Which of the following formations is an endothermic reaction?
Correct answer: C. 2H2O(l) → 2H2(g) + O2(g)
- A. C(g) + O2(g) → CO2(g)
- B. N2(g) + 3H2(g) → 2NH3(g)
- C. 2H2O(l) → 2H2(g) + O2(g)
- D. None of the above
Explanation
Explanation:This reaction is endothermic reaction: 2H2O (l) → 2H2 + O2 This reaction is Exothermic reaction, not endothermic. This reaction is also exothermic reaction, not endothermic reaction.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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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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