Changing states

physical change

A change in a substance that does not involve a change in the identity of the substance

Melting

The change in state from a solid to a liquid- a solid is heated, gaining kinetic energy, weakening the force of attraction thus changing to a liquid

melting point

The constant temperature at which a solid becomes a liquid

Evaporation

The change of a substance from a liquid to a gas- a liquid on the surface is heated, gaining kinetic energy, weakening the force of attraction thus changing to a gas or vapour

Boiling

The change of state that occurs on and below the surface of a liquid which changes it into a liquid

boiling point

The constant temperature at which a liquid changes to a gas

how boiling differs from evaporation

boiling occurs at a specific temperature
boiling occurs throughout the liquid not only surface

Condensation

The change of state from a gas to a liquid- the temperature is lowered, the particles lose their kinetic energy and move slower, and over time the particles' force of attraction becomes stronger

Freezing

The change of state from a liquid to a solid- the temperature is lowered, the particles lose their kinetic energy and move slower, and over time the particle's force of attraction becomes stronger

freezing point

The constant temperature at which a liquid changes into a solid 0 degrees celsius

Sublimation

A change directly from the solid to the gaseous state without becoming liquid

substances that sublimate

iodine, carbon dioxide, ammonium chloride, naphthalene.