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Acid

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An acid is a solution with a pH value less than 7.

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Alkali

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An alkali is a soluble base.

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Base

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A substance that neutralises an acid – those that dissolve in water are called alkalis.

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Chemical Property

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How a substance behaves in its chemical reactions.

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Chemical Reaction

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A change in which atoms are rearranged to create new substances.

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Chemical Symbol

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A one- or two-letter code for an element that is used by scientists in all countries.

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Concentrated

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A solution is concentrated if it has a large number of solute particles per unit volume.

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Concentration

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A measure of the number of particles in a given volume.

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Corrosive

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A substance is corrosive if it can burn your skin or eyes.

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Dilute

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A solution is dilute if it has a small number of solute particles per unit volume.