mudbrick in cubic centimetres.

cm3 [1]

(ii) Calculate the density of the mudbrick in g / cm3. State the formula that you use and show your working. formula: working

density = g / cm3 [2]

21



22

© UCLES 2014 0653/21/M/J/14

9 (a) Table 9.1 shows diagrams of two blood cells. Complete Table 9.1 to show the names and functions of these cells. [4]

Table 9.1

diagram function of cellname of cell

(b) Fig. 9.1 is a flowchart to show the circulation of blood in the body.

heart

lungsbody tissues

heart

direction ofblood flow

blood vessel Q

blood vessel P

Fig. 9.1 Complete the paragraph using words or phrases from the list. You may use each word or phrase once, more than once, or not at all.

aorta body left lungs

pulmonary artery pulmonary vein right valves

Blood leaves the ventricle of the heart to go through

blood vessel P, which is the . It then goes to the

lungs. There are in the heart to make sure there is

a one-way flow of blood. [3]

23

© UCLES 2014 0653/21/M/J/14

(c) The composition of blood changes as it flows through the tissues of the small intestine. State (i) one substance that leaves the blood as it flows through the tissues of the small

intestine,

[1]

(ii) two substances that enter the blood as it flows through the tissues of the small intestine.

[2]

24

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.

Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

© UCLES 2014 0653/21/M/J/14

Gro

up

140

Ce

Cer

ium

58

141

PrP

rase

odym

ium

59

144

Nd

Neo

dym

ium

60

PmP

rom

ethi

um61

150

SmS

amar

ium

62

152

EuE

urop

ium

63

157

Gd

Gad

olin

ium

64

159

Tb Terb

ium

65

162

Dy

Dys

pros

ium

66

165

Ho

Hol

miu

m67

167

Er Erb

ium

68

169

Tm Thul

ium

69

173

YbY

tterb

ium

70

175

LuLu

tetiu

m71

232

Th Thor

ium

90

PaP

rota

ctin

ium

91

238 U

Ura

nium

92

Np

Nep

tuni

um93

PuP

luto

nium

94

Am

Am

eric

ium

95

Cm

Cur

ium

96

Bk

Ber

keliu

m97

Cf

Cal

iforn

ium

98

EsE

inst

eini

um99

Fm Ferm

ium

100

Md

Men

dele

vium

101

No

Nob

eliu

m10

2

LrLa

wre

nciu

m10

3

1 HH

ydro

gen

1

7 LiLi

thiu

m3

23 Na

Sod

ium

11

24 Mg

Mag

nesi

um12

40 Ca

Cal

cium

20

45 ScS

cand

ium

21

48 TiTi

tani

um22

51 VVa

nadi

um23

52 Cr

Chr

omiu

m24

55 Mn

Man

gane

se25

56 Fe Iron

26

59 Co

Cob

alt

27

59 Ni

Nic

kel

28

64 Cu

Cop

per

29

65 Zn Zinc

30

70 Ga

Gal

lium

31

27 Al

Alu

min

ium

13

11 B Bor

on5

12 CC

arbo

n6

14 NN

itrog

en7

16 OO

xyge

n8

19 FFl

uorin

e9

28 Si Sili

con

14

31 PP

hosp

horu

s15

32 S Sul

fur

16

35.5 Cl

Chl

orin

e17

40 Ar

Arg

on18

20 Ne

Neo

n10

4 He

Hel

ium

2

73 Ge

Ger

man

ium

32

75 As

Ars

enic

33

79 SeS

elen

ium

34

80 Br

Bro

min

e35

84 Kr

Kry

pton

36

39 KP

otas

sium

19

88 SrS

tront

ium

38

89 YY

ttriu

m39

91 ZrZi

rcon

ium

40

93 Nb

Nio

bium

41

96 Mo

Mol

ybde

num

42

TcTe

chne

tium

43

101

Ru

Rut

heni

um44

103

Rh

Rho

dium

45

106

