MTLE Chemistry: 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. Standard conditions for enthalpies of formation are

Question 2 2. Which of the following is TRUE of a thermochemical equation?

Question 3 3. The method by which nutritionists determine the energy content of food is known as the _____.

Question 4 4. 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 5 5. Which of the following best describes a spontaneous reaction?

Page 2

Question 6 6. Why is the zeroth law of thermodynamics important or necessary?

Question 7 7. Which of the following is FALSE of Hess's Law?

Question 8 8. The enthalpy change of a reaction can be calculated using the following equation:

Question 9 9. What's a state function?

Question 10 10. When something is moving it has _____ energy.

Page 3

Question 11 11. The order of entropy levels in different phases from lowest to highest is:

Question 12 12. What is thermodynamics?

Question 13 13. _____ is a measure of the random motion of particles. _____ is the transfer of energy between two objects due to temperature difference.

Question 14 14. The entropy of a system decreases when:

Question 15 15. For a reaction to be spontaneous, the sign of delta G must be:

Page 4

Question 16 16. Using the table of Average Bond Energies in the lesson, which bond is the strongest?

Question 17 17. Which of the following is NOT a state function?

Question 18 18. Express 55.3 J of heat (or energy) in units of calories.

Question 19 19. Which of the following substances has the highest entropy at 25°C?

Question 20 20. Which of the following has a positive entropy change?

Page 5

Question 21 21.

The amount of heat given off when 2.00 mols of Al2O3 (aluminum oxide) is formed under standard conditions is closest to _____.

(Δ H°f for Al2O3 = -1,676.7 kJ/mol.)

Question 22 22. Why are bodies of water, such as lakes, relatively slow to respond to heating or cooling compared to the land surrounding them?

Question 23 23. When a bond forms, energy is given off to the surroundings. This is an example of

Question 24 24. Enthalpy change is

Question 25 25. When energy is unavailable to be used it is called _____.

Page 6

Question 26 26. What are the laws of thermodynamics?

Question 27 27. 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 28 28.

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

Question 30 30. A(n) _____ reaction absorbs heat from the surroundings, while an _____ reaction results in heat flowing out of the system.

MTLE Chemistry: 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!

MTLE Chemistry: Practice & Study Guide  /  Science Courses
Support