12A: Entropy

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Last updated 8:11 PM on 9/8/26
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11 Terms

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entropy

measure of disorder of a system J mol-1 K-1

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entropy increase

  • with t

  • solid → liquid → (greater) gas

  • perfect crystals at 0 K = 0

  • big increase on state changes


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total entropy change

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entropy change of the system

  • +ve → increase in entropy - favourable

  • -ve → decrease in entropy


<ul><li><p>+ve → increase in entropy - <strong>favourable</strong></p></li><li><p>-ve → decrease in entropy</p></li></ul><p></p>
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entropy change of the surroundings

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feasibility of a reaction

possibility that reaction will occur spontaneously

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feasibility depends on

  • balance between S [system] and S [surroundings]

  • t (higher t decrease magnitude of S [surroundings], so its contribution to S [total] is less)


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reaction is thermodynamically feasibility if

S [total] is + ve

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exo or endo more favourable

exo

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why S [system] -ve

  • moles decrease

  • decrease in disorder


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why high Ea

  • bonding/electrostatic attraction is strong

or

  • large amount of energy needed to break bonds in …