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Compounds of metals questions

Compounds of metals questions | form three Chemistry

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# Question
1

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.

Multiple choices
2

(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?


Short answers
3

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


Short answers
4

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.

Multiple choices
5

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.

Multiple choices
6

Which substance can be reduced when heated with carbon?

  1. Aluminium
  2. Calcium carbonate
  3. Iron (III) oxide
  4. Magnesium oxide
  5. Sodium oxide.

Multiple choices
7

A Form Three student conducted experiments in the laboratory to synthesize nitrogen, ammonia and ethane. The experimental results were tabulated as follows:

Experiment Reagents Conditions Products
1 Lead nitrate Heat Lead Oxide, Oxygen gas and nitrogen gas
2 Gaseouse hydrogen and Gaseous nitrogen Catalyst Ammonia gas
3 Ethene gas and hydrogen gas Catalyst Ethane

Write word equations with corresponding chemical equations to summarize the reactions taking place in each of the experiments 1 to 3.


Short answers