Question

2. Explain why hydrogen molecules at 20oC will be travelling on average faster than oxygen molecules at the same temperature. 3. In terms of particles explain (a) what happens when a solid melts (b) why energy is required for a solid to melt 4. Why does the air pressure in a bicycle tyre increase as more air is pumped in?

Answer 1

Answer:

becoz atomic weight of hydrogen is less than that of oxygen as the nuclear force of attrac tion is more in oxygen

when solid melts , it turns into liquid and the particles becomes loosely packed

because the particles of air is loosely packes and therefore composes more area in the tyre and increases pressure

Explanation:

Answer 2

do you study in Shiv Nadar School Noida? If so which grd r u in? 7th?