Acid - Solution with a pH of less than 7 which will corrode, Alkali - Solution with a pH of more than 7, Combustion - Chemical Reaction of fuel and oxygen producing energy and an oxide, Compost - Rotting vegetation used to return nutrient to gardens, Concrete - Building material made from cement, water, sand and gravel, Digestion - Food broken down in the stomach and intestines, Endothermic - Reaction which uses up heat, Exothermic - Reaction which gives out heat, Explosion - Very fast chemical reaction, Neutralisation - Reaction between an acid and an alkali, Photosynthesis - Chemical reaction in green plants which changes carbon dioxide and water into sugar and oxygen, Product - The new material that is produced by a chemical reaction, Reactant - The materials which react together in a chemical reaction, Respiration - Chemical reaction in all living things which changes sugar and oxygen into energy and carbon dioxide, Rotting - Matter broken down by bacteria in the soil, Rusting - Chemical Reaction of iron, water and oxygen producing hydrated iron oxide,

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