5.1 Exothermic and endothermic reactions
5.1.1 Define the terms exothermic reaction, endothermic reaction, and standard enthalpy change of a reaction (∆HӨ)
5.1.2 State that combustion and neutralization are exothermic reactions.
5.1.3 Apply the relationship between temperature change, enthalpy change, and the classification of a reaction as endothermic or exothermic.
5.1.4 Deduce, from an enthalpy level diagram, the relative stabilities of reactants and products, and the sign of the enthalpy change for the reaction.
5.2 Calculation of enthalpy changes
5.2.1 Calculate the heat change when the temperature of a pure substance is altered. Students should be able to calculate the heat change for a substance given the mass, specific heat, and temperature change.
5.2.2 Design suitable experimental procedures for measuring the heat energy during changes of reactions.
5.2.3 Calculate the enthalpy change for a reaction using experimental data on temperature changes, quantities of reactants and mass of water.
5.2.4 Evaluate the results of experiments to determine enthalpy changes.
5.3 Hess’s law
5.3.1 Determine the enthalpy change of a reaction which is the sum of two or more reactions with known enthalpy changes
5.4 Bond enthalpies
5.4.1 Define the term average bond enthalpy.
5.4.2 Calculate the enthalpy change of a reaction using bond enthalpies. Be able to explain in terms of bond enthalpies, why some reactions are exothermic and some reactions are endothermic.
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