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

  • S is always a positive number
  • Decreases

7. 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

8. 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

9. 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

10. The more disorder there is in the system, the

  • S is always a positive number
  • Higher the entropy
  • Decreases

11. 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

12. 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

13. The standard entropy S, of a substance is

  • The entropy content of one mole of the substance under standard conditions
  • S is always a positive number