Topic C3: Chemical Reaction; Definitions 0.0 / 5 ? ChemistryChemical ReactionGCSEOCR Created by: MiriamLCreated on: 13-04-20 16:19 Atoms Cannot be created or destroyed 1 of 25 Closed system Container where no substances can leave or enter during the reaction. The mass of the reaction mixture does not change 2 of 25 Mole Unit for the amount of a substance. 3 of 25 Avagadro constant If you have a mole you have 6.02*10^23 of them. 4 of 25 Exothermic reaction Energy is released. Temperature rises 5 of 25 Endothermic reaction Energy is absorbed. Temperature decreases 6 of 25 Activation energy Amount of energy to needed break the bronds 7 of 25 Oxidation gain of oxygen by a substance 8 of 25 Reduction loss of oxygen by a substance 9 of 25 Redox reaction where both oxidation and reduction both happens 10 of 25 Reducing agent The substance that gains the oxygen. (Because it reduces the other) 11 of 25 Oxidising agent The substance that loses the oxygen. (Because it oxidises the other other substance) 12 of 25 Acid releases hydrogen ions when it dissolves in water 13 of 25 Base A substance that will neutralise an acid. If it can dissolve in water it is known as an alkali. Releases OH- ions when dissolved in water. 14 of 25 Electrolysis Breaks down a compound using eletricity 15 of 25 Electrolyte Compound with mobile ions so it conducts electricity 16 of 25 Electrodes Conduct electricity to the electrolyte 17 of 25 Cathode Negative 18 of 25 Anode Positive 19 of 25 P.A.N.I.C Positive Anode Negative In Cathode 20 of 25 Positive ions Cations 21 of 25 Negative ions Anions 22 of 25 Aquoeus solution four ions present . H+ and OH- of the water. Ions of the compound dissolved in it 23 of 25 Electroplating Type of electrolysis using non-inert electrodes 24 of 25 Inert something that doesn't react 25 of 25
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