Chemistry A2:Chemical Energetics

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9 Terms

1
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Standard Enthalpy of Atomisation

enthalpy change when 1mole of gaseous atoms formed from its elements at standard state of 298K and 1atm

(Always Endothermic)

2
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Lattice Energy

Energy change when 1 mole of an ionic solid is fomed from its gaseous ions under standard conditions

(always exothermic)

3
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Electron Affinity

measure of attraction between nucleus and incoming electron

4
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1st Electron Affinity

Energy change when 1 mole of gaseous atoms gains 1 mole of electrons.

(always exothermic)

5
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2nd Electron Affinity

Energy change when 1 mole of gaseous 1- ion gains one mole of electron

6
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Enthalphy of Hydration

Energy change when 1 mole of gaseous ions is dissolved in water

(always exothermic)

7
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Enthalpy of Solution

Energy change when 1 mole of ionic solid is dissolved in water

(can be endothermic/exothermic)

8
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Thermal Decomposition

Chemical decomposition caused by heat

9
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Entropy

Measure of disorder in the system