Question

Give reasons for the following.
(a) LPG burns immediately on coming in contact with a matchstick while coal takes
time.
(b) If clothes of a person catch fire, we cover him with a blanket.
(c) If we keep a paper cup on flame, it will burn, but, if we take some water in the
paper cup, it will not burn even on putting on fire.​

Answer 1

Explanation:

a) Because the LPG is a gas and the molecules of LPG has intermolecualr space. so it chatch tha fire fast .

b)When clothes of a person catch fire, his body is covered with blanket to stop the supply of oxygen. Air (oxygen) is essential for combustion. In the absence of air, combustion will not occur. Hence, the fire will be extinguished.

c)When paper cup is heated containing water, water absorbs the heat coming from the burning source and thus prevents the paper from reaching its ignition point. Hence it does not burn. ... This is due to absorption of heat by water.

Answer 2

1. i dont know its answer so