PU E 2026 Thermochemistry Free Quiz 2

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PU E 2026 Thermochemistry Free Quiz 2

PU E Quiz

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Navigator 10 Q

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General 10 MCQs

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

A. Only for reactions that can be measured directly B. Only for exothermic reactions C. For reactions that cannot be measured directly D. Only for endothermic reactions

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

A. +150 kJ B. -150 kJ C. +50 kJ D. +50 kJ

13. Is enthalpy a state function?

A. Depends only on the state of the system B. Depends on the path taken C. Depends on the temperature D. Depends on the pressure

14. Is breaking a bond endothermic or exothermic?

A. Breaking bonds releases energy B. Breaking bonds requires energy C. Bond breaking has no energy change D. Bond forming requires energy

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

A. 100 kJ/mol B. 200 kJ/mol C. 413 kJ/mol D. 800 kJ/mol

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

A. 100 kJ/mol B. 200 kJ/mol C. 300 kJ/mol D. 463 kJ/mol

17. How is enthalpy change estimated using bond energies?

A. ΔH = Σ(bonds broken) - Σ(bonds formed) B. ΔH = Σ(bonds formed) - Σ(bonds broken) C. ΔH = Σ(bonds broken) + Σ(bonds formed) D. ΔH = Σ(bonds broken) × Σ(bonds formed)

18. What happens in an exothermic reaction?

A. Heat released, ΔH negative B. Heat absorbed, ΔH positive C. No heat change D. Variable

19. What happens in an endothermic reaction?

A. Heat released, ΔH negative B. Heat absorbed, ΔH positive C. No heat change D. Variable

20. Which is an example of an endothermic reaction?

A. Combustion B. Neutralization C. Respiration D. Photosynthesis

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