Question

Explain why
a. it is difficult to burn a piece of wood fresh from a tree?
b. pouring the dry sand over the fire extinguishes it?
c. it is difficult to use hydrogen as a source of energy?
d. charcoal is considered as a better fuel than wood?​

Answer 1

Answer:

a) because it contains moisture

b)it stops the connection of oxygen with the fire

Answer 2

a. it is difficult to burn a piece of wood fresh from a tree?

=> The fresh piece of wood contains moisture. The heat given is used to remove moisture and, therefore, it is difficuly to burn it.

b. pouring the dry sand over the fire extinguishes it?

=> Sand cuts off the supply of air which contains oxygen, a supporter if combustion.

c. it is difficult to use hydrogen as a source of energy?

=> Hydrogen is expensive, burns with a "pop" sound.

d. charcoal is considered as a better fuel than wood?

=> Charcoal has high calorific value and produces less smoke as compared to wood.

HOPE IT HELPS!!❤❤