Compounds of metals questions | form three Chemistry

The reason why white anhydrous copper (II) sulphate turns blue when exposed in atmosphere is that it,

1. reacts with carbon dioxide.
2. reacts with oxygen.
3. becomes dry.
4. absorbs water vapour.
5. decomposes.

Answer / Solution

UNSOLVED

(i) Arrange the following metals in order of increasing reactivity; zinc, magnesium, calcium, copper and mercury.
(ii) Which one of the metals in (i) above reacts with steam to form an oxide which is white when cold and yellow when hot?

Answer / Solution

UNSOLVED

With the aid of chemical equations, explain what will happen when aluminium chloride reacts with water.

Answer / Solution

UNSOLVED

Which carbonate is the most stable to heat?

1. Calcium carbonate
2. Copper (II) carbonate
3. Lead (II) carbonate
4. Zinc carbonate
5. Iron (II) carbonate.

Answer / Solution

UNSOLVED

Aluminium does not react with water and does not corrode much in air because

1. it is below hydrogen in the reactivity series
2. it forms a stable carbonate which prevents reactions
3. the metal is covered with a protective coating of an oxide
4. aluminium ions have positive charges
5. it is very stable.

Answer / Solution

UNSOLVED