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Gcse Chemistry Definitions
Melting Solid changing into a liquid

Freezing Liquid changing into a solid

Condensation Gas/vapour changing into a liquid

Evaporation Liquid changing into a gas/vapour

Melting Point Temperature at which a solid turns into a liquid

Freezing Point Temperature at which a liquid changes into a solid


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Group The columns in the Periodic Table. The Group Number equals the
number of electrons in the outer shell

Period The rows of the Periodic Table. The Period Number equals the
number of shells used by the electrons of the atom.

Alkali Metals Group 1 elements. The most reactive metals…

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Relative Formula Mass The sum of the atomic masses of elements in a

Mole The formula mass expressed in grams.

Mole = mass
Formula mass

Exothermic Reaction A reaction which gives out heat.

Endothermic Reaction A reaction which takes in heat.

pH A scale of 0 ­ 14 which…

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Electrolysis A reaction where an ionic compound is split up by

Electrolyte The ionic compound which is split up by electrolysis.

Anode The positive terminal (electrode).

Cathode The negative terminal (electrode)

Reversible Reaction A reaction where reactants change to products which
can then change back to reactants.

Fertilisers Chemical…

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Solubility The maximum mass of solute which will dissolve in
100g of solvent to form a saturated solution at that
particular temperature

Hard Water Water which does not rather readily with soap.

A Homologous Series A homologous series is a group of molecules with the
same general formula and the…


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