Question

7. List out the materials which evaporate faster than water and slower than water.

8. Water present in pot is cold why ?

9. During the process of melting of ice, what is the main observation have you noticed ?​

Answer 1

The answers have been listed down as follows :-

(7) Materials which evaporate faster than water :-

• Ethanol
• Acetone
• Alcohol
• Naphthalene
• Anthracene
• Methylated spirit

Materials which evaporate slower than water :-

• Oil
• Milk
• Juice
• Syrup
• Vinegar
• Grease

(8) Water, stored in an earthen pot, is cooler than the normal temperature. This is because some portion of water seeps into the pot, which results in their evaporation due to low pressure. The latent heat of evaporation escapes the stored water, hence making it cooler.

(9) During the process of melting, it is noticed that the internal energy of molecules increases simultaneously with the change of state of water from solid (ice) to liquid (water).