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It is false that in an energy diagram for a chemical reaction, energy is plotted along the x-axis (the horizontal axis) and reaction progress is plotted along the y-axis (the vertical axis). The energy is actually plotted along the y-axis and the reaction along the x-axis.
This example problem demonstrates how to determine the activation energy of a reaction from reaction rate constants at different temperatures. Problem: A second-order reaction was observed. The reaction rate constant at 3 Â°C was found to be 8.9 x 10 -3 L/mol and 7.1 x 10 -2 L/mol at 35 Â°C.