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Form 3 Chemistry Question Paper

Form 3 Chemistry

Course:Chemistry

Exam Year:2012

ST. BERNARD SECONDARY SCHOOL
END OF TERM 1 EXAMINATION 2012
FORM III
CHEMISTRY
1. Give two uses of group (VII) elements. (2mks)

2. The reactivity of metals increases down the group. Explain why. (2mks)

3. Calculate the number of moles of 0.25 M, Sulphuric acid given the volume of 400CM3. (3mks)

4. 0.1 moles of a metallic sulphate MSO4 combines with 5.4g of water to form a hydrated salt MSO4. XH2O.Determine the value of x in the formula MSO4. XH20. (3mks)

5. When excess magnesium powder was added to iron (II) sulphate solution the pale green colour of the solution faded.
a) Write a word and a balanced chemical equation of the reaction. (2mks)
b) From the chemical equation write the ionic equation of the reaction. (2mks)

6. Name the elements present in the following compounds.
i) Nitrogen sulphute. (2mks)
ii) Hypochlorous acid ( a mixture of hydrochloride and chlorous (i) acid (3mks)

7. Give the apparatus used to measure.
a) Temperature (1mk)
b) Mass (1mk)

8. What is valance? (1mk)

9. A compound of carbon and hydrogen is made up of 5.28g of carbon and 0.66g of oxygen. Calculate its empirical formula. (4mks)

10. Use the table below to answer the questions that follows.
Element Electron arrangement Atomic radius Ionic radius
K 2.8.2 0.136 0.065
L 2.8.7 0.099 0.181
M 2.8.8.1 0.203 0.131
N 2.8.8.2 0.174 0.099

a) Which two elements have similar chemical properties?
Explain (2mks)
b) What is the most likely formula of oxide of k? (2mks)
c) Which element is a non – metal? Explain (2mks)
d) Explain why the ionic radius of N is a less than its atomic radius. (2mks)
e) Compare the reactivity of K and N. Give reasons for your answer. (2mks)

11. Differentiate between a strong acid and a weak acid. (2mks)

12. a) State Graham’s law of diffusion. (2mks)
b) Explain why hydrogen chloride gas diffuses slower than ammonia (H=I, CL = 35.5, N=14) (3mks)

13. At a temperature of 37oC and a pressure of 760mmHg a gas occupies a volume of 30dm3. What is the temperature on oC at which the volume is 60dm3 and the pressure is 540mmHg? (5mks)

14. Give three apparatus used in titration. (3mks)

15. Define the term volumetric analysis. (2mks)

16. State Charles law. (2mks)

17. Describe an experiment that can be used to prepare hydrogen gas. (4mks)

18. The valency of metal x is 2. Write the formula of
a) Carbonate of x (carbonate = CO32-) (2mks)
b) Hydroxide of x (hydroxide – OH-) (2mks)

19. Explain why non-metals do not conduct electricity. (3mks)

20. Give three physical properties of alkaline earth metals. (3mks)

Form 3 Chemistry Question Paper

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