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Endothermic and Exothermic Changes

Define the fo...

Question

Define the following terms
(i) Condensation
(ii) Freezing
(iii) Subimation

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Solution

(i) Condensation: The process of conversion of gas into its liquid state is called Condensation.
(ii) Freezing: The process of conversion of liquid into its solid state is called Freezing.
(iii) Sublimation: The process in which a solid is converted directly into a gas is called sublimation.

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Q. Which of the following processes involve absorption of energy?

(i)	Boiling
(ii)	Sublimation
(iii)	Condensation

Q. Define the following terms :
(a) Condensation
(b) Freezing

Q. Give examples for the following processes.
(i) Condensation
(ii) Evaporation
(iii) Transfer of heat
(iv) Sublimation

Q. Match the equilibria with the corresponding conditions.
i) Liquid ⇌ Vapour 1. Melting point
ii) Solid ⇌ Liquid 2. Freezing point
iii) Solid ⇌ Vapour 3. Boiling point
iv) Liquid ⇌ Solid 4. Sublimation point
5. Condensation point

Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

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