The Energy of Chemical Reactions — Test

Question 22 • 26-27 - C - RUSD Chemistry in the Earth System

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

Answer

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.

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.

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.

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.

Explanation

Diamond has higher energy than graphite, so converting graphite into diamond is nonspontaneous and the product energy must be higher than the reactant energy. Graph A starts at a low energy and ends at a higher energy level, showing this increase. The other graphs end below their starting energy levels.

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