Determining Enthalpy Change Using Hess's Law

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8 Terms

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Enthalpy change

The heat energy transferred in a reaction at constant pressure.

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Hess's Law

States that the enthalpy change for a reaction is independent of the path taken.

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Specific heat capacity

The amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius.

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Neutralisation reactions

Reactions between an acid and a base that produce salt and water.

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Q = mcΔT

Formula for calculating heat energy, where Q = heat energy, m = mass, c = specific heat capacity, ΔT = change in temperature.

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∆H = Q/moles

Formula for calculating enthalpy change, where Q is in kJ.

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Exothermic reaction

A reaction that releases heat to its surroundings.

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Endothermic reaction

A reaction that absorbs heat from its surroundings.