Everything Science Grade 10

CHAPTER 6. CHEMICAL BONDING 6.6

4. Use your knowledge of the different types of bonding to explain the fol-

lowing statements:

a. A sodium chloride crystal does not conduct electricity.

b. Most jewellery items are made from metals.

c. It is very hard to break a diamond.

d. Pots are made from metals, but their handles are made from plastic.

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(1.) 002b (2.) 002c (3.) 002d (4.) 002e

Writing formulae ESACD

In chapter 2 you learnt about the writing of chemical formulae. Table 6.2 shows some of

the common anions and cations that you should know.

Name of compound ion formula Name of compound ion formula

Acetate (ethanoate) CH 3 COO− Manganate MnO^24 −

Ammonium NH+ 4 Nitrate NO− 3

Carbonate CO^23 − Nitrite NO− 2

Chlorate ClO− 3 Oxalate C 2 O^24 −

Chromate CrO^24 − Oxide O^2 −

Cyanide CN− Permanganate MnO− 4

Dihydrogen phosphate H 2 PO− 4 Peroxide O^22 −

Hydrogen carbonate HCO− 3 Phosphate PO^34 −

Hydrogen phosphate HPO^34 − Phosphide P^3 −

Hydrogen sulphate HSO− 4 Sulphate SO^24 −

Hydrogen sulphite HSO− 3 Sulphide S^2 −

Hydroxide OH− Sulphite SO^23 −

Hypochlorite ClO− Thiosulphate S 2 O^23 −

Table 6.2: Table showing common compound ions and their formulae

Chemistry: Matter and Materials 119