Energetics 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEEdexcel Created by: DANIELLEISGREATCreated on: 07-12-16 18:52 Exothermic reaction Heat energy is given out, temperature of the surroundings increases 1 of 17 Example of an exothermic recation Combustion , neutralisation, respiration etc. 2 of 17 Endothermic reaction Heat energy is taken in and the surrounding temperature increases 3 of 17 Example of an exothermic reaction Photosynthesis 4 of 17 What is Calorimetry? The amount of heat energy transferred in a reaction 5 of 17 What is the equation for energy transferred? Energy transferred = mass of solution x specific heat capacity x temp. change 6 of 17 A reaction that takes in heat is called Endothermic 7 of 17 Energy is usually given out in reactions as Heat energy 8 of 17 A system that has nothing added or taken away is called A closed system 9 of 17 Anhydrous means Without water 10 of 17 Anhydrous copper sulphate is used to Test for water 11 of 17 How do you work out molar enthalpy change? Work out the energy transferred , work out how many moles there are, divide energy by mols 12 of 17 If the reaction is exothermic is the molar enthalpy change positive or negative? Negative 13 of 17 If the reaction is endothermic is the molar enthalpy change positive or negative? Positive 14 of 17 Is breaking bonds endo or exo thermic ? Endothermic - breaking bonds would use up energy so energy from the outside would need to be taken in 15 of 17 Is making bonds endo or exo thermic? Why ? Exothermic - energy is given out so the surrounding areas temp would increase 16 of 17 What can be used to work out the enthalpy change during a chemical reaction ? The average bond energy 17 of 17
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