KEY TAKEAWAYS •
Heat is a form of energy, of which the Joule is the standard SI unit.
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The calorie can be used to describe heat but is a non-SI unit for heat.
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The calorimeter will measure the heat released or absorbed in a given reaction or in the combustion of a given substance.
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Enthalpy is a state function of a certain substance, like pressure and number of molecules.
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The change in enthalpy is positive in an endothermic reaction and negative in an exothermic reaction.
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