Topic 5- Energy Changes - EXO AND ENDO Reactions

Subdecks (1)

Cards (34)

  • Exothermic reaction
    A reaction that transfers energy to the surroundings so the temperature of the surroundings increases
  • Endothermic reaction
    A reaction that takes in energy from the surroundings so the temperature of the surroundings decreases
  • Endothermic reactions
    • Thermal decomposition
    • Reaction of citric acid and sodium hydrogencarbonate
  • Everyday examples of exothermic reactions
    • Self-heating cans (e.g. for coffee)
    • Hand warmers
  • Everyday examples of endothermic reactions

    • Sports injury packs
  • Activation energy
    Minimum amount of energy that particles must have to react
  • Exothermic reaction

    Products have less energy than reactants
  • Endothermic reaction
    Products have more energy than reactants
  • Exothermic reactions
    • C- Combustion
    • O- Oxidisation Reactions
    • N - Neutralisation
  • Everyday examples of exothermic reactions

    • Self-heating cans (e.g. for coffee)
    • Hand warmers
  • Everyday examples of endothermic reactions

    • Sports injury packs
  • Activation energy

    Minimum amount of energy that particles must have to react
  • Exothermic reaction
    Products have less energy than reactants
  • Endothermic reaction
    Products have more energy than reactants
  • Energy changes during a chemical reaction
    1. Energy must be supplied to break bonds in the reactants
    2. Energy is released when bonds in the products are formed
  • The sum of energy taken in to break bonds - the sum of energy released to form bonds = the overall energy change
  • Endothermic reaction
    Energy taken in to break bonds is more than the energy released when bonds are formed
  • Exothermic reaction
    Energy taken in to break bonds is less than the energy released when bonds are formed