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MTEL Middle School Math/Science: Thermodynamics in Chemistry 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!

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Question 1 1. 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 2 2. When energy is unavailable to be used it is called _____.

Question 3 3. Which of the following is NOT a reason that state functions are important in chemistry?

Question 4 4.

Use the following bond energies to calculate the overall energy change of the reaction:

CH4 + 2O2 -----> CO2 + 2H2O

C-H: 413 kJ/mol; O=O: 498 kJ/mol; C=O: 799 kJ/mol; O-H: 467 kJ/mol

Question 5 5. Which of the following is FALSE of Hess's Law?

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Question 6 6. _____ is a measure of the random motion of particles. _____ is the transfer of energy between two objects due to temperature difference.

Question 7 7. Express 55.3 J of heat (or energy) in units of calories.

Question 8 8. Why are bodies of water, such as lakes, relatively slow to respond to heating or cooling compared to the land surrounding them?

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

Question 10 10. Which statement is correct about heat?

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Question 11 11. Which chemical bond has the highest bond energy?

Question 12 12. The method by which nutritionists determine the energy content of food is known as the _____.

Question 13 13. A(n) _____ reaction absorbs heat from the surroundings, while an _____ reaction results in heat flowing out of the system.

Question 14 14. Which of the following concepts best describes a chlorophyll molecule absorbing light and changing it into chemical energy?

Question 15 15. How much energy does it take to heat 75 grams of water from 50 to 70°C?

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Question 16 16. During a chemical reaction, the following occurs

Question 17 17. What's a state function?

Question 18 18. What is a state change?

Question 19 19.

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 20 20.

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)

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Question 21 21. What is the main principle of the First Law of Thermodynamics?

Question 22 22. An exothermic reaction

Question 23 23. Using the table of Average Bond Energies in the lesson, which bond is the strongest?

Question 24 24. The fact that energy can be neither created nor destroyed is _____.

Question 25 25. When something is moving it has _____ energy.

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Question 26 26.

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 27 27. Which of the following is TRUE of a thermochemical equation?

Question 28 28. Why is work a path function?

Question 29 29. 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 30 30. Which of the following is NOT a state function?

MTEL Middle School Math/Science: Thermodynamics in Chemistry 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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