Entropy Key Points and Definitions

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1. If a change makes a system more random ΔH is positive, and if a change makes a system more ordered, ΔS is

  • Negative
  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)
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2. 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

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

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

4. 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

5. All substances posess some degree of disorder because particles are in constant motion, thus

  • S is always a positive number
  • Decreases

Comments

Lizzie Keys

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

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