Question

1. Comment on the following statements:
(a) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increase in
humidity.
(c) Sponge though compressible is a solid.

2. Why does the temperature of a substance remain constant during its melting
point or boiling point?

3. You are provided with a mixture of naphthalene and ammonium chloride by
your teacher. Suggest an activity to separate them with well labelled diagram.

4.
(a) Conversion of solid to vapour is called sublimation. Name the term used to
denote the conversion of vapour to solid.
(b) Conversion of solid state to liquid state is called fusion; what is meant by
latent heat of fusion?

5. It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon
clothes respectively. Who do you think would be more comfortable and why?

Answer 1

Answer:

Explanation:A - BECAUSE ALL THE MOLECULES WHICH IS IN HIGH TEMPRATURE GETS ENOUGH ENERGY TO THAT IT CONVERT IT INTO GAS , THERFORE  HEAT IS UTLISED IS BREACKING THE INTERMOLECULER FORCE OF ATTRACTION

B - BECAUSE MORE THE PARTICLES  OF WATER VAPOUR LESS THE SPACE