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Name: __________________________________ Class: _______________

ASJA Boys’ College Charlieville

End of term examinations

March 2014.

FORM 3

Chemistry

3FM/3SAH/3ZE/3RA/3HA

Time – 1 hour 30 minutes

Instructions to candidates:

1. Do not open this question paper until you are told to do so by the exam supervisor.

2. Once opened, check to ensure that you have all printed pages and questions.

3. This paper consists of TWO sections; Section A and Section B, answer all questions from each section.

4. Shade the appropriate responses to section A on the answer sheet provided. If you are not provided

with an answer sheet, kindly raise your hand and indicate this to your EXAM SUPERVISOR.

5. Write your answers to section B in the spaces provided on this paper.

6. The use of scientific calculators is permitted for this examination.

7. If you finish before time is up, check over your work.

Page | 1

Section A

1. Which of the following reactions involves

the chemical change where two elements

are combined to form one compound?

(a) zinc + sulphur ==> zinc sulphide

(b) oxygen + copper sulphide ==> copper

sulphate

(c) carbon dioxide + calcium hydroxide ==>

calcium carbonate + water

(d) water ==> hydrogen + oxygen

2. Which of the following is the chemical

symbol for the element magnesium?

(a) Mg

(b) Po

(c) P

(d) K

3. Which element is a liquid metal at room

temperature?

(a) mercury

(b) oxygen

(c) iron

(d) Sulphur

4. Which picture represents single atoms and

diatomic molecules?

(a)

(b)

(c)

(d)

5. Which of the following reactions involves

the chemical change: compound

decomposes to form two elements?

(a) water ==> hydrogen + oxygen

(b) oxygen + copper sulphide ==> copper

sulphate

(c) zinc + sulphur ==> zinc sulphide

(d) carbon dioxide + calcium hydroxide ==>

calcium carbonate + water

6. Which of these is a compound?

(a) H2O

(b) Ca

(c) Fe

(d) Co

7. Which word means the 'smallest particle of a

substance'?

(a) atom

(b) molecule

(c) formula

(d) symbol

8. Which statement is USUALLY FALSE

when comparing the physical properties of

metallic and non-metallic elements?

(a) metals have low densities

(b) metals are good conductors of electricity

(c) non-metals are poor conductors of heat

(d) non-metals have low melting and boiling

points

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9. Which word means 'a summary of the

number of atoms of each element in a

compound'?

(a) formula

(b) atom

(c) molecule

(d) symbol

10. Which of these words means 'one type of

atom only'?

(a) element

(b) reactant

(c) product

(d) Compound

11. Lemon juice is an acid and bleach is an

alkali. Which statement is TRUE?

(a) blue litmus turns red in bleach

(b) blue litmus stays blue in lemon juice

(c) blue litmus turns red in lemon juice

(d) red litmus stays red in bleach

12. Which of the following 'fizzes' when acid is

added to it?

(a) cooking salt

(b) potato chips

(c) baking powder

(d) household ammonia

13. A lake is found to be too acidic to allow fish

to live. Which substance could be added to

the water reduce the acidity in the lake?

(a) water

(b) charcoal

(c) sodium hydroxide

(d) hydrochloric acid

14. Which statement is most likely to be TRUE?

(a) sodium hydroxide is a harmless weak

alkali

(b) sodium bicarbonate is a weak harmless

acid

(c) sulphuric acid is a corrosive acid

(d) vinegar is a potentially harmful strong

acid

15. A student tested some solutions with

universal indicator to see whether they were

acid, alkaline or neutral. The resulting

colours were as follows:

Solution U – violet

Solution V – orange

Solution W - green

Solution X – blue

Solution Y – red

Solution Z - yellow

Which solution was neutral?

(a) only solutions U and X

(b) only solutions Y and Z

(c) only solutions W

(d) only solution V

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16. Which is the weakest alkali?

(a) vinegar

(b) wine

(c) limewater

(d) baking soda

17. Which of the following is the pH of a weak

alkali?

