UNIT FIVE: Energy changes in reactions 4.0 / 5 based on 1 rating ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEEdexcel Created by: PhoebeCreated on: 02-03-13 15:36 What would a reaction that gets cooler be known as? Endothermic 1 of 8 Give an example of an exothermic reaction Combustion- one that releases heat energy. 2 of 8 What energy change happens when bonds are broken? Energy is ABSORBED. 3 of 8 What is the correct equation for the transfer of energy? mass of water x 4.2 x temperature rise. 4 of 8 What type of reaction will occur if more energy is released when the bonds are made? Exothermic. 5 of 8 When can a collision happen? When the colliding partcles have enough energy. This is called activation energy 6 of 8 Reactions eventually stop. What is generally the reason for this? Reactions stop when one or more of the reactants is used up. 7 of 8 Why would powdered magnesium react faster than magnesium ribbon? Because the powder has a larger surface area and this speeds up the rate of a reaction 8 of 8
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