1 In terms of structure and bonding, explain why graphite is used as a lubricant in machines (3 marks) 2 Element U has atomic number 12 while element V has atomic number 16 How do the melting points of their oxides compare Explain (3 marks) 3 Table 1 shows the properties of two chlorides, D and E Chloride Melting Points(C) Electrical Conductivity(liquid) D 1074 Good E 203 Poor (a) State the type of bond present in (i) D (1 mark) (ii) E (1 mark) (b) Explain in terms of structure and bonding, the difference in electrical activity of the chlorides D and E (1 mark) lonic band NaCl O TYPES OF CHEMICAL BONDS Metallic bond metallic sodium Na Na Covalent bond H2 Hydrogen bond solid HO

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Question: 1. In terms of structure and bonding, explain why graphite is used as a lubricant in machines. (3 marks) 2. Element U has atomic number

1. In terms of structure and bonding, explain why graphite is used as a lubricant in machines. (3 marks)
2. Element U has atomic number 12 while element V has atomic number 16. How do the melting points of their oxides compare? Explain. (3 marks)
3. Table 1 shows the properties of two chlorides, D and E.

Chloride	Melting Points(°C)	Electrical Conductivity(liquid)
D	1074	Good
E	203	Poor

(a) State the type of bond present in:
(i) D.......................(1 mark)
(ii) E.......................(1 mark)
(b) Explain in terms of structure and bonding, the difference in electrical activity of the chlorides D and E. (1 mark)
lonic band -NaCl O TYPES OF CHEMICAL BONDS Metallic bond metallic sodium

lonic band -NaCl O TYPES OF CHEMICAL BONDS Metallic bond metallic sodium Na Na Covalent bond - H2 Hydrogen bond solid HO

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