A Level Chemistry OCR Practice Exam

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Which of the following is NOT a characteristic of an exothermic reaction?

  1. The enthalpy change is negative

  2. Energy is released to the surroundings

  3. The products have greater enthalpy than the reactants

  4. Temperature of the surroundings increases

The correct answer is: The products have greater enthalpy than the reactants

The choice that indicates a characteristic that is NOT associated with an exothermic reaction is one that states the products have greater enthalpy than the reactants. In exothermic reactions, energy is released to the surroundings, resulting in a decrease in the enthalpy of the system. This means the products end up with a lower enthalpy compared to the reactants, leading to a negative enthalpy change. The other characteristics accurately describe exothermic reactions: a negative enthalpy change signifies that energy is released; energy being released to the surroundings contributes to an increase in the temperature of the surroundings due to the warmth generated by the reaction. Thus, the correct understanding of enthalpy in exothermic reactions confirms why the statement regarding products having greater enthalpy than the reactants does not align with their fundamental nature.

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