Enthalpy change

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5 Terms

1
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enthalpy change

heat energy change at constant pressure

2
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Enthalpy of formation

the enthalpy change when 1 mole of a compound is formed from its elements in their standard states

H2 + 0.5 O2 —> H2O

3
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Enthalpy of combustion

the enthalpy change when 1 mole of a compound is burned completely in oxygen

CH4 + 2O2 —> CO2 + 2H2O

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bond enthalpy

average enthalpy needed to break 1 mole of that type of chemical bond to form individual atoms. All compounds in gaseous state

C-H —> C + H

C-C —> C + C

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Enthalpy of ionisation

enthalpy change when 1 mole of electrons is removed from 1 mole of atoms in their gaseous state