Question

on cooling liquid changes into solid state give reason​

Answer 1

because molecules collide and looses energy (heat) due to which They stated to become fixed in one position ...

and hence collision decreases kinetic energy decreases and intermolecular force of attraction increases and they become solid

hopes it helps you penguin... whatever is your dp

Answer 2

Hola mate

Here is your answer -

The change from a solid into a liquid like wax for example when heated is the heat allows the molecules to bounce around and they tend to not like being kept close together. Think of it as a bunch of people in a cold room standing shoulder to shoulder front to back. This is the molecule placement of a solid bar of wax blue when you crank the thermostat. It is going to be miserable if they can escape the room they will. Same thing for the molecules. As the heat rises and the molecules continue to increase distance from one another they become a gas. A liquid might have 15 of the 30 people you had in that cold room. A gas might have only 5 or so people left in that miserable room.

A burning candle will melt and the wax pools. Ever wonder where that pool of wax goes after a long night of book reading or whatever you were doing for hours with candles burning? The heat of the flame heats the hot wax into a gas as the candle burns down. That hot gas is hydrocarbons and the flame breaks that down to hydrogen and carbon. Its the black carbon that gives candles that dark colored smoke you see sometimes.