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Chemistry Form Two Question Paper

Chemistry Form Two

Course:Secondary Level

Exam Year:2012

KIERENI SECONDARY SCHOOL
P.O BOX 419 CHUKA
END OF MAY EXAM FORM TWO CHEMISTRY

1. Name two factors that accelerate rusting. (2mks)
2. Sodium chloride was found to be contaminated with copper(II) oxide. Describe how a sample of sodium chloride can be separated from the mixture. (3mks)

3. Distinguish between mass number and atomic number. (3mks)

4. An isotope Q has a mass number of 34 and 18 neutrons.
i. Draw the atomic structure of Q. (2mks)
ii. Write its electronic configuration. (2mks)
iii. To which period and group does Q belong? (2mks)
iv. How does Q form its ions? (3mks)

5. The valency of metal Y is 2. What is the formulae of
a. Carbonates
b. Sulphates
c. Hydroxides

6. Write and balance the following equations:
i. The reaction of magnesium and dilute hydrochloric acid
ii. Reaction of sodium hydroxide and dilute sulphuric acid
iii. The action of calcium metal on water.
iv. Heating sodium metal in excess air.
(8mks)

7.
a. State the differences between an alkali metal and alkaline earth metal. (2mks)
b. Give an example in each case. (2mks)

8. Briefly explain the following:
i. The atomic radii of both alkali and alkaline earth metals increases down the group. (2mks)
ii. Generally metals react by losing the outermost electrons while non-metals react by gaining electrons in the outermost energy level. Explain. (2mks)
iii. Give three uses of alkali metals. (3mks)

9. Write a well balanced equation for the reaction between potassium metal and chlorine gas. (2mks)

10. Explain the following:
a. Magnesium and calcium are good conductors of heat and electricity. (2mks)
b. 2nd ionization energy is higher than 1st ionization energy in magnesium. (2mks)

11. How many atoms are present in each of the following:
i. Zinc chloride. (1mk)
ii. Calcium chloride. (1mk)

12. Write a balanced equation for the reaction between:
a. Magnesium and air. (2mks)
b. Sodium and water. (2mks)

Chemistry Form Two Question Paper

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