Practice Exercises (5.8) - Thermodynamics

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6 sample questions

Question 1.
What is the relationship between internal energy, heat, and work?
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Consider the terms in the first law of thermodynamics.
Question 2.
Define exothermic and endothermic reactions.
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Remember how each affects the enthalpy change.
3Question 3.
What is the formula for calculating the change in internal energy?
- A) ∆U = q - w
- B) ∆U = q + w
- C) ∆U = w - q
- D) ∆U = q * w
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Recall the definition related to thermodynamic laws.
4Question 4.
In which type of reaction is ∆H negative?
- True
- False
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Think about the definitions of enthalpy change.
Question 5.
A gas expands in a piston from 10 to 20 liters at a constant pressure of 2 atm, while absorbing 5 kJ of heat. Calculate the change in internal energy.
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Remember to convert units when calculating work.
Question 6.
During a reaction, 1.0 mol of gas undergoes a change in enthalpy of +40 kJ at constant pressure. If 15 kJ of heat is released, calculate the change in internal energy.
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Be sure to pay attention to the positive and negative signs while calculating.

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