Chemistry: definitions for thermochemistry

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6 Terms

1
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bond energy

average energy required to break one mole of bonds into neutral gaseous atoms

2
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heat of combustion

heat change when 1 mole of substance is completely burned in excess oxygen

3
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heat of reaction

heat change when teh numbe rof moles in a balanced equation react

4
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heat of formation

heta changewhen 1 mole of a compound is formed from its elements in their standard state

5
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Hess’s law

heat change for a reaction is teh same wether it takes place in one step or multiple steps

6
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low of lavoisier and laplace

heat change for teh forward reaction is equal to the heat change for the reverse reaction, but opoosite sign