chem definitions

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Last updated 5:48 AM on 4/20/26
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9 Terms

1
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average bond enthalpy:

energy needed to break a 1 mole bond is gaseous molecule
END

2
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bond dissociation energy:

energy needed to break 1 mole bond in gaseous state
ENDO

3
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enthalpy of atomisation:

enthalpy change to break 1 mole of substance into its individual atoms

ENDO

4
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ionisation energy:

energy needed to remove 1 mole of e from 1 mole gaseous atoms
ENDO

5
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enthalpy of combustion:

energy released when 1 mole of compound burnt in standard conditions
EXO

6
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lattice enthalpy of formation:

energy change when 1 mole of ionic compound is separated into its individual gaseous ions
EXO

7
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e affinity

energy released when 1 mole of e is added to 1 mole gaseous atoms
the first one is exo, then its endo

8
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spontaneity

tendency for reaction occur on its own

9
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entropy

measure of distribution of energy in system