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Energy changes AS chemistry revision notes
Exothermic and endothermic reactions:
A reaction that gives out energy and warms the surroundings is exothermic.
A reaction that takes in energy and cools the surroundings in endothermic.
This can be plotted on an enthalpy level diagram:
Standard enthalpy change of combustion:
Measuring standard enthalpy change of formation
Working out 2 + 3 will therefore have the same result.
Products are usually molecules or compounds Read the question to find out the reaction to tell you what goes where.
3 will always have a negative value because the indirect cycle follows 3…