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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.
The potential energy (enthalpy) diagram for an exothermic reaction is shown below: The activation energy [Activation energy: The minimum energy required for a collision between particles, in order for a reaction to occur. ] (E a) for the forward reaction is shown by (A): E a (forward) = H (activated complex) - H (reactants) = 200 - 150 = 50 kJ mol-1