Which equation represents energy being absorbed as a bond is broken?

January 2019 NY Regents Chemistry Exam

12 Which equation represents energy being absorbed as a bond is broken?
(1) H+H→H2 +energy

(2) H + H + energy→H2

(3) H2 →H+H+energy

(4) H2 +energy→H+H

Solution: When H2 molecule breaks into two H atoms, the bond is broken. Energy needs to be absorbed to break a bond. We should see energy on the left side.

Answer: 4

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