Hess's Law

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5 Terms

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first law of thermodynamics

energy cannot be created or destroyed

2
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Hess’s law

total enthalpy change in a chemical reaction is independent of the route by which the chemical reaction takes place as long as the initial and final conditions are the same

3
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energy cycles

enthalpy change of direct route is the same as the enthalpy change of the indirect routes

<p>enthalpy change of direct route is the same as the enthalpy change of the indirect routes </p>
4
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energy cycle for enthalpy change of reaction

Hr=H2-H1…write balanced equation at top…elements at bottom

<p>Hr=H2-H1…write balanced equation at top…elements at bottom</p>
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energy cycle for enthalpy change of combustion

Hf=H1-H2…write equation on top adding oxygen to both reactants and products…water and oxygen at bottom

<p>Hf=H1-H2…write equation on top adding oxygen to both reactants and products…water and oxygen at bottom</p>