Question

please give answers fast​

Answer 1

see book.find yourself, don't depend on other.

Answer 2

18.(a)Evaporation causes cooling because heat energy is absorbed by surrounding particles.

(b)Ice is solid at 0° C bcoz it has a definite volume & definite shape due to strong intermolecular forces. Water is liquid at room temperature bcoz it has definite volumebit not definite shape due to weak intermolecular forces of attraction.