Which expression represents the heat of reaction for a chemical change?

Regents Chemistry Exam August 2025 Question 21

21 Which expression represents the heat of reaction for a chemical change?

1. (potential energy of the products) - (potential energy of the reactants)

2. (potential energy of the products) + (potential energy of the reactants)

3. (kinetic energy of the products) - (kinetic energy of the reactants)

4. (kinetic energy of the products) + (kinetic energy of the reactants)

Solution:

Heat of reactions is equal to the potential energy of the products - potential energy of the reactants. Choice 1 is the correct answer.

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