Write a balanced equation by taking an example of your own.

(i) An acid and an alkali.

(ii) An ammonium salt and an alkali

(iii) A nitrate and a mineral acid

(iv) A hydrocarbon and oxygen in excess

(v) A metal hydrogen carbonate and an acid.

5.72 grams of hydrated sodium carbonate is heated strongly. The white residue left over is 2.12 g. Calculate:

(i) the formula of hydrated sodium carbonate

(ii) the percentage of carbon in the compound.

[Na = 23, C = 12, O = 16, H = 1]

Within a Group, where would you expect to find the element with :

(i) the greatest metallic character ?

(ii) the largest atomic size ?

Define ionisation potential ? State whether it increases on going down a group.