Chemistry 2 - Rates and Energy For chemistry 2, unit 4- Rates and Energy, for AQA. 3.0 / 5 based on 1 rating ? ChemistryRate of reactionGCSEAQA Created by: Josie & VickiCreated on: 10-12-12 12:34 An explanation of chemical reactions in terms of reacting particles colliding with sufficient energy for a reation to take place. Collision Theory 1 of 9 The minimum energy needed to start of a reaction. Activation Energy 2 of 9 When readings are closely grouped together. Precision 3 of 9 A substance that speeds up a reaction but remains chemically unchanged itself at the end of the reaction. Catalyst 4 of 9 A reaction that gives out enrgy to the surroundings. Exothermic 5 of 9 A reaction that takes in energy that takes in energy from the surroundings. Endothermic 6 of 9 The process by which food molecules are broken down to release energy for the cells. Respiration 7 of 9 Describes a substance that contains water in its crystals. Hydrated 8 of 9 Describes a substance that does not contain water. Anhydrous 9 of 9
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