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Entropy

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

  2. 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

  3. Entropy change for reactions

  4. Predicting entropy changes

  5. 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.

  6. Calculating entropy changes

  7. Entropy change calculations

  8. What is a spontaneous reaction?

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