Free energy change at equilibrium is...
AP Chem Thermodynamics Practice

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•
Chemistry
•
11th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
Zero
2.
FLASHCARD QUESTION
Front
For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔHΟ and ΔSΟ must be __________ and __________, respectively.
Back
-, +
3.
FLASHCARD QUESTION
Front
Thermodynamically unfavorable reactions...
Back
occur only with a sustained energy input
4.
FLASHCARD QUESTION
Front
The entropy will usually increase when
Back
all of these (a molecule is broken into two or more smaller molecules, a reaction occurs that results in an increase in the number of moles of gas, a solid changes to a liquid)
5.
FLASHCARD QUESTION
Front
As a sample of solid iodine sublimes, the entropy of the sample
Back
increases because the particles are more randomly arranged
6.
FLASHCARD QUESTION
Front
Define enthalpy (ΔH).
Back
The heat content of a system at constant pressure.
7.
FLASHCARD QUESTION
Front
What is the second law of thermodynamics?
Back
The total entropy of an isolated system can never decrease over time.
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