Edexcel IGCSE Chemistry
Sunday 19 May 2013
4.13 understand the use of ΔH to represent enthalpy change for exothermic and endothermic reactions
The amount of thermal energy change is given the symbol ΔH.
For an exothermic reaction, ΔH is given a negative sign.
For an endothermic reaction, ΔH is given a positive sign.
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