PU M 2026 Thermochemistry Free Quiz 1

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PU M 2026 Thermochemistry Free Quiz 1

PU M Quiz

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General 10 MCQs

1. What are surroundings in thermochemistry?

A. The system B. Everything outside the system C. The boundary D. The universe

2. What type of system exchanges both matter and energy with surroundings?

A. Closed system B. Isolated system C. Open system D. Adiabatic system

3. What type of system exchanges neither matter nor energy?

A. Open system B. Closed system C. Adiabatic system D. Isolated system

4. What is enthalpy?

A. Total heat content at constant pressure B. Total heat content at constant volume C. Measure of disorder D. Maximum work available

5. What is ΔH?

A. Heat at constant volume B. Heat at constant pressure (ΔH) C. Entropy change D. Free energy change

6. What is an exothermic reaction?

A. Endothermic (ΔH positive) B. No heat change C. Exothermic (ΔH negative) D. Variable

7. What is standard enthalpy of formation?

A. Enthalpy change for formation of 1 mole of compound from elements B. Enthalpy change for combustion C. Enthalpy change for any reaction D. Energy required to break a bond

8. What is the standard enthalpy of formation of an element?

A. Positive B. Zero C. Negative D. Variable

9. What does Hess's law state?

A. Depends only on initial and final states B. Depends on the path taken C. Varies with temperature D. Depends on the catalyst

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

A. Conservation of mass B. Conservation of energy C. Conservation of charge D. Conservation of momentum

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