Problem: A friend studies a first-order reaction and obtains the following three graphs for experiments done at two different temperatures.Which two graphs represent experiments done at the same temperature? What accounts for the difference in these two graphs? In what way are they the same?

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A friend studies a first-order reaction and obtains the following three graphs for experiments done at two different temperatures.
A graph has time on the x-axis and natural log of the concentration of A on the y-axis; both are unscaled. Lines 1, 2 and 3 decrease from the y-axis, with 2 and 3 starting at the same point and 1 starting lower. 3 has the flattest slope and 1 and 2 are parallel.

Which two graphs represent experiments done at the same temperature? What accounts for the difference in these two graphs? In what way are they the same?

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