Energy Transfer and Bond Energies 2.0 / 5 based on 1 rating ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEOCR Created by: Hayley GoddardCreated on: 06-06-13 17:51 During chemical reaction what happens to old bonds? Old bonds are brokken and new bonds are formed 1 of 8 What is an endothermic reaction? When energy is supplied to break existing bonds 2 of 8 What is an exothermic reaction? Energy is released when new bonds are formed 3 of 8 In exothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them? The energy released by forming bonds 4 of 8 In endothermic reactions what is greater? The energy released by forming bonds OR the energy used to break them? The energy used to break them 5 of 8 What does every chemical bond have associated with it? A particular bond energy 6 of 8 How can this bond energy vary? It can vary slightly depending on the compound of the bonds 7 of 8 What can you use the known bond energies to calculate? The overall energy change for a reaction 8 of 8
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