PdP

alla

dium

46

108

Ag

Silv

er47

112

Cd

Cad

miu

m48

115

In Indi

um49

119

Sn Tin

50

122

SbA

ntim

ony

51

128

TeTe

lluriu

m52

127 I

Iodi

ne53

131

Xe Xen

on54

137

Ba

Bar

ium

56

139

LaLa

ntha

num

57

*

178

Hf

Haf

nium

72

181

TaTa

ntal

um73

184 W

Tung

sten

74

186

Re

Rhe

nium

75

190

Os

Osm

ium

76

192

Ir Iridi

um77

195 Pt

Pla

tinum

78

197

Au

Gol

d79

201

Hg

Mer

cury

80

204 Tl

Thal

lium

81

207

Pb Lead

82

209 Bi

Bis

mut

h83

PoP

olon

ium

84

At

Ast

atin

e85

Rn

Rad

on86

FrFr

anci

um87

227

Ac

Act

iniu

m89

9 Be

Ber

ylliu

m4

III

IIIIV

VV

IV

II0

85 Rb

Rub

idiu

m37

133

Cs

Cae

sium

55

226

Ra

Rad

ium

88

The

volu

me

of o

ne m

ole

of a

ny g

as is

24

dm3

at ro

om te

mpe

ratu

re a

nd p

ress

ure

(r.t.p

.).

a Xb

a =

rela

tive

atom

ic m

ass

X =

atom

ic s

ymbo

l

b =

prot

on (a

tom

ic) n

umbe

r

Key

* 58-

71 L

anth

anoi

d se

ries

90-1

03 A

ctin

oid

serie

s

DAT

A SH

EET

The

Perio

dic

Tabl

e of

the

Elem

ents




0653 COMBINED SCIENCE

0653/21 Paper 2 (Core Theory), maximum raw mark 80

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2014 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.




(a) (i) hydrogen ; [1] (ii) flame ; pops ; [2] (ecf for (a) (ii)) (iii) magnesium X copper ; (i.e. X below magnesium and above copper) magnesium X G copper ; (i.e. G below magnesium and X in any order, and above copper) [2] (iv) zinc / iron / A other metals with electronegativity between that of magnesium

and iron ; [1] (b) (i) removal / loss of oxygen ; gain of electrons ; [max 1] (ii) carbon dioxide ; [1] (c) (i) P at or near negative electrode within electrolyte ; [1] (ii) bromine ; [1] [Total 10]




2 (a) Sun ; [1] (b) (i) oak tree ; [1] (ii) beetles / greenfly / rabbits / squirrels ; [1] (c) oak tree beetles blackbirds hawks ;; or oak tree greenfly frogs hawks ;; (1 mark correct sequence of organisms, 1 mark correct arrows) [2] (d) their numbers may decrease ; food supplies may become scarce ; [2] (e) (concentration) increases ; because less (carbon dioxide taken in for)

photosynthesis ; [2] [Total 9]




3 (a)

symbols all correct ; circuit connected correctly ; (either one or two cells used) [2] (b) (i) (2) lamp needs (p.d. of) 3V (to light), so needs 2 × 1.5=3V cells (owtte) ; [1] (ii) lamp takes current of 1.2A when lit (owtte) ; [1] (c)

voltmeter connected correctly ; ammeter connected correctly ; [2] [Total 6]

A

V




4 (a) (i) fractional distillation / fractionation ; [1] (ii) the lower the boiling point, the higher up the tower it is released / condenses ; [1] (iii) gasoline (petrol) / diesel / fuel oil / A kerosene ; used as fuel for transport / heating ; [2] (b) nitrogen: 78% ; oxygen: 21% ; [2] (c) (i) increase in water (vapour) ; increase in carbon dioxide ; decrease in oxygen ; temperature increases ; [max 2] (ii) heat energy released / temperature increases ; new substance(s) are formed ; [2] [Total 10]




