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Praxis General Science: 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. If the boiling point of water increases with the addition of salt, how long would it take to boil pasta if you add a TON of salt?

Question 2 2. What does it mean when the enthalpy change for a reaction is negative?

Question 3 3. What happens to the melting and freezing point of water if salt is added?

Question 4 4. An endothermic reaction is:

Question 5 5. When something is moving it has _____ energy.

Page 2

Question 6 6. What does the linear coefficient of thermal expansion refer to?

Question 7 7. How is freezing similar to deposition?

Question 8 8.

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 9 9. How does adding energy to a solid change the substance?

Question 10 10. Choose the incorrect statement.

Page 3

Question 11 11. What is a heat engine?

Question 12 12. Temperature is the average _____ energy of particles of matter.

Question 13 13. The ability to do work is defined as ...

Question 14 14. Why does room temperature water disappear over time?

Question 15 15. During which stages of the Carnot Cycle is useful work extracted?

Page 4

Question 16 16. Which of the following is the best definition of thermal expansion?

Question 17 17. What is the Carnot Cycle?

Question 18 18. Why are there plateaus on a heating curve?

Question 19 19. Heat and temperature are _____.

Question 20 20. Which of the following concepts best describes a chlorophyll molecule absorbing light and changing it into chemical energy?

Page 5

Question 21 21. If you put a piece of chocolate in your mouth and it melts, what mechanism is used to melt the chocolate?

Question 22 22. What are the laws of thermodynamics?

Question 23 23. What accounts for the added heat energy when water boils?

Question 24 24. An example of an exothermic reaction is:

Question 25 25. Why do bridges need expansion joints?

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Question 26 26. When a bond forms, energy is given off to the surroundings. This is an example of

Question 27 27. Why does running a jar under hot water make it easier to open?

Question 28 28. If object A has a temperature of 50 degrees Celsius, and object A is in thermal equilibrium with objects B and C, which of the following statements can NOT be concluded from the zeroth law of thermodynamics?

Question 29 29. Two of the most common liquids that are used in thermometers are _____ and _____.

Question 30 30. Thermal expansion is _____.

Praxis General Science: 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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