Entropy
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Entropy. http://www.youtube.com/watch?v=uQSoaiubuA0. Entropy. Entropy is a measure of disorder, and is given the symbol S . The units of S are: J K –1 mol –1. ordered. disordered. regular arrangement of particles. random arrangement of particles. low entropy. high entropy.

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Entropy

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Entropy

Entropy

http://www.youtube.com/watch?v=uQSoaiubuA0


Entropy1

Entropy

Entropy is a measure of disorder, and is given the symbol S. The units of S are: JK–1mol–1.

  • ordered

  • disordered

  • regular arrangement of particles

  • random arrangement of particles

  • low entropy

  • high entropy


Entropy change for reactions

Entropy change for reactions


Predicting entropy changes

Predicting entropy changes


Calculating entropy changes

Calculating entropy changes

Standard entropy changes for any chemical reaction or physical change can be calculated using the following simple expression:

DS = SSөproducts – SSөreactants

Remember the following points:

  • the units of entropy, S, are JK–1mol–1

  • entropies of elements are not zero like DHf values, so they should be included in calculations.


Calculating entropy changes1

Calculating entropy changes


Entropy change calculations

Entropy change calculations


What is a spontaneous reaction

What is a spontaneous reaction?


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