Reaction, A process where substances change to form new substances., Reactant, A starting substance in a chemical reaction., Product, A new substance formed in a reaction., Chemical change, A change that forms new substances., Physical change, A change that does not form a new substance., Atom, The smallest particle of an element., Molecule, Two or more atoms chemically joined together., Compound, A substance made from different elements chemically bonded., Mixture, Two or more substances not chemically joined., Element, A pure substance made from one type of atom., Combustion, A reaction where a substance burns in oxygen., Oxidation, A reaction where oxygen is gained., Acid, A substance with a pH below 7., Alkali, A soluble base with a pH above 7., Neutralisation, A reaction between an acid and a base that forms salt and water.
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Chemical Changes
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