(a) pH 1

(b) pH 5

(c) pH 8

(d) pH 14

18. Which of the following is the pH of a strong

acid?

(a) pH 14

(b) pH 9

(c) pH 1

(d) pH 5

19. Which word matches the following hazard

warning description ... 'may make you ill if

swallowed, breathed in or absorbed through

the skin'?

(a) irritant

(b) corrosive

(c) harmful

(d) Explosive

20. A chemical company accidently spill a

substance into a local stream that feeds into

a trout fishing river. Which of the following

possible spilled chemicals would cause the

most immediate harm to aquatic river life?

(a) potassium phosphate for fertilisers

(b) sodium chloride salt for de-icing roads

(c) sulphuric acid for car batteries

(d) sodium hydrogen carbonate for antacid

indigestion tablets

21. Which element reacts with hydrochloric acid

to give a colourless gas and a colourless

solution?

(a) copper

(b) magnesium

(c) sulphur

(d) oxygen

22. In which reaction is a non-metal oxidised?

(a) hydrogen + lead oxide ==> lead + water

(b) carbon + oxygen ==> carbon dioxide

(c) magnesium + water (steam) ==>

magnesium oxide + hydrogen

(d) copper oxide + carbon ==> copper +

carbon dioxide

23. Which two words apply to the substance

mercury?

(a) solid, element

(b) liquid, element

(c) gas, mixture

(d) liquid, mixture

Page | 4

24. When some sodium hydroxide crystals is

dissolved in plenty of water, which

statement is most likely TRUE about the

resulting solution?

(a) the boiling point is lower than pure

water

(b) the solution becomes very alkaline

(c) the freezing point is lower than pure

water

(d) the boiling point decreases the longer the

solution is boiled

25. A variety of observations can indicate

whether or not a chemical reaction is

happening when chemicals are mixed.

Which of the following is most likely to

indicate a chemical change when an acid is

mixed with an alkali with litmus paper in it?

(a) no precipitate forms (a solid forming out

of mixing solutions)

(b) there is a colour change

(c) the mixture does not change temperature

(d) no gas bubbles form

26. The best way to determine if a chemical

change occurred is to

(a) Look for a precipitate

(b) Look for a temperature change

(c) Look for bubbles

(d) Look for a change in state

27. An acid will always

(a) Make red litmus blue

(b) Make blue litmus red

(c) Make blue litmus blue

(d) None of the above

28. A base will always

(a) Make red litmus red

(b) Make red litmus blue

(c) Make blue litmus red

(d) None of the above

29. An acid has a basicity of ONE, an example

of this acid is

(a) Sulphuric acid

(b) Hydrochloric acid

(c) Phosphoric acid

(d) Carbonic acid

30. A basic substance that is commonly found at

home is

(a) Sodium Chloride

(b) Bleach

(c) Vinegar

(d) Water

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31. When an egg is placed in a beaker

containing sulphuric acid, the shell slowly

disappears. This change can be classified as

(a) A mystery

(b) A physical change

(c) A chemical change

(d) None of the above

32. When phosphoric acid (H3PO4) dissociates

in aqueous solution, the basicity will be

(a) 1

(b) 2

(c) 3

(d) 4

33. The use of an indicator solution helps us to

(a) Make chemistry exciting

(b) Make solutions colourful

(c) Determine the pH of a solution

(d) Determine the solubility of the indicator

34. A sodium atom has an atomic number of 11

and atomic mass of 23. Which statement

about this atom is TRUE?

(a) The atom has 12 protons

(b) The atom has 12 electrons

(c) The atom has 12 neutrons

(d) The atom has 12 shells

35. Water is made up of Hydrogen and Oxygen

atoms. The location of these elements in the

periodic table will be:

(a) Group 2 and 6

(b) Group 6 and 8

(c) Group 1 and 6

(d) Group 3 and 5

36. One property of carbon atoms that resembles

a metal is

(a) Its ability to conduct electricity

(b) Its high melting point

(c) Its high density

(d) Its colour

37. Sodium Chloride crystals that are dissolved

in water can conduct electricity. This

happens because of

(a) The ions are separated and mobile

(b) The ions are fused together

(c) The atoms are separated

(d) The atoms are fused together

38. Which compound below contains ionic

bonding?

