Question

Identify the type of chemical reaction taking place in each of the following:
(a) Barium chloride solution is mixed with a copper sulphate solution and a white precipitate is observed.

(b) On heating copper powder in the air in a china dish, the surface of copper powder turns black.

(c) On heating, green coloured ferrous sulphate crystals, reddish brown solid is left and a smell of a gas having an odour of burning sulphate is experienced.

(d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

(e) Quick lime reacts vigorously with water releasing a large amount of heat.

Answer 1

Precipitation; redox; thermal decomposition; displacement and exothermic reactions respectively

Explanation:

a) BaCl2 + CuSO4→ BaSO4 (↓) + NaCl

This is a double displacement reaction in which a precipitate is formed. Any reaction that produces a precipitate is called a precipitation reaction.

b) On heating copper powder in air in a China dish, the surface of copper powder turns black to form copper oxide. This reaction is a redox reaction.

c) When green coloured crystals of ferrous sulphate (FeSO4) is heated , it decomposes to form Ferric Oxide (Fe2O3), sulphur trioxide (SO3) and sulphur dioxide (SO2) gas. This reaction is a thermal decomposition reaction.

d) CuSO4(aq) + Fe (s) → FeSO4(aq) + Cu (s)

This is a single displacement reaction where iron displaces copper from copper sulphate.

e) Quick lime reacts vigorously with water to produce slaked lime, releasing a large amount of heat. The reaction is an exothermic reaction.

Answer 2

1.double displacement

2.combination reaction

3.thermal decomposition

4.displacement reaction

5.combination and exothermic reaction

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