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HEC ETC - USAT GS Entry Test - Chemistry - Thermochemistry - Quiz 2

Practice 10 high yield MCQs on Chemistry from Chapter Thermochemistry for USAT GS Entry Test. After submission, get instant results with correct answers and detailed explanations. This is Quiz 2 of the series.

11. Which conservation law is Hess's law based on?



12. What is the application of Hess's law?



13. A → B: ΔH = +100 kJ; B → C: ΔH = -50 kJ. What is ΔH for A → C?



14. What is bond energy?



15. Is breaking a bond endothermic or exothermic?



16. What is the approximate bond energy of a C-H bond?



17. What is the approximate bond energy of an O-H bond?



18. How is enthalpy change estimated using bond energies?



19. What happens in an exothermic reaction?



20. What happens in an endothermic reaction?



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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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