Chemistry - States of matter and kinetic molecular theory

Diffusion

The movement of atoms or molecules from an area of higher concentration to an area of lower concentration.

Brownian Motion

The random movement of microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas

Freezing point

The temperature at which a liquid changes to solid by the removal of heat

Melting point

The temperature at which a solid , given sufficient heat , becomes a liquid

Boiling point

The temperature at which the vapour pressure of a substance equals atmospheric pressure

Melting

The process during which a solid changes to a liquid by the application of heat

Evaporation

The change of a liquid into vapour at any temperature below the boiling point

Freezing

The process during which a liquid changes to a solid by the removal of heat

Sublimation

The process during which a solid changes directly into a gas without passing through an intermediate liquid phase.

Condensation

The process during which a gas or vapour changes to a liquid, either by cooling or by being subjected to increased pressure.

Temperature

The temperature of a substance is a measure of the average kinetic energy of the particles.

Heating curve

Graph showing the change in temperature over time when a substance is being heated.

Cooling curve

Graph showing the change in temperature over time when a substance is being cooled.

All matter consists of

small particles

The particles are in

constant motion

There are forces of

attraction between the particles