Entropy Key Points and Definitions

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1. Standard entropy change of reaction, ΔSº, is

  • The entropy change that accompanies a reaction in the molar quantities as expressed in a chemical equation under standard conditions, all in standard states
  • S is always a positive number
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2. All substances posess some degree of disorder because particles are in constant motion, thus

  • S is always a positive number
  • Decreases

3. In calculations concerning ΔG= ΔH - TΔS entropy is worked out using K

  • To convert C to K add 273 and the opposite to convert K to C
  • The entropy change that accompanies a reaction in the molar quantities as expressed in a chemical equation under standard conditions, all in standard states

4. For an endothermic reaction to take place spontaneously, ΔS must be positive, and the temperature must be high enough so that

  • The balance between enthalpy, entropy, and temperature for a process: ΔG = ΔH - TΔS
  • TΔS>ΔH
  • TΔS

5. The standard entropy change of a reaction can be calculated using the standard entropies of the reactants and products:

  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)
  • The entropy content of one mole of the substance under standard conditions

Comments

Lizzie Keys

This is quite helpful but the answers are obvious when only one option makes sense. Hehe.

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