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Chemistry Form Three Paper 1 Question Paper

Chemistry Form Three Paper 1

Course:Secondary Level

Exam Year:2010

IDELERI SECONDARY SCHOOL
CHEMISTRY FORM THREE PAPER 1 TERM 3

1. An element has electronic arrangement 2 . 8 . 18 . 7

(a). What is the atomic number of this element. (1 mk)

(b). To which group and period of the periodic table does the element belong? (2 mks)

2. Give a chemical explanation for each of the following;

(¡). Hydrogen diffuses faster than oxygen. (1 mk)

(¡¡). A crystal of potassium permanganate if left in water gives purple solution after some time. (1 mk)

3. 3.18g of a monovalent metal 'N' reacted with excess hydrochloric acid to produce 672 cm3 of hydrogen at s.t.p. Determine the R.A.M of 'N'. (3 mks)

4. State and explain the observations made when hydrogen sulphate gas is passed through a solution of Iron (¡¡¡) chloride. (2 mks)

5. Equal volume of oxygen and gas D took 20 seconds respectively to diffuse through the same hole under the same conditions. Find the relative molecular mass of D. (3 mks)

6. When magnesium metal is burned in air, it reacts with both oxygen and nitrogen gases, giving a white ash. Write two equations for the reactions that take place. (2 mks)

7. A fixed mass of a gas has a volume of 250 cm3 at a temperature of 27° C and 750mmHg pressure. Calculate the volume the gas would occupy at 42° C and 760 mmHg.

8. State with equation why ammonia molecules can react with hydrogen ion to form ammonium ion. (2 mks)

9. What mass of Lead Iodide would be produced from reacting 3.32g of potassium iodide and excess Lead nitrate? (Pb = 207, L = 127, K = 39)

10 a). What is the name given to a solid substance which absorbs water vapour but does not form a liquid on exposure to air? (1 mk)

b). Oxygen and Nitrogen are obtained by fractional distillation of air. Give three reasons why the method cannot be used to obtain oxygen and hydrogen fro air. (3 mks)

11. Explain why dry ice is a better refrigerant than ordinary ice. (3 mks)

12. 4.76g of liquid nitrogen and 4.76g of liquid ammonia were each allowed to warm up and change into gas at r.t.p. Explain which gas occupied the greatest volume. (H = 1, N = 14) (3 mks)

13. (a). What is electrolyte, (1 mk)

(b). State how the following substances conduct electricity;

¡). Molten calcium chloride (1 mk)

¡¡). Graphite (1 mk)

14. With the help of equation, show what happens when chlorine water is exposed to sunlight. (2 mks)

15. Define the following terms

(a). Atomicity (1 mk)

(b). Molar gas volume (2 mk)

Chemistry Form Three Paper 1 Question Paper

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