chemical reaction, a process where substances change to form new substances., reactant, a substance that takes part in a chemical reaction., product, a new substance formed in a chemical reaction., combine, to join substances together in a chemical reaction., chemical change, a change in which new substances are formed, physical change, a change in the state or shape of a substance where no new substance is formed., combustion (burning reaction), a chemical reaction where a substance reacts rapidly with oxygen and releases heat and light., release, to give out energy, absorb, to take in energy, neutralisation, a reaction where an acid reacts with an alkali to form salt and water., neutralised, when an acid and an alkali have reacted so the solution becomes neutral (pH 7)., neutral, a substance with pH equal to 7, which is neither acidic nor alkaline., exothermic reaction, a chemical reaction that releases heat energy to the surroundings., endothermic reaction, a chemical reaction that absorbs heat energy from the surrounding, oxidation reaction, a reaction where a substance reacts with oxygen, acid, a substance with pH less than 7, alkali, a soluble base with pH greater than 7, salt, a substance formed when an acid reacts with an alkali, bubble, a small pocket of gas trapped in a liquid, energy, the ability to cause change in a chemical reaction, often released or absorbed as heat

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