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5. Chemical energetics

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  1. 5.1 Exothermic and endothermic reactions

    1. 5.1.1An exothermic reaction transfers

      • State: an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings

    2. 5.1.2An endothermic reaction takes in

      • State: an endothermic reaction takes in thermal energy from the surroundings leading to a decrease in the temperature of the surroundings

    3. 5.1.3Interpret reaction pathway diagrams

      • Interpret reaction pathway diagrams showing exothermic and endothermic reactions

    4. 5.1.4Transfer of thermal energy during a

      • State: the transfer of thermal energy during a reaction is called the enthalpy change, ∆H, of the reaction. ∆H is negative for exothermic reactions and positive for endothermic reactions

    5. 5.1.5Activation energy, Ea, as the minimum

      • Define activation energy, Ea, as the minimum energy that colliding particles must have to react

    6. 5.1.6And label reaction pathway diagrams

      • Draw and label reaction pathway diagrams for exothermic and endothermic reactions using information provided, to include: (a) reactants (b) products (c) enthalpy change of the reaction, ∆H (d) activation energy, Ea

    7. 5.1.7Bond breaking is an endothermic

      • State: bond breaking is an endothermic process and bond making is an exothermic process and explain the enthalpy change of a reaction in terms of bond breaking and bond making

    8. 5.1.8Enthalpy change of a reaction using

      • Calculate the enthalpy change of a reaction using bond energies