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There are different ways to separate mixtures, eg by filtration, crystallisation, distillation or chromatography. The method chosen depends upon the type of mixture.

Matter is the "stuff" that makes up the universe. Everything that has mass is matter. In normal everyday life, we come across matter in three states, solid, liquid and gas.

A table of the chemical elements is arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.

Everything is made from atoms, including you. Atoms are tiny particles that are far too small to see, even with a microscope.

Atoms are made up of three smaller particles called protons, electrons and neutrons.

Humans have been using metals for over 7000 years and they have a wide variety of applications. They are one of our most important resources.

Air is the mixture of gases that makes up the atmosphere. The amount of water vapour in the air varies from place to place, and day to day.

Acids and alkalis are common in daily life. They are found in the home, in our bodies, in industry, car batteries and school science labs.