Energy from Reactions

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  • Energy from Reactions
    • During a chemical reaction
      • Energy is SUPPLIED to BREAK bonds
      • Energy is RELEASED when bonds are FORMED
    • Exothermic reactions
      • Energy RELEASED from forming new bonds is GREATER than energy NEEDED to break existing bonds
    • Endothermic Reactions
      • Energy NEEDED to break existing bonds is GREATER than the energy RELEASED from forming new bonds
    • Catalysts
      • Provide a different pathway for a chemical reaction
        • That has a lower activation energy
    • Hydrogen Fuel Cell
      • Hydrogen can be burnt as fuel in combustion engines
        • Hydrogen+Oxygen-->Water
        • Can also be used in fuel cells that produce electricity
          • To power vehicles
    • Calculations
      • Relative amounts of energy released when substances burn
        • Can be measured by simple calorimetry
          • E.g. by heating water in a glass or metal container
      • Amount of energy released/absorbed by chemical reactions in solution
        • Calculated from the measured temperature change of a solution
          • When reagents are mxied in an imsulated container
          • This method can be used for reactions of solids with water or for neutralisation reactions

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