Question

chem class 9.. please help ​

Answer 1

Answer:

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Explanation:

Answer: (i) Reaction of water with quicklime (ii) Dilution of an acid

Exothermic reactions are chemical reactions that release energy as heat or light.

• A large amount of heat is released when quick lime reacts with water, along with the formation of calcium hydroxide.
• Similarly, the process of dissolving an acid or base in water is a highly exothermic reaction. Water should never be added to acid, but the acid can be added to water for dilution.
• Evaporation of water and sublimation of camphor are endothermic reactions.

Answer 2

Answer:

(i) Reaction of water with quicklime (ii) Dilution of an acid

Exothermic reactions are chemical reactions that release energy as heat or light.

A large amount of heat is released when quick lime reacts with water, along with the formation of calcium hydroxide.

Similarly, the process of dissolving an acid or base in water is a highly exothermic reaction. Water should never be added to acid, but the acid can be added to water for dilution.

Evaporation of water and sublimation of camphor are endothermic reactions