Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known. [Clarification Statement: Emphasis is on explaining the meaning of mathematical expressions for energy, work, and power used in the model.] [Assessment Boundary: Assessment is limited to basic algebraic expressions or computations; to systems of two or three components; and to work, power, thermal energy, kinetic energy, potential energy, electrical energy and/or the energies in gravitational, magnetic, or electric fields.]
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Q 1/20
Score 0
1. Why is hydrogen classified as an energy carrier rather than a primary energy source?
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It requires energy to be extracted from compounds like water or methane.
It is the most abundant element in the universe.
It directly powers fuel cells without processing.
It exists in pure form on Earth’s surface.
Q 2/20
Score 0
2. What is the balanced chemical equation for water electrolysis as described in the transcript?
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CH₄ + H₂O → 3H₂ + CO
2H₂O → 2H₂ + O₂
H₂ + O₂ → 2H₂O
2H₂O → H₂ + 2O₂
20 questions
Q.
1. Why is hydrogen classified as an energy carrier rather than a primary energy source?
1
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HS-PS3-1
Q.
2. What is the balanced chemical equation for water electrolysis as described in the transcript?
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3. What is the sole byproduct of electricity generation in a hydrogen fuel cell?
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30 sec
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4. What is the primary function of catalysts like platinum in a fuel cell?
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5. If a fuel cell operates at 80% efficiency, how much electrical energy is produced from 200 kJ of hydrogen energy?
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6. How much energy is lost as heat in a traditional car engine with a real-world efficiency of 25% if it consumes 400 kJ of fuel energy?
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7. What is a major challenge in storing hydrogen as a liquid?
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8. What percentage of Germany’s €7 billion hydrogen program investment is allocated if it