1) Reaction between magnesium and oxygen.
9 Reaction between hydrogen and oxygen.
10 Reaction between ammonia and hydrogen chloride.
11 Carbon dioxide is flowed through lime water.
12 Lead(II) carbonate is being heated.
13 Zinc Nitrate is being heated.
14 Sodium nitrate is being heated.
15 Reaction between sulphur dioxide and water.
16 Carbon dioxide reacts with water.
17 Reaction between |ead (II) nitrate solution and sodium chloride solution.
18 Ionizations of hydrogen chloride gas in water.
19 The decomposition of hydrogen peroxide with the presence of manganese (lV) oxide as a catalyst.
20 The decomposition of potassium chlorate (V) by heat with the presence of copper(II) oxide as a catalyst.