Enthalpy Changes – A Level Basics

3.2.1

(a) explanation that some chemical reactions are accompanied by enthalpy changes that are exothermic (ΔH, negative) or endothermic (ΔH, positive)
(b) construction of enthalpy profile diagrams to show the difference in the enthalpy of reactants compared with products
(c) qualitative explanation of the term activation energy, including use of enthalpy profile diagrams