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Which statement describes the changes in bonding and energy that occur when a molecule of iodine, I2

NYC Chemistry Regents Exam Jan 2023


Which statement describes the changes in bonding and energy that occur when a molecule of iodine, I2, forms two separate atoms of iodine? (1) A bond is formed as energy is absorbed.

(2) A bond is formed as energy is released.

(3) A bond is broken as energy is absorbed.

(4) A bond is broken as energy is released.


Solution: When a molecule of iodine I2 is broken into two atoms of iodine, the bond is broken. Breaking a bond means energy must be absorbed. Choice 3 is correct.


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