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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.
However, the energy curve goes up from the reactantsâ energy level to begin with, then drops to the productsâ energy level. This is because many reactions need an input of energy to start the reaction off. This is energy is called the activation energy. It is represented on an energy level diagram as the difference between the reactantsâ energy level and the top of the curve. For example, burning methane in a Bunsen burner: methane + oxygen â carbon dioxide + water.