5 (a) (right hand) no mark image laterally inverted (owtte) ; [1] (b) (i) electrical (energy) → sound (energy) [1] (ii) (frequencies lie) within human range 20 Hz to 20 000 Hz / (frequencies) are above 20 Hz and lower than 20 000 Hz ; [1] (c) (i) speed = distance / time ; speed = 25 / 40 = 0.625 / 0.63 ; metres / second / m / s ; [3] (ii) (100 N) (forces) are equal ; [1] (iii) one complete wavelength correctly marked and labelled ; [1] (iv) amplitude / frequency ; [1] (d)

X-rays

visible light

infra-red

microwaves

correct name ; correct box ; [2] [Total 11]




6 (a) (i) zygote / one of the ball of cells ; [1] (ii) fertilization ; [1] (b) to uterus / womb ; (implants / embeds) in wall / lining of uterus ; [2] (c) (i) vitamin D A A / B / E / K ; correct use of named vitamin ; [2] (d) 3.8 × 37 ; = 140.6 / 141 ; [2] [Total 8] 7 (a) darker in colour / gas to solid / increasing, mp / bp / density, down the group ; (must state trend and direction) [1] (b) (i) yellow / orange colouration ; [1] (ii) chlorine + potassium bromide → potassium chloride + bromine LHS ; RHS ; [2] (c) covalent ; [1] (d) makes water safe for consumption ; kills bacteria ; [2] [Total 7]




8 (a)

[2] (b) (i) more energetic water molecules escape into air ; remaining water has less (thermal) energy (so cooler) (owtte) ; [2] (ii) cooler water takes heat from air / water takes heat from warmer air ; [1] (c) allow space for (thermal) expansion ; [1] (d) (i) 30 × 15 × 10 = 4500 (cm3) ; [1] (ii) (density =) mass / volume / (d =) m / V ; d = 7500 / 4500 = 1.7 / 1.67 (g / cm3) ; (ecf) [2] [Total 9]

air

water

metal




9 (a)

[4] (b) right ; pulmonary artery ; valves ; [3] (c) (i) oxygen ; [1] (ii) glucose / sugar / amino acids / (any named) vitamin / (named) mineral / water /

carbon dioxide ;; [2] [Total: 10]

diagram function of cellname of cell

red bloodcell

white bloodcell

transport of oxygen;

defence against disease /phagocytosis;

This document consists of 19 printed pages and 1 blank page.

IB14 06_0653_61/FP © UCLES 2014 [Turn over

*8695980369*



Paper 6 Alternative to Practical May/June 2014

1 hour

Candidates answer on the Question paper.

No Additional Materials are required.


Write your Centre number, candidate number and name on all the work you hand in.

Write in dark blue or black pen.

You may use an HB pencil for any diagrams or graphs.



Answer all questions.


You may lose marks if you do not show your working or if you do not use appropriate units.

At the end of the examination, fasten all your work securely together.

The number of marks is given in brackets [ ] at the end of each question or part question.

2

© UCLES 2014 0653/61/M/J/14

1 A student is investigating the vitamin C content of a fruit juice. DCPIP is a dark blue chemical that is decolourised by vitamin C. A solution containing a higher

concentration of vitamin C will take fewer drops to decolourise DCPIP. The student is provided with a set of four standard solutions of vitamin C and a fruit juice of

unknown vitamin C content.

add dropsto well

DCPIP solution

spotting tilestandard solutionof vitamin Cor fruit juice

Fig. 1.1

• Using a dropping pipette, the student places two drops of DCPIP into each of five wells of a white spotting tile.

• She adds drops of the 0.25% vitamin C solution into one of the wells as shown in Fig. 1.1.

• She counts the number of drops needed to decolourise the DCPIP.

• She repeats the process for the remaining vitamin C solutions and the fruit juice.

• The results are shown in Table 1.1.

