Thermodynamics: Spontaneity

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Chemistry

Thermodynamics

AP Chemistry

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8 Terms

1
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+ ΔS (system), + ΔS (surroundings), + ΔS (universe)

Spontaneous

2
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- ΔS (system), - ΔS (surroundings), - ΔS (universe)

Non-spontaneous (rxn will occur in opposite direction)

3
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+ ΔS (system), - ΔS (surroundings)

Only spont. if ΔS (sys) has a larger magnitude than ΔS (surr)

4
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- ΔS (system), + ΔS (surroundings)

Only spont. if ΔS (sys) has a smaller magnitude than ΔS (surr)

5
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+ ΔH, - ΔS, + TΔS, + ΔG

Non-spontaneous

6
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- ΔH, + ΔS, - TΔS, - ΔG

Spontaneous

7
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- ΔH, - ΔS, + TΔS, +/- ΔG

Spont. at low temps, nonspont. at high temps

8
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+ ΔH, + ΔS, -TΔS, +/- ΔG

Spont. at high temps, nonspont. at low temps