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A chemical reaction involving 3 atoms and two types of bonds, A and B, is shown here. A B B The Lennard-Jones potential energy graphs of bonds A and B are shown below. Both graphs have the same scale. U(en) U (ev) -21 -6 -86 -10 Bond A Bond B Select the correct statements: In this reaction, [ Select ] The reaction is [ Select ] The magnitude of the chemical energy change is [ Select ]