Energy Transfer - Light Energy Taken In

For molecule B to undergo a chemical reaction that transforms it into molecule A, energy must be given to molecule B. In some cases, energy in the form of light can cause molecules to change from one form to another. This is true for molecules A and B below. By shining light on molecule B, the energy needed to transform it to A is provided and the reaction takes place. Light energy is absorbed by molecule B in this reaction. Based on this information, click on the molecule that has greater energy.

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