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Thermodynamics: AP Chemistry Lesson Plans 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. 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 2 2. Which of the following is NOT a state function?

Question 3 3.

2Ba(s) + O2(g) → 2BaO(s) deltaH = -1107.0 kJ

Ba(s) + CO2(g) + ½O2(g) → BaCO3(s) deltaH = - 822.5 kJ

Given the data above, calculate delta H for the following reaction:

BaCO3(s) → BaO(s) + CO2(g)

Question 4 4. When something is moving it has _____ energy.

Question 5 5. What's a state function?

Page 2

Question 6 6. Which of the following is FALSE about Hess's Law?

Question 7 7. Enthalpy change is

Question 8 8. The fact that energy can be neither created nor destroyed is _____.

Question 9 9. The enthalpy change of a reaction can be calculated using the following equation:

Question 10 10. What is a state change?

Page 3

Question 11 11. Why can it never be assumed that all spontaneous processes happen quickly?

Question 12 12. 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 13 13. How is the net change in entropy calculated?

Question 14 14. An example of an exothermic reaction is:

Question 15 15. When energy is unavailable to be used it is called _____.

Page 4

Question 16 16.

The second law of thermodynamics states that:

I. Energy can neither be created nor destroyed

II. All free energy cannot be converted into usable energy

III. The entropy of a system increases over time

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

Question 18 18.

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 19 19. Which of the following best describes a spontaneous reaction?

Question 20 20. The method by which nutritionists determine the energy content of food is known as the _____.

Page 5

Question 21 21. For a reaction to be spontaneous, the sign of delta G is:

Question 22 22. _____ is a measure of the random motion of particles. _____ is the transfer of energy between two objects due to temperature difference.

Question 23 23. Using water as an example, how is the spontaneity of a process affected by temperature?

Question 24 24. Which of the following is another term for the heat of reaction?

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

Page 6

Question 26 26. Which of the following would have a positive value for ΔS?

Question 27 27. Which of the following is NOT a reason that state functions are important in chemistry?

Question 28 28. For a reaction to be spontaneous, the sign of delta G must be:

Question 29 29. How much energy does it take to heat 75 grams of water from 50 to 70°C?

Question 30 30. The entropy of a system decreases when:

Thermodynamics: AP Chemistry Lesson Plans 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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