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Energy Transfer In Reactions
 

Energy Transfer In Reactions

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    Energy Transfer In Reactions Energy Transfer In Reactions Presentation Transcript

    • Energy transfer in reactions
    • exothermic
      • A reaction that gives energy out, usually in the form of heat. Usually shown by a rise in temperature
      • E.g. burning fuels, neutralisation, adding water to anhydrous copper sulphate
    • endothermic
      • A reaction that takes in energy from the surroundings. Usually shown by a fall in temperature
      • E.g photosynthesis, ammonium nitrate and water, decomposition of calcium carbonate or malachite (copper carbonate)
    • Rearrangement of atoms (HT)
      • In a reaction, reactants are turned into products
      • In order to do this, the atoms of the reactants must be pulled apart by breaking the bonds between them.
      • Bonds between the atoms of the new products must then be made
    • (HT) reactants atoms products Carbon And oxygen Carbon dioxide Bonds made Bonds broken
    • Breaking and making (HT)
      • Energy is needed to break bonds
      • And is released when bonds are made
      • Breaking bonds is endothermic
      • Making bonds is exothermic
    • Energy changes (HT)
      • In an exothermic reaction, more energy is released by making bonds in the products than by breaking bonds in the reactants
      • In an endothermic reaction, more energy is needed to break bonds in the reactants than is released by making bonds in the products