Answers26-27 - C - RUSD Chemistry in the Earth SystemThe Energy of Chemical Reactions

The Energy of Chemical Reactions — Test Answers

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22
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Which energy graph represents the nonspontaneous transition of graphite into diamond?

A
Image with description A graph with Reaction progression on the horizontal axis and energy on the vertical axis. A line starts low on the vertical axis, runs briefly parallel to the horizontal axis, slopes up sharply, curves down a short distance, and levels out.
B
Image with description A graph with reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up sharply, curves down sharply, and levels out below the initial starting point.
C
Image with description A graph with reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up a moderate amount, then curves down sharply to level out below the initial starting point.
D
Image with description A graph with reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up a small amount, then curves down to level out below the initial starting point.
23
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Which is true about the potential energy of the reactants in this reaction pathway?

A
It is equal to the potential energy of the products.
B
It is greater than the potential energy of the products.
C
It is less than the potential energy of the products.
D
It is half of the potential energy of the products.
24

Which method would provide evidence to support the inference that this is an exothermic reaction?

A
add cap A and cap c
B
subtract cap e from cap d
C
add cap e and cap d
D
subtract A from cap c
25

Which label shows the overall enthalpy change and is the reaction exothermic or endothermic?

A
A, exothermic.
B
B, exothermic.
C
C, endothermic.
D
D, endothermic.

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