Acid, Substance with a pH of less than 7., Corrosive, Dissolve or eat away other material., Harmful, Causing or likely to cause harm., Irritant, Continually annoying or distracting., Alkali, Contains OH- particles, chemical opposite of an acid., Indicator, Changes to different colour in acid and alkali., Neutral, Neither acid nor alkali, is at pH 7, Universal Indicator, Mixture of different indicators for testing different pH values., Neutralisation, Change acids or alkalis into solutions of pH 7., Neutralised, Has been made neutral, is at pH 7., Reacted, Structure of a substance has been rearranged., Indigestion, Pain/discomfort in stomach from poor digestion., Model, Explaination for something that cannot be experienced directly., Litmus paper, Paper that changes to a different colour in acid or alkali., Word equation, Shorthand way of writing a chemical equation., Reactants, Starting substances used in a reaction., Products, New substances formed in a reaction., Metal + Acid ->, Salt + Hydrogen gas.

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