Table 1.1

concentration of vitamin C (%) number of drops needed to decolourise DCPIP

0.25 20

0.50 17

0.75 10

1.00 5

fruit juice 12

3


(a) Plot a graph of vitamin C concentration on the horizontal axis against number of drops needed to decolourise DCPIP.

Draw the best fit straight line.

[3] (b) Use your graph to estimate the concentration of the vitamin C content of the fruit juice and

mark on the graph how you worked this out.

vitamin C content = % [2]

(c) The student suggested that drops of distilled water are added to two drops of DCPIP in

another well. Give a reason why this further test should be used.

[1]

4

© UCLES 2014 0653/61/M/J/14

(d) Suggest two ways in which the experiment may be changed to give more accurate results.

1

2

[2] (e) Suggest one way to improve the reliability of this experiment.

[1]

(f) Vitamin C is an important component of our diet. What are the consequences of a diet that lacks vitamin C?

[1]

5



6

© UCLES 2014 0653/61/M/J/14

2 A student is investigating some reactions of sodium hydrogencarbonate, (NaHCO3) and sodium carbonate, (Na2CO3). They are both white powders.

(a) She places some sodium hydrogencarbonate in a test-tube and attaches a delivery tube. She

half fills a second test-tube with limewater and places the other end of the delivery tube into the limewater. She heats the first test-tube.

(i) Draw a labelled diagram of the apparatus. [2] (ii) She heats the test-tube of sodium hydrogencarbonate until there is no further change in

the limewater. Carbon dioxide is given off. Describe the two changes to the limewater.

[2]

(iii) The student also observes droplets of liquid in the delivery tube. Describe a test that will show that these droplets are water.

[1]

7


(b) The student makes a solution of sodium hydrogencarbonate by dissolving some of it in distilled water.

She divides the solution into two test-tubes. (i) To the first test-tube she adds a few drops of Universal (full range) Indicator solution.

Sodium hydrogencarbonate solution is slightly alkaline. Describe the colour change.

colour change to [1]

(ii) She adds a colourless liquid to the second test-tube. Bubbles of carbon dioxide are

given off. Suggest a name for the colourless liquid.

[1]

(c) She places some sodium carbonate in another test-tube and attaches a delivery tube. As in

part (a) she half fills a second test-tube with limewater and places the other end of the delivery tube into the limewater.

She heats the test-tube containing sodium carbonate and records her observations. (i) Suggest a difference between these observations and those made in (a)(ii).

[1]

She makes a solution of sodium carbonate by dissolving some of it in distilled water. She divides the solution into two test-tubes. (ii) To the first test-tube she adds a few drops of Universal Indicator solution. Sodium carbonate solution is more alkaline than sodium hydrogencarbonate. How does the final colour of the Universal Indicator differ from the colour seen in (b)(i)?

[1]

(iii) To the second test-tube she adds an equal volume of copper(II) sulfate solution. A blue precipitate is formed. Suggest the name of this precipitate.

[1]

8

© UCLES 2014 0653/61/M/J/14

3 A student is finding the density of plasticine (modelling clay). (a) She moulds the piece of plasticine into a block as shown in Fig. 3.1.

b

h

l

block of plasticine

Fig. 3.1 (i) Measure the length, (l), breadth, (b), and height, (h), of the arrows in Fig. 3.1 to the

nearest 0.1 cm and record your results below.

l = cm

b = cm

h = cm [3]

(ii) Calculate the volume of the block using the equation:

V = l × b × h

V = cm3 [1]

9


(b) The student sets up some apparatus as shown in Fig. 3.2.

50 g mass

block ofplasticine metre rulex

10.0 cmmark

50.0 cmmark

bench

0 100

knife edge

Fig. 3.2

A 50 g mass has been secured to the metre rule. Its position is fixed with its centre over the

10.0 cm mark. She takes the block of plasticine and places it on the metre rule. She moves it until the rule is just balanced with the knife edge directly under the 50.0 cm mark.

