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Systems, Surroundings, Heat, and Work
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Grade Level
Chemistry
11.75 Systems, Surroundings, Heat, and Work
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A chemist analyzes a reaction two ways. Boundary 1 includes only the reacting molecules. Boundary 2 includes the reacting molecules plus the solvent. Which claim is best?
A
The numerical value of Delta U must be identical for both boundaries.
B
The classification of some energy transfers can change because the system boundary changed.
C
The solvent must be surroundings in all thermochemistry analyses.
D
Changing boundaries changes the chemical reaction that occurs.
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