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Which statement describes the energy changes that occur as bonds are broken and formed during a chem

August 2018 NY Regents Chemistry Exam



12 Which statement describes the energy changes that occur as bonds are broken and formed during a chemical reaction?

(1) Energy is absorbed when bonds are both broken and formed.

(2) Energy is released when bonds are both broken and formed.

(3) Energy is absorbed when bonds are broken, and energy is released when bonds are formed.

(4) Energy is released when bonds are broken, and energy is absorbed when bonds are formed.




Solution: When a bond is broken, energy is needed to be put in. Forming a bond releases energy.

Answer: 3


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