KS3 Science · Chemistry
Acids and alkalis
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Key words
Acid Has a pH below 7
Alkali Has a pH above 7
Neutral pH 7, neither acid nor alkali
Indicator Changes colour in acids and alkalis
Litmus Red in acid, blue in alkali
Universal indicator Shows a range of colours for pH
pH scale Runs from 0 to 14
Neutralisation An acid and an alkali cancelling out
Base Any substance that neutralises an acid
Salt Made when an acid is neutralised
Corrosive Can destroy skin and other materials
Hydrogen Gas made when a metal reacts with an acid
Crystals Solid salt left after evaporation
Evaporation A liquid turning into a gas
Sodium chloride Common table salt