C7.3 Energy Changes in Chemistry 3.5 / 5 based on 2 ratings ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEOCR Created by: LiliCreated on: 19-06-13 13:24 What is an Exothermic Reaction? Exothermic reactions give out energy to their surroundings. The energy of the products is less than the energy of the reactants. 1 of 8 Give Some Examples of Exothermic Reactions. Burning, Respiration, Reaction with dilute hydrochloric acid with sodium hydroxide solution. 2 of 8 In Chemical Reactions New Bonds Are Made to Form Products. Describe the Process. Creating new bonds to form products gives out energy, therefore making bonds is an exothermic reaction. 3 of 8 What is an Endothermic Reaction? Endothermic reactions take in energy from their surroundings. The energy of the products is greater than the energy of the reactants. 4 of 8 Give Some Examples of Endothermic Reactions. Photosynthesis, The reaction of solid citric acid with sodium hydrogen-carbonate solution. 5 of 8 In Chemical Reactions Chemical Bonds in the Reactants Break. What Happens in this Process? Breaking bonds takes in energy, meaning breaking bonds is an endothermic reaction. 6 of 8 If the Value for an Energy Transfer is Negative, What Type of Reaction is it? It is an Exothermic reaction. If it is a positive energy transfer it will be an Endothermic reaction. 7 of 8 What is Activation Energy? Every reaction needs a certain minimum energy before it can start, this is the activation energy, it is different for every reaction. 8 of 8
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