During chemical reactions, enthalpy changes occur as bonds are broken and formed.
The energy level diagram for an endothermic reaction is shown below.
Complete the diagram by labelling parts A to E.
An element X undergoes complete combustion according to the following equation. The enthalpy change, ΔH, and activation energy, Ea, for this reaction are -520 kJ mol-1 and +630 kJ mol-1 respectively. Deduce whether this reaction is exothermic or endothermic.
X + O2 → XO2
Define the term average bond enthalpy.
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