Vaporization is the change of a liquid into a gas. The temperature at which a liquid boils is its boiling point.

Melting is the change of a solid into a liquid when heat is applied. The melting point is the temperature at which a solids change to a liquid.

Sublimation is the change of a solid into a gas. It takes place when solids absorb enough energy to completely overcome the forces of attraction between them.

Deposition is the change of a gas into a solid. It occurs when gas particles become very cold.

Condensation is the change of a gas into a liquid. It occurs when water vapour in the air changes into liquid water when it comes in contact with a cooler surface.

Freezing is the change of a liquid into a solid when cold is applied. The temperature at which it occurs is known as the freezing point.

An isotope is a variation of the same element with a different number of neutrons in its nucleus. The isotopes of an element.

Neutrons, along with protons, are subatomic particles found in the nucleus of every atom except that of simple hydrogen

This educational file shows you the main differences between acid [...]