Exothermic reactions are most common, however, an important example of an endothermic reaction isphotosynthesis in plants, where the energy supplied is from sunlight.
Law of conservation of energy: Energy cannot be destroyed or created but only transferred from one form to another. The total energy of a system of reacting chemicals and surroundings remains constant.
Enthalpy change is the term used to describe the energy exchange that takes place with the surroundings at a constant pressure and is given the symbol ΔH.
Enthalpy is the total energy content of the reacting materials. It is given the symbol, H.
ΔH = ΔH products - ΔH reactants
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