A mixture consisting of 78% nitrogen, 21% oxygen and 1% other gases &

water vapour.

air

A mixture of metals, e.g. brass.

alloy

The temperature at which a liquid changes to a gas.

Water boils at 100ºC

boiling point

A method of separating substances.The substances are separated as they move, in a solvent, through a material, e.g. paper.

The substances often move at different speeds.

chromatography

A piece of apparatus which coolsa gas to change it to a liquid.

condenser

A valuable mixture of many different hydrocarbons. Many

useful chemicals can be extracted from it.

crude oil

The process that occurs when a solute is added to a suitable solvent, e.g. salt will dissolve in water.

dissolve