Modul Hikmah 7

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SCIENCE SPM

MODULE 7

PAPER 1

1 Which of the following is an alloy?A GoldB SilverC PewterD Copper

2 Which of the following correctly describes the arrangement of puremetallic particles?A OrderlyB Loosely packedC Unevenly spreadD Difficult to slide over

3 Does not rust Hard, durable and shiny Contains 75% copper and 25% nickel

The properties of alloy P are listed above. Alloy P can be used to makeA carsB coinsC bridgesD aeroplane windows

4 Pure gold is too soft and ductile to be made into anything useful. Howcan the gold be hardened?

A Melt the gold and add in other elements.B Melt and remould the gold repeatedly.C Hammer it repeatedly.D Add more gold to it.

5

A student sets up the apparatus in the figure above to study the rustingprocess. What would be observed at the end of the experiment?A Both the nails inside test tubes A and B rusted.B Both the nails inside the two test tubes did not rust.C The nail inside test tube A rusted but not the nail inside test tube

B .D The nail inside test tube A did not rust but the nail inside test tube

B rusted.


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6

condition Y Nitrogen + gas X > ammonia

The word equation above represents the process of producing ammoniaindustrially. What are gas X and condition Y ?

Gas X Condition Y A Oxygen 200 atm, 200CB Hydrogen 200 atm, 500CC Oxygen 20 atm, 50CD Hydrogen 500 atm, 200C

7 Which of the following is involved in the formation of acid rain?A AmmoniaB Carbon dioxideC Nitrogen dioxide

D Carbon monoxide8 What method can be used to filter the coal ashes in the smoke released

from the chimney of a factory?A Electrostatic precipitatorB Air cleaning systemC Anaerobic digesterD Direct burning

9 The greenhouse effect is the result of the trapping of heat in theatmosphere byA oxygenB nitrogenC carbon dioxideD sulphur dioxide

10 Which of the following methods can be used to dispose of radioactivewastes?A Using storage tank made from strontiumB Using electrostatic comparatorC Using a digestive tankD Using a burner


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PAPER 2SECTION A + B

Q 1. The below diagram X and Y show the structures of an alloy and a pure metal.

(a) Which diagram shows the structure of(i) a pure metal?

[1 mark]

(ii) an alloy?

[1 mark]

(b) Alloys are harder and stronger than pure metals. Explain.

[1 mark]

(c) (i) Name an alloy that can be formed from copper, antimony and tin.

[1 mark ](ii) What are the compositions of the alloy?

[1 mark]

(iii) State two uses of the alloy.

[1 mark]


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Q 2. The diagram below shows an experiment carried out to compare the formation of rustby pure iron and an alloy of iron.

(a) Predict the observation of both types of iron nails after three days.

[ 1 mark]

(b) Write down one inference can be made based on your answer in (a)?

[1 mark]

(c) State the variables of the experiment.(i) Manipulated variable:

[1 mark]

(ii) Responding variable:

[1 mark]

(iii) Constant variable:

[1 mark]

(d) What inference can be made from the experiment?

[1 mark]


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Q 3. The diagram below shows an experiment carried out to compare the hardness of analloy with a pure metal.

The table below shows the result of theexperiment obtained.Depth of dent (cm)

Block 1 2 3 AverageCoppe

r1.6 1.4 1.5

Bronze 1.1 1.2 1.0

(a) Complete the above table.[2 marks ]

(b) State the relationship between the depth of dent and the hardness of thematerial tested.

[1 mark]

(c) Based on the experiment results, which block is harder?

[1 mark]

(d) State the composition of bronze.

[1 mark]


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(e) Draw pattern formed by the constituent atoms for copper and bronze.

Copper Bronze[1 mark]

Q 4. The diagram below shows the Haber Process which is used to produce ammoniaindustrially.

(a) State the process which can be used to obtain:(i) nitrogen gas

[1 mark]

(ii) hydrogen gas

[1 mark]

(b) Predict what happens to the mixture of hydrogen and nitrogen in X?

[1 mark]


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(c) The mixture of hydrogen and nitrogen gases must be compressed beforereacting. Explain.

[1 mark]

(d) State the reacting conditions in the Haber Process.Temperature:Pressure:Catalyst:

[3 marks ]

(e) What is the function of the catalyst in the reaction to produce ammonia?

[1 mark]

SECTION C

1. Study the following statement

An alloy is more resistant to corrosion than a pure metal.

You are provided with an iron nail, a stainless steel nail and common saltsolution.(a) Suggest a hypothesis to investigate the above statement.(b) Describe an experiment to test your hypothesis. Your description should

include the following criteria(i) Aim of the experiment(ii) Identification of variables(iii) List of apparatus and materials(iv) Procedure or method(v) Tabulation of data


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MODULE 7 - ANSWERS

PAPER 1

1. C 2. A 3. B 4. A 5. C 6. B 7. C 8. A 9. C 10. A

PAPER 2SECTION A + BQ 1.a)(i) Diagram Y

(ii) Diagram Xb) The atoms of the second metal prevents the layers of sliding atoms in the first metalfrom sliding over each other easily.c)(i) Pewter

(ii) 96 % tin, 3 % copper and 1 % antimony.

(iii) For making drinking mugs and vases. To make ornaments.Q 2. a) The iron nails became brown in colour while there was no change to the steelnails.b) The iron nails turned rusty whole the steel nail did not.c)(i) Type of nail

(ii) Condition of the nails after three days(iii) Sodium chloride solution/ test tube.

d) Alloys can prevent corrosion or rustingQ 3.a) Copper:1.5 cm, Bronze:1.1cmb) The softer the tested material, the deeper the dent is.c) Bronze

d) Copper and tine)

Q

Q 4.a)(i) Nitrogen gas-Fractional distillation of liquified in X.

(ii) Hydrogen gas-Processing natural gasb) The mixture will be dried and purified in X.c) To achieve higher pressure. More ammonia gas is produced at a higher temperature.d) Temperature:450-500 0C

Pressure:200 atmosphereCatalyst: Iron powder

e) To speed up the reaction rate during the production of ammonia


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SECTION C

(a) The presence of another metallic element in a metal increase thecorrosion resistance.

(b) (i) Aim : To compare the corrosion resistance between an alloy and an iron(ii) Manipulated variable type of nail

Responding variable - the rate of corrosionFixed variable - volume and concentration of sodium chloride

(iii) Apparatus and material : Iron nail, stainless steel nail, sodium chlorideSolution, test tube.

(iv) Procedure :1. An iron nail and a stainless steel nail are cleaned with a sand

paper and rinsed with distilled water2. The nails are put in two test tubes3. 10 cm of dilute sodium chloride solution are placed into each

test tube4. After 3 days, the observation on the nails are recorded

(v) Tabulation of data

Type ofnail

Observation Inference (Rusting / Not rusting)

Iron nailSteel nail

Modul Hikmah 7

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