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7 ­ Energetics
7.2 Enthalpy Key Terms
For AS AQA Chemistry
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Slide 2

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Enthalpy Change
A measure of heat energy given out
or taken in when a chemical or
physical change occurs at a
constant pressure
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Slide 3

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Enthalpy Diagrams
Diagrams in which the enthalpies
(energies) of the reactants and
products of a chemical reaction
are plotted on a vertical scale to
show their relative levels
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Slide 4

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Heat is a form of energy, so a
heat change can also be
described as an enthalpy change
An enthalpy change is still an
energy change but is measured
under stated conditions of
temperature & pressure
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