Question

List the following as exothermic or endothermic reaction:
a) Temperature of water increases on adding sulphuric acid to it.

b) Heat is absorbed when water evaporates.

c) Temperature drops when ammonium chloride dissolves in water.​

Answer 1

Answer:

a) Temperature of water increases on adding sulphuric acid to it. - exothermic

b) Heat is absorbed when water evaporates.- endothermic

c) Temperature drops when ammonium chloride dissolves in water.- exothermic

Answer 2

a) Temperature of water increases on adding sulphuric acid to it.

   →Exothermic reaction.

b) Heat is absorbed when water evaporates.

  →Endothermic reaction.

c) Temperature drops when ammonium chloride dissolves in water.​

  →Endothermic reaction.

What is exothermic reaction?

• The reactions that releases heat to the surroundings.
• It causes rise in the temperature of the immediate surroundings.
• Examples:

1. Adding water to sulphuric acid

What is endothermic reaction?

• The reactions that absorbs  heat from the surroundings.
• It causes a decrease in the temperature of the immediate surroundings.
• Examples:

1. Evaporation of water.
2. Reaction of Ammonium chloride in water.

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