C7 - Energy changes 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: ethannnnnnnnnCreated on: 16-11-17 19:36 C7 - Energy changes C7 - Energy changes 1 of 5 C7.1 - Exothermic and Endothemric reactions. Not created or destoryed. EXOTHEMRIC - ENERGY FROM SUBSTANCES TO SORROUNDINGS ENDOTHERMIC - ENERGY FROM SURROUNDING TO SUBSTANCES 2 of 5 C7.2 - Using energy transfers from reactions. Exothermic - handwarmers and self heating cans. Crystilisation of supersaturated soloution is used in reusable handwarmers. One use hand warmers heat the surroundings for longer. Endothermic -Cold packs for sport injuries. 3 of 5 C7.3 - Reaction profiles. Bond Braking - endothermic. Bond making - exothermic. 4 of 5 C7.4 - Bond energy calculations. New bonds are formed between atoms, energy is released. Exothermic reaction - energy released when new bonds are formed is greater than the energy required when bonds are broken. Endothermic reaction - energy released when new bonds are formed is less than the needed when bonds are broken. 5 of 5
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