(a) Potassium Hydroxide

(b) Ammonia

(c) Carbon Dioxide

(d) Water

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39. Which of the following will you find having

a covalent bond?

(a) Chlorine gas

(b) Sodium chloride

(c) Sodium atoms

(d) None of the above

40. Metals are able to conduct heat and

electricity due to the presence of

(a) Free mobile electrons

(b) Free mobile protons

(c) Free mobile neutrons

(d) Free mobile atoms

1 mark each x 40

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Section B

1. Complete the following chemical equations by filling in the symbol of the missing chemical and

balancing the equation.

(a) Mg(s) + __________________ ===> MgCl2(aq) + H2(g)

(b) ZnO(s) + H2SO4(aq) ===> _________________ + H2O(l)

(c) __________________ + 2HNO3(aq) ===> Ca(NO3)2(aq) + H2O(l)

(d) CuCO3(s) + H2SO4(aq) ===> __________________ + H2O(l) + CO2

(e) __________________ + 2HCl(aq) ===> CaCl2(aq) + 2H2O(l)

(f) Zn(s) + __________________ ===> ZnSO4(aq) + H2(g)

(g) __________________ + HNO3(aq) ===> NH4NO3(aq)

(h) CuO(s) + 2HCl(aq) ===> __________________ + H2O(l)

(i) __________________ + 2HCl(aq) ===> MgCl2(aq) + H2O(l) + __________________

10 marks

2. Complete the following note about atoms by filling in the appropriate word(s) in the blank spaces.

Atoms are made of_____________ fundamental particles called protons (+), ___________ (0)

and____________ (-). The centre of the atom is called the ________________. It consists of protons

and _____________ and contains most of the mass of the atom. The number of protons in the atom is

called the _____________ number. It also equals the number of_____________ in a neutral atom. The

________________________ is the sum of the protons and neutrons in the nucleus. An atom of mass

number 43, and atomic number 21, consists of twenty one protons, _______________neutrons and

______________electrons. 10 marks

3. Using the atomic symbols or formulae: K, Br, KBr and HBr; explain the meaning of the terms

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(a) Atom

_________________________________________________________________________________

_________________________________________________________________________________

(b) Element

_________________________________________________________________________________

_________________________________________________________________________________

(c) Compound

_________________________________________________________________________________

_________________________________________________________________________________

(d) Ionic bonding

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

(e) Covalent bonding

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

10 marks

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4. Write down the chemical formulas for the following ionic and molecular compounds.

(a) Magnesium Chloride _____________________

(b) Sodium Carbonate _____________________

(c) Iron (III) Hydroxide _____________________

(d) Lithium Iodide _____________________

(e) Carbon Monoxide _____________________

(f) Calcium Fluoride _____________________

(g) Oxygen gas _____________________

(h) Potassium Chloride _____________________

(i) Water _____________________

(j) Potassium sulphate _____________________

10 marks

5. (a) Distinguish between a physical and a chemical change.

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

(b) Describe what takes place in a decomposition reaction.

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

4 marks

(c) List TWO examples of synthesis reactions.

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

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(d) List TWO examples of REDOX reactions.

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

Total 10 marks

6. (a) Define the terms acid and base.

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

(b) List two physical properties of acids.

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

(c) List two physical properties of bases.

____________________________________________________________________________________

____________________________________________________________________________________

2 marks

(d) Explain what is meant by the strength of an acid or base.

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

3 marks

(e) State the importance of using indicators with acids and bases.

_________________________________________________________________________________

_________________________________________________________________________________

1 mark

Total 10 marks

Grand Total 100 marks

END OF EXAM

Enjoy your vacation

Mr. Siddeek Ali