Practice Important Thermodynamic Quantities (1.6.B) - Fuel Cells

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11 questions

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4 cards from this section. Quick, good the night before a test.
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6 questions · about 4 min · pass mark 70%. Hints available.
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5 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does ΔH represent in a fuel cell?
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Think about energy in terms of heat and work.
Question 2.
What does ΔG measure?
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Connect it to the efficiency of energy use.
3Question 3.
What is the equation for cell potential (E)?
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Recall the components that go into the cell potential calculation.
4Question 4.
Is ΔG always greater than ΔH?
- True
- False
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Reflect on what happens to energy in a practical scenario.
Question 5.
Given the data for a fuel cell with ΔH = 300 kJ and ΔG = 240 kJ at high pressure, calculate its theoretical efficiency and discuss how changing the operating conditions might affect this efficiency.
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Focus on what pressure does to reactions.
Question 6.
If a fuel cell operates at a non-ideal temperature leading to ΔH becoming 320 kJ while ΔG remains at 240 kJ, what can you infer about the efficiency and what strategies could improve it?
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Think about how you might keep the cell conditions optimal.

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