Enthalpy

Enthalpy Change

• Enthalpy Change is the heat energy transferred in a reaction at constant pressure (kJ mol -1 )

Reactions can be either exothermic or endothermic. Exothermic reactions are reactions that gives out heat (energy). Endothermic reactions are reactions that take in heat (energy)

When a reaction is exothermic, ΔH (enthalpy change) is negative

When a reaction is endothermic, ΔH is positive

Reactions are all about breaking/making bonds -

Energy is required when you break bonds, so breaking bonds is endothermic

Energy…