5 0 6 0 7 0 8 0

block of plasticine

Fig. 3.3 (i) Use Fig. 3.3 to find the distance, x, between the centre of the plasticine and the 50 cm

mark.

x = cm [1]

(ii) Calculate the mass, m, of the block of plasticine using the equation:

m = x

2000

m= g [1]

(iii) Calculate the density, d, of the plasticine using the equation:

d = V

m

d = g / cm3 [2]

10

© UCLES 2014 0653/61/M/J/14

(c) Suggest two reasons why the data you have used to calculate the density of plasticine may be inaccurate.

reason 1

reason 2

[2]

11



12

© UCLES 2014 0653/61/M/J/14

4 A student is studying cells using a light microscope. She prepares cells from an onion and stains them using iodine solution. Fig. 4.1 shows a group of onion cells as seen under the microscope.

cell A

Fig. 4.1 (a) Make a large pencil drawing of cell A in the box provided. Label the nucleus and cell wall.

[3]

13


The student wants to measure the average length of these cells. She places a ruler with a millimetre scale on the stage of the microscope to find the diameter of the field of view. She looks down the microscope and sees the field of view shown in Fig. 4.2.

mm

ruler

Fig. 4.2 (b) (i) Using the ruler in Fig. 4.2 state the width of the field of view of the microscope.

mm [1]

(ii) She then replaces her slide and counts 15 cells across the field of view. Calculate the average length of an onion cell using your answer from part (b)(i). Show your working.

average length of cell = mm [1]

(iii) On your drawing in part (a) measure the length of cell A at the longest part.

length of cell A on the drawing = mm [1]

(iv) Using the value for the average cell length from part (b)(ii) and the length of cell A on

your drawing, calculate the magnification of your drawing.

magnification = [2]

14

© UCLES 2014 0653/61/M/J/14

(c) Name one structure normally present in a plant cell that is not visible in these onion cells.

[1]

(d) Another student uses a microscope to look at some cells in iodine solution. Some parts of the

cell stain blue-black. Explain this observation.

[1]

15



16

© UCLES 2014 0653/61/M/J/14

5 (a) A student is investigating how the temperature changes as a hot liquid cools. He starts with some waxy solid in a test-tube and heats it until it melts. He removes the heat and takes the temperature of the liquid as it cools. He starts a stopclock and measures the temperature every minute for 10 minutes and

records the values in Table 5.1.

Table 5.1

time / min temperature / °C

0

1 74

2 69

3 69

4

5 55

6 42

7 32

8 28

9 22

10

(i) Read the thermometers in Fig. 5.1 which show the temperatures at 0, 4 and 10 minutes. Record the value in Table 5.1. [3]

90

80

70

°C

time = 0 min

70

60

50

°C

time = 4 min

30

20

10

°C

time = 10 min

Fig. 5.1

17


(ii) Use the grid provided to plot a graph of temperature (vertical axis) against time. Draw the best fit smooth curve.

[3] (iii) Use the graph to suggest a value for the melting point of the waxy solid.

°C [1]

(b) Describe the movement and arrangement of the molecules of the substance at

time = 1 minute,

movement

arrangement

time = 7 minutes.

movement

arrangement

[3]

18

© UCLES 2014 0653/61/M/J/14

6 (a) A student is investigating how the length of a wire affects its electrical resistance. (i) Name a piece of apparatus that can be used to measure

potential difference,

current. [2]

(ii) State the formula used to calculate the resistance of the wire using data obtained from

these two pieces of apparatus. [1] (iii) Draw a circuit diagram to show how the student would carry out the investigation.

Include the two pieces of apparatus you have named, the piece of wire and a power source.

[4]

19

© UCLES 2014 0653/61/M/J/14

(b) (i) Use the axes in Fig. 6.1 to sketch the line you would expect if resistance is plotted against length.

00 length of wire / cm

resistance / ......

