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Chemistry Paper 1 Question Paper

Chemistry Paper 1

Course:Secondary Level

Exam Year:2012

CHEMISTRY
PAPER 1
June / July 2012

KIBUGAMU TWO JOINT EXAMINATION
Kenya Certificate of Secondary Education (KCSE)

1. Classify the following processes as either physical or chemical change:-

¡). Heating of copper (¡¡) nitrate solid (1 mk)

¡¡). Obtaining kerosene from crude oil (1 mk)

2. (a). What are Isotopes? (1 mk)

b). Determine the relative atomic mass of Neon. If Neon - 20 forms 90.92%, Neon - 21 forms 0.26% and Neon-22 forms 8.82% of total mass of a given sample of neon gas. (2 mks)

3. Give two properties of air that make it a mixture and not a compound. (2 mks)

4. Draw the structural formulae of the following compounds:-

¡). Ethane

¡¡). Ethanol

5. Calcium oxide is added to soil in certain areas. State the purpose (1 mk)

6. Starting with Lead (¡¡) oxide solid describe how would prepare a solid sample of Lead (¡¡) chloride given the following:-

a). Sodium chloride solid

b). Dilute nitric (v) acid

c). Distilled water. (3 mks)

7. Name the crystalline forms of carbon. (1 mk)

8. (a). Explain observation made when a moist litmus paper is dropped into a test tube containing sulphur (¡v) oxide gas. (1 mk)

b). Write and equation for the reaction between sulphur (¡v) oxide and water. (1 mk)

9. (a). Write the chemical equation to show the reaction between Aluminium oxide and the following substances;

¡). Sodium hydroxide (1 mk)

¡¡). Dilute hydrochloric acid. (1 mk)

b). State the proper of Aluminium oxide demonstrated above. (1 mk)

10. (a). Give two reasons why a Bunsen burner is used in heating and not a candle. (1 mk)

b). Suggest why an electric heater is not suitable for use in a chemist lab for general laboratory experiments. (1 mk)

11. Sulphur (¡v) oxide reacts with potassium chromate (v¡) according to the equation below;

3SO2 (g) + Cr2O7 (aq) + 2H(aq)----------3SO4 (aq) + 2Cr (aq) + H2O (l)

(¡). What is the oxidation numb of chromiuum ion in Cr2O7 (1 mk)

12. When solid magnesium carbonate was added to a solution of hydrogen chloride in methylbenzene, there was no apparent reaction. On addition of water to the resulting mixture, there was effervescence. Explain this observation. (2 mks)

13. Dry hydrogen gas reacts with heated copper (¡¡) oxide as shown in the equation below.

CuO (s) + H2 (gas)----------------- Cu (s) + H2O (g)

a). Name the process undergone by the copper (¡¡) oxide. (1 mk)

b). State one use of hydrogen based on its density. (1 mk)

14). State one gas which can be used in place of hydrogen as indicated by the question above. (1 mk)

15). Give two properties of carbon (¡v) oxide that is suitable for use in fire extinguishers. (2 mks)

16. A reddish brown halogen B was bubbled through a colourless solution containing ions of another halogen C. The solution turned dark red after a short while.

a). Identify halogen C (1 mk)

b). Write an ionic equation for the reaction that takes place above using actual symbols of B and C. (1 mk)

Chemistry Paper 1 Question Paper

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