When enthalpy of reactants is higher than product then reaction will be_________________?
Correct answer: D. exothermic
- A. endothermic
- B. spontaneous
- C. non-spontaneous
- D. exothermic
Explanation
If the reactants have greater enthalpy than the products, ΔH = Hproducts - Hreactants is negative, so heat is released and the reaction is exothermic. Students may choose spontaneous because the products are lower in enthalpy, but enthalpy change alone does not determine spontaneity.
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About Exothermic and Endothermic Reactions
Exothermic reactions release heat to the surroundings and have negative enthalpy change, while endothermic reactions absorb heat and have positive enthalpy change. The topic uses energy profiles to identify reactants, products and activation energy, and includes bond energy, enthalpy diagrams, calorimetry and Hess's law for calculating overall heat changes.
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