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1)An acid is a substance that dissolves in water to form hydrogen ions H+.
2)A base is a substance that can react with acids and neutralise them.
3)An alkali is a substance that dissolve in water to form hydroxide ions, OH-
4) Salts are substance produced by the reaction of an acid with a base.

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Acids- Milk, Batteries and lemons
Carbonates- Paper, Soaps and Cereal
Metals- Knifes, Kettle and Fork

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Start of the experiment

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Paper clip did rust as it was left to oxidase for 2 days but only a particular area rusted

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There was a reaction as there was bubbling observed after adding the baking powder to the vinegar.