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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.
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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
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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
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(b) Element
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(c) Compound
_________________________________________________________________________________
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(d) Ionic bonding
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(e) Covalent bonding
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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.
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2 marks
(b) Describe what takes place in a decomposition reaction.
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4 marks
(c) List TWO examples of synthesis reactions.
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2 marks
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(d) List TWO examples of REDOX reactions.
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2 marks
Total 10 marks
6. (a) Define the terms acid and base.
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2 marks
(b) List two physical properties of acids.
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2 marks
(c) List two physical properties of bases.
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2 marks
(d) Explain what is meant by the strength of an acid or base.
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3 marks
(e) State the importance of using indicators with acids and bases.
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1 mark
Total 10 marks
Grand Total 100 marks
END OF EXAM
Enjoy your vacation
Mr. Siddeek Ali