Give an example of a chemical reaction for each of the following situations:
(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.
(d) Heat is produced.
(e) Change in taste is observed.
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(a) Reaction between copper sulphate soludon and zinc metal. The blue colour of the copper sulphate solution fades away and a red brown metallic copper is formed.
(b) Reaction between baking soda and vinegar. Baking soda on reaction with vinegar produces carbon dioxide.
(c) Burning of crackers.
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