In which of the following type of reactions energy of reactant is greater than energy of product________________?
Correct answer: B. exothermic
- A. endothermic
- B. exothermic
- C. unpredictable
- D. same
Explanation
In an exothermic reaction, chemical energy is released to the surroundings, so the reactants have greater enthalpy than the products. The energy difference appears as heat released. A common mistake is choosing endothermic, in which the products have greater energy than the reactants.
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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.
Practise Thermochemistry and Energetics of Chemical Reactions
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