Chemistry C3 3.3 Energy level diagrams. 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: Atlanta and JacobCreated on: 04-03-16 19:01 What can be shown on energy level diagrams? The relative difference in the energy of reactants and products. 1 of 13 What do catalysts provide? A pathway with a lower activation energy so the rate of reaction increases. 2 of 13 What type of reaction is bond breaking? Endothermic. 3 of 13 What type of reaction is bond making? Exothermic. 4 of 13 In what direction do endothermic changes go in an energy level diagram? Up (energy in). 5 of 13 In what direction do exothermic changes go in an energy level diagram? Down (energy exits). 6 of 13 What is the difference between energy levels of reactants and products? The energy change for the reaction. 7 of 13 How can we show energy changes for chemical reactions? On energy level diagrams. 8 of 13 What must occur for a chemical reaction to take place? Bonds must be broken, this is endothermic because energy is taken in. 9 of 13 What is the minimum energy needed for the reaction to happen called? The activation energy. 10 of 13 What happens when new bonds in the products are formed? Energy is released and so this is exothermic. 11 of 13 How can we show the activation energy and how the energy changes during a reaction? On an energy level diagram. 12 of 13 What do catalysts do? Increase the rate of a reaction by providing a different pathway with an activation energy that is lower. 13 of 13
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