Entropy Key Points and Definitions

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1. In a reaction where there is an increase in the number of gaseous molecules, entropy

  • Decreases
  • Increases
  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)
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2. In calculations concerning ΔG= ΔH - TΔS 1, units must be the same for kJ/J

  • The units need to be the same, to convert ΔS to kJ K^-1 mol^-1 /1000
  • TΔS

3. The free energy change ΔG is

  • The balance between enthalpy, entropy, and temperature for a process: ΔG = ΔH - TΔS
  • 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. Entropy ______ when a solid lattice dissolves

  • S is always a positive number
  • Increases
  • Decreases

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

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