Fig. 6.1 [2] (ii) State the unit for resistance.

unit = [1]

20

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

© UCLES 2014 0653/61/M/J/14

BLANK PAGE




0653 CO-ORDINATED SCIENCES

0653/61 Paper 6 (Alternative to Practical), maximum raw mark 60

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2014 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.




1 (a) axes labelled correctly and linear, names and % ;

all correct plots ± 0.5 square ; suitable straight line ; [3]

(b) line from number of drops of unknown shown on graph ;

correct reading from graph, minimum two decimal places ; [2] (c) a control / to see if water alone has an effect / AW ; [1] (d) (drops sizes vary so) use e.g. syringe ;

(difficult to judge end point (AW) so) do a titration ; alter concentration of DCPIP ; (not mixed properly so) use a stirring rod after each drop / stir ; constant temp ; [max 2]

(e) repeat / carry out the experiment more than once, AND calculate average, AND

look for consistency OR ignore outliers ; [1] (f) scurvy ;

poor healing of wounds ; loosening / loss of teeth ; [max 1]

[Total: 10] 2 (a) (i) correct diagram, must be heated ; [2]

two valid labels ;

(ii) limewater goes cloudy (etc.) ; then turns colourless / ppt dissolves / goes back to original ; (NOT clear) [2]

(iii) (anhydrous) copper sulfate / cobalt chloride ; (NOT temperature) [1] (b) (i) (green to) blue ; (allow green / blue, but NOT purple) [1] (ii) any (named) acid (allow correct formula) ; [1] (c) (i) no ppt / milky etc. no colour change ; (allow no gas forms / no bubbles, no

drops of water) [1] (ii) darker / dark blue / purple etc. ; [1] (iii) copper carbonate / CuCO3 (allow copper hydroxide) ; [1] [Total: 10]




3 (a) (i) 3.3 only ; 3.4 only ; 3.7 only ; [3]

(ii) 41.5(..) (ecf) must be rounded correctly ; [1] (b) (i) 19.(0) ; [1] (ii) 105.(..) (ecf) ; [1]

(iii) 41.5

105.(..)(ecf) ; [2]

2.5(….) ; (c) difficulty in making a block ;

difficulty in finding balance point ; difficulty in finding centre of block ; [max 2]

[Total: 10] 4 (a) good quality drawing of ONE complete cell only;

nucleus labelled correctly ; cell wall labelled correctly ; [3]

(b) (i) 6 mm ; [1]

(ii) 15

6= 0.4 mm ; (ecf) [1]

(iii) length taken from students drawing ; ± 2 mm [1]

(iv) magnification = 0.4

length ; (ecf)

= correct calculation ; (no ecf if fraction inverted) [2] (c) vacuole or chloroplast ; (NOT chlorophyll) [1] (d) starch (present) ; [1] [Total: 10]




5 (a) (i) 88 ; 69 ; 20 ; [3] (ii) axes correct and labelled name and unit ; [3]

points correct (allow 1 error) ; curve must include plateau at 69 ;

(iii) 69 only ; [1] (b) (movement) sliding / flowing etc.

(arrangement) random (movement) vibrate (arrangement) regular / ordered ;;; [max 3] awarding of marks 4 correct answers = 3 marks 2 correct comparisons = 2 marks (e.g. move less and become more regular) 1 correct comparison ) = 1 mark (e.g. move / vibrate less

[Total: 10]

6 (a) (i) voltmeter ; ammeter ; [2]

(ii) R =I

V (allow words or units) ; [1]

(iii) series circuit with a cell / power source ;

ammeter in series ; voltmeter in parallel ; wire under test ; [4]




(b) (i)

straight line, positive slope ; through origin ; [2]

(ii) Ω (allow ohm) (may be written on the axis label) ; [1] [Total: 10]

00 length of wire / cm

resistance / ......

Combined Science IGCSE Exam Academic year 2015-16

Documents

Transcript of Combined Science IGCSE Exam Academic year 2015-16