Regents Chemistry Exam August 2025 Question 21 22  When a catalyst is added to a chemical reaction it produces (1) a greater heat of reaction (2) a greater activation energy for the reactants (3) an alternate reaction pathway (4) an alternate potential energy for the products Solution: A catalyst speeds up the reaction by lowering its activation energy and providing an alternate reaction pathway. Choice 3 is the correct answer. LINKS: Regents Chemistry Guides and Solutions Ch

Regents Chemistry Exam August 2025 Question 21 21 Which expression represents the heat of reaction for a chemical change? (potential energy of the products) - (potential energy of the reactants) (potential energy of the products) + (potential energy of the reactants) (kinetic energy of the products) - (kinetic energy of the reactants) (kinetic energy of the products) + (kinetic energy of the reactants) Solution: Heat of reactions is equal to the potential energy of the produc