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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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Presentation Transcript
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
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.
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