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Energy Transfer In Reactions
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Energy Transfer In Reactions

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  • higher tier (GCSE)
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  • 1. Energy transfer in reactions
  • 2. 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
  • 3. 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)
  • 4. 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
  • 5. (HT) reactants atoms products Carbon And oxygen Carbon dioxide Bonds made Bonds broken
  • 6. 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
  • 7. 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