Energy from reactions 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: Emily_OCreated on: 08-11-13 18:33 What is an exothermic reaction? A reaction that releases energy to the surroundings 1 of 12 What is an endothermic reaction? A reaction that takes in heat 2 of 12 What can simple calorimetry be used for? Measuring the relative amounts of energy released when substances burn 3 of 12 How can the amount of energy released or absorbed by a chemical reaction be calculated? From the measured temperature change of the solution and using the equation Q = mc /\ T 4 of 12 What can we show with energy level diagrams? The relative difference in the energy of the reactants and products on energy level diagrams 5 of 12 What do catalysts do? They lower the activation energy so a greater proportion of reactant particles have enough energy to react 6 of 12 Is bond making exo or endothermic? Exothermic 7 of 12 Is bond breaking exo or endothermic? Endothermic 8 of 12 In an exothermic reaction is the energy released from forming bonds greater all smaller than the energy needed to break existing bonds? Greater 9 of 12 In an endothermic reaction is the energy needed to break existing bonds greater all smaller than the energy released from forming new bonds? greater 10 of 12 Word equation for the combustion of hydrogen Hydrogen + oxygen -> water 11 of 12 How can hydrogen be used as a fuel? Either burned in combustion engines or used in fuel cells to power engines 12 of 12
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