Question

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Question number 6. Only question number 6 (six).

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Answer 1

Answer:

(a) Decomposition of ferrous sulphate absorbs heat during reaction therefore it is an example of endothermic reaction.

(b) When we dissolve sulphuric acid in water, large amount of heat is liberated so it is an exothermic reaction.

(c) When we dissolve sodium hydroxide in water, large amount of heat is liberated so it is an exothermic reaction.’

(d) Mixing of ammonium chloride in water absorbs heat from reaction mixture therefore it is an example of endothermic reaction.

Explanation:

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Answer 2

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1) Limitations of a chemical equation are:

1. It does not give any data about the rate of the reaction
2. It may not be kinetically feasible
3. It does not tell about the actual yield of the products formed

2) Souring of milk is a chemical reaction because, the reaction cannot be reversed and the reaction causes the formation of new particles

Evaporation of water and dissolution of sugar in water are both reversible and there is no formation of new particles

3) 4 changes that help us determine if a chemical reaction has occured are :

1. Change in temperature (Exothermic or endothermic)
2. Change in colour
3. Formation of precipitate
4. Noticable odour

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