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Chemistry Form Three Question Paper

Chemistry Form Three

Course:Secondary Level

Exam Year:2010

FRIENDS SCHOOL GAVALAGI
CHEMISTRY FORM THREE C.A.T. 2

1. Element X has atomic number 20. State the group and period in which it belongs:

¡). Group......(1/2 mk)

¡¡). Period..... (1/2 mk)

2. Elements P and Q ( not actual symbols ) have atomic numbers 8 and 11 respectively. Write down the symbols of their ions C (1 mk)

3. The atomic number of element E is 6:

a). In which period of the periodic table is element E? Give a reason (2 mks)

b). Using dots ( . ) to represent electrons of element E and and crosses (X) to represent electrons of oxygen, draw the structure of the compound formed when E reacts with excess oxygen. (1 mk)

4. Element T belongs to period 3 and group V¡ of the periodic table.

a). Draw a diagram to show the electronic structure of element T. (1 mk)

b). Determine its atomic number. (1 mk)

5. Use the information in the table to answer the questions that follow.

ELEMENTS ATOMIC RADIUS (NM)

Lithium 0.123

Sodium 0.157

Potassium 0. 203

a). What name is given to elements in the table. (1 mk)

b. (¡). What is meant by ionisation energy. (1 mk)

(¡¡). Explain why the ionisation energy of Potassium is lower than that of Sodium. (1 mk)

c). State three uses of the elements in the table. (3 mks)

6. Hydrogen ( atomic number 1 ) can form two types of ions. Write equations for the formation of the two ions. (2 mks)

7. Elements X is in period 2 of the periodic table, and forms a stable ion, X;

a). State the atomic number of elements Y which is directly below X in the periodic table. (1 mk)

b). Compare the reactivity of X and Y with Chlorine. (2 mks)

8. In terms of bonding and structures, explain why metals are good conductors of electricity. ( 1 mk )

9. State the type of structure formed when ;

a). Potassium combines with flourine. (1 mK)

b). Nitrogen combines with hydrogen. (1 mk)

c). Carbon atoms combine using all the four valency electrons. (1 mk)

10. Element W whose atomic number is 12 and Y, atomic number 7, combine to form a compound. Give three properties of compound formed. (3 mks)

11. Diamond and graphite are two allotropes of carbon. Explain why;

a). Graphite conducts an electric current and not diamond. (1 mk)

b). Diamond has a higher density than graphite. (1 mk)

c). Graphite is used as a lubricant. (1 mk)

12. The table below gives the atomic numbers of some elements.

ELEMENT ATOMIC NUMBER

P 1

Q 7

R 11

S 17

a). Identify two elements which will combine to give :

¡). An ionic compound (1 mk)

¡¡). A covalent molecule (1 mk)

b). Using dots ( . ) and crosses ( X ) show bonding in element Q. (1 mk)

13. 200 cm3 of Carbon (¡¡) Oxide were burnt in 80 cm3 of oxygen and the mixture allowed to attain the original room temperature and pressure.

a). Write an equation for the reaction. (1 m

Chemistry Form Three Question Paper

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