Alkali - Solution with a pH greater than 8. , Acid - Solution with pH lower than 6, Atom - Smallest part of any element, Compound  - A molecule with two or more different atoms chemically bonded, Indicator - Substance which changes colour depending on pH., Hydrochloric Acid - A strong acid found in the lab., Neutralisation - Reaction which occurs when anacid and alkali are mixed, pH - Scale used to measure acidity. , Neutral - Solution with pH 7, for example distilled water and salt solution, Citric acid - A weak acid found in some fruits, Completely ionise in water - Strong acids do this, Partially ionise in water - Weak acids do this in water,

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