s.2 Chemistry Term II 2008

8/4/2019 s.2 Chemistry Term II 2008

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KAKIRA SECONDARY SCHOOL

END OF TERM II EXAMS YEAR 2008

S.2 CHEMISTRY

TIME: 1 HOURS.

NAME:----------------------------------------------------------------------

CLASS:--------------------

INSTRUCTIONS: Answer all questions in both sections

SECTION A: Put a ring around the correct answer.

1. Which of the following substances is a mixture ?

(a) Air (b) Water (c) Common salt D. Diamond

2. The chemical name of rust is -----------------------------------

A. Iron (II) Oxide B. Iron (III) Oxide C. hydrated Iron (III) oxideD. Iron rust.

3. ----------------------------- is the sum of the number of protons and neutrons in nucleus of atom.

A. Atomic number B. Atomic mass C. Valency D. covalence

4. Beginning with the least reactive, the order of the following metals in the series is

A. Aluminium, Zinc, Iron, lead. B. Iron, Zinc, Aluminium, lead.C, Zinc, lead, Iron, Aluminium D. Lead, Iron, Zinc, Aluminium

5. Metals react with dilute mineral acids to giveA. Oxide of the metal and hydrogen B. A salt of the metal and water

C. hydroxide of the metal and hydrogen. D. A salt of the metal and hydrogen

6. The Chemical symbol of phosphorous is

A. K. B. P. C. Hg D. Ph

7. Substance X ions accidentally left open in its container only to find after some days it isfound to have changed into a liquid solution. X underwent which process?

A. Distillation B. Deliquescence C. Efflorescence D. Hygroscopy

8. The correct formula of Aluminium sulphate is

A. Al2 (SO4)2 B. Al2SO4 C. Al2(SO4) 3 D. Al2SO3

9. When non-metals burn in oxygen they form

A. Substance B. Basic oxides C. Acidic Oxides D. Amphoteric oxide


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10. Which of the following groups of metals does not react with cold water?

A. Na, Ca, K, Mg. B. Mg, Ca, Na, Al C. Mg, Ca, Na, K D. Zn, K, Ca, Mg

11. All the following are properties of oxygen accept:

(i). its colourless (ii) Supports combustion (iii) its odourless (iv) Its poisonous

A. (i), (ii), (iii), only B. (iv) and (v) only C. (iv) only D. (ii) and (i) only

12. Which one of the following substances is deliquescent?

A. Calcium hydroxide B. Sodium hydroxide

C. Magnesium hydroxide D. Zinc hydroxide.

13. A steady hot flame of a Bunsen burner is obtained when

A. a lot of gas is burnt B. air holes are maximally openC. air holes are maximally closed D. None of these.

14. One danger of water pollution is that

A. The fish can die due to brain damage

B. Fish can die due to lead compounds from car exhaust.C. Fish can die due to lack of oxygen which is used by rotting algae.

D. Human beings can die because of eating a lot of fish.

15. A metallic bond is formed

A. when electrons are shared B. Between atoms of a metalC. when there is transfer of electrons D. when there is transfer of protons

16.Two elements X and Y have the following electron arrangement X 2:8:8:2 Y 2:8:1The formula of the compound between X and Y is

A. X2Y B. XY2 C. XY D. 2XY

17. Which one of the following is a correct reason for storing sodium under paraffin?

A. It becomes hard in air B. It shines in air C. It is easy to cutD. It reacts with oxygen in air.

18. Calcium metal was burnt in air and the product dissolved in water. The resultant solutionwhen tested with litmus paper changed to blue. This means the solution was

A. Acidic B. Neutral C. Alkaline D. Non of those


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19. Which one of the following is true about covalent compound?

They are usually said to be

A. Solids of high melting points B. soluble in water

C. non electrolytes D. crystalline

20. In the preparation of oxygen, potassium chlorate is heated with is heated with

A. Hydrogen peroxide B. Manganese IV oxideC. Sodium chloride crystals D. Potassium permanganate

SECTION B:

21. (a) State the conditions necessary for rusting to occur

(b) During an investigation to show the conditions under which an iron nail can rust, an

experiment was set up as below

(i) State the condition which was being eliminated

(ii) State two ways to prevent rusting

(c) (i) What is galvanized iron?

(iii) State two uses of galvanized iron


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22. The table below shows the composition of particles R,S,T,U and V

PARTICLES

SUBSTANCE PROTON ELECTRONS NEUTRONS

R 15 15 16S 12 10 12

T 15 18 14

U 17 17 18

V 8 8 8

a) Which substance (s)

(i) is/are an ion? -----------------------

(ii) is/are isotopic with R-------------------------

b) (i) write the electronic configuration of substance R

(ii) Write the simplest formula of the oxide of substance R.

c) (i) Which substance is from a metal?

(ii) Give a reason to support your answer

23. Oxygen can be prepared from hydrogen peroxide in the presence of a catalyst only.

(a) (i) Name the catalyst used.

(ii) Write the equation for the formation of oxygen


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(b) Name the process b which oxygen is

(i) used up from the atmosphere

(ii) replaced in the atmosphere.

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s.2 Chemistry Term II 2008