Tag: chemistry

On the heating matter, the kinetic energy of particles increases, so they gain energy and on the cooling matter, the particle's the motion of particles decreases, so they lose energy.

At melting point, the particles get converted into a liquid.

On cooling a gas, the temperature falls down and the stored potential energy is released in the form of heat energy so that the temperature fall and the gas becomes cool.

The phenomenon of change from one state of matter to another and then back to the original state is called the inter-conversion of states of matter.

Inter-conversion of states of matter is affected by 1. Changing the temperature.
2. Increasing or decreasing the pressure.
3. Changing both temperature and pressure.

Solids have the lowest kinetic energy whereas gases have the highest kinetic energy. Hence, hydrogen has the highest kinetic energy among the above examples.

At freezing point, particles slow down, come close and get converted into a solid. Inter-molecular forces increase.

The change of state of a substance directly from solid to gas without changing into a liquid state is known as sublimation.

Solids have least amount of kinetic energy. When the kinetic energy increases, the velocity of particles increases. The particles collide with a greater force. Thus, the ordered arrangement of solid breaks which results in phase change.

On cooling gases/liquid, the temperature falls. Particles gain energy. Intermolecular attraction increases. Intermolecular space between the particles/molecules of gases decreases.