1.

Which one of the following statements best describes the enthalpy change of a reaction?

A. The energy released when chemical bonds are formed during a chemical reaction
B. The energy consumed when chemical bonds are broken during a chemical reaction
C. The difference between the energy released by bond formation and the energy consumed by bond cleavage during a chemical reaction
D. The increase in disorder of the system as a reaction proceeds
Answer» D. The increase in disorder of the system as a reaction proceeds


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