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Thermodynamics Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. The heat of reaction is -85.0 kJ and the entropy change for the reaction is +9.50 J/K. At 298K, what is the value of Delta G, and will the process be spontaneous or non-spontaneous?

Question 2 2. If Delta G standard is zero, this means...

Question 3 3. For a reaction to be spontaneous, the sign of delta G is:

Question 4 4. Calculate the Standard Free Energy Change at 25 degrees celsius given the Equilibrium constant of 1.3 x 10^4.

Question 5 5. Calculate the equilibrium constant at 25 degrees celsius given the Standard Free Energy value of - 107.2 kJ

Page 2

Question 6 6. For a reaction to be spontaneous, the sign of delta G must be:

Question 7 7. The method by which nutritionists determine the energy content of food is known as the _____.

Question 8 8. Why can it never be assumed that all spontaneous processes happen quickly?

Question 9 9. A(n) _____ reaction absorbs heat from the surroundings, while an _____ reaction results in heat flowing out of the system.

Question 10 10. If Delta G is greater than about + 20 kJ this means...

Page 3

Question 11 11. Which of the following substances has the highest entropy at 25°C?

Question 12 12. What does a positive cell potential tell you?

Question 13 13. What is a state change?

Question 14 14. What is oxidation?

Question 15 15. Why is work a path function?

Page 4

Question 16 16. Which statement is correct about heat?

Question 17 17. Which of the following is TRUE of a thermochemical equation?

Question 18 18. Which of the following is NOT a state function?

Question 19 19. When manipulating thermochemical equations, if I divide the coefficients of the chemical reaction of one step by 3, then what do I need to do to the enthalpy change value?

Question 20 20. When working with free energy, standard conditions are defined as which of the following?

Page 5

Question 21 21. The order of entropy levels in different phases from lowest to highest is:

Question 22 22. Which of the following has a positive entropy change?

Question 23 23. The science of measuring heat transfer when a substance gives out or absorbs heat is known as _____, while the device that is used to experimentally determine the heat associated with a chemical reaction is called a _____.

Question 24 24. Which of the following would have a positive value for ΔS?

Question 25 25. What is the main principle of the First Law of Thermodynamics?

Page 6

Question 26 26. Which one of the following is the correct equation linking free energy and the cell potential?

Question 27 27. Why are bodies of water, such as lakes, relatively slow to respond to heating or cooling compared to the land surrounding them?

Question 28 28.

For the reaction Xe(g) + 2F2(g) → XeF4(g)

the enthalpy change is delta H = -251 kJ.

If I wanted to make twice the amount of the products from twice as much reactants, what would be the value of delta H?

Question 29 29. The enthalpy change of a reaction can be calculated using the following equation:

Question 30 30. What's a state function?

Thermodynamics Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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