acid - A substance with a pH number below 7. , alkali - A substance with a pH number greater than 7., neutral - A substance with a pH number of exactly 7., neutralisation - A reaction in which an acid or an alkali is made neutral. , soluble - A substance that dissolves in a liquid. , insoluble  - A substance that does not dissolve in a liquid., evaporation - When a liquid substance gains sufficient energy to turn into a gas. , element  - A substance containing only one type of atom. , Compound - A substance made when two or more elements join together. , viscosity  - Describes the thickness of a liquid. ,

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