Bondenergyduringareaction Study guides, Class notes & Summaries
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AQA AS Chemistry Revision Notes 2022 updated
- Summary • 36 pages • 2023
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Enthalpy Changes 
 
The total chemical energy inside a substance is called the enthalpy (or heat content) 
When chemical reactions take place, changes in chemical energy take place and therefore the enthalpy changes 
An enthalpy change is represented by the symbol ΔH (Δ= change; H = enthalpy) An enthalpy change can be positive or negative 
Exothermic reactions 
A reaction is exothermic when the products have less energy than the reactants Heat energy is given off by the reaction to the surroun...
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