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Chemistry Question Paper

Chemistry

Course:Secondary Level

Exam Year:2012

1. Name the process that takes place when
(i) Fat or oils are hydrolyzed using an alkali. (1 mk)
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(ii) Sulphur is heated with natural rubber. (1 mk)
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2. When anhydrous Calcium Chloride is exposed to the atmosphere. It forms a solution.
(a) Name the process that takes place. (1 mk)
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(b) State one use of the process named in 2 (a) above. (1 mk)
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3. Study the energy level diagram for the reaction shown below and use it to answer the questions that follow.

(i) State and explain two ways of increasing the yield of SO3 per unit time from the diagram.
(2 mks)
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(ii) What do the following represent?
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4. The diagram below shows an incomplete set-up of preparation and collect of dry hydrogen chloride gas. Use it to answer the questions that follow.

(a) Identify solid M and liquid P.
M ……………………………………………………………………………………….
P ………………………………………………………………………………………..
(b) Complete the diagram above to show how the preparation and collection was achieved.
(1 mk)
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5. Give the reaction type of the following:
(i) Reaction between Butan – 1-oic acid and Pentan – 1- ol in the presence of drops of conc. Sulphuric acid to form an organic compound. (1 mk)
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(ii) Reaction between Chlorine and Potassium Iodide to form a dark brown solution. (1 mk)
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(iii) Reaction between bromine and methane in the presence of U.V light (1 mk)
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6.

6. A fossil was discovered in the year 2007. Its half-life was found to be 440 yrs. Calculate the time
it will take for the mass of the fossil to have reduced from 240g to 15g. (3 mks)

7. A form four student accidentally mixed Sodium Carbonate and Calcium Carbonate. Describe how he would obtain a dry sample of Sodium Carbonate from the mixture. (3 mks)
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8. State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen. (1 mk)

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