Enthalpy Change

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9 Terms

1
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enthalpy change

heat energy change measured under conditions of standard pressure

2
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standard enthalpy changes

standard conditions (100kPa, 298K)

3
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bonds broken =

energy taken in

positive enthalpy change

4
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bonds formed = 

energy given out

enthalpy change is negative

5
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overall enthalpy change =

energy to break bonds + energy to make bonds

6
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enthalpy of formation

enthalpy change when one mole of a substance is produced from its elements under standard conditions

7
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enthalpy of formation

enthalpy change when one mole of a substance is burned completely in oxygen under standard conditions

8
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different covalent bonds →

different amount of energy required to be broken

9
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bond enthalpy values vary by situation =

-data book values are average

-values found experimentally using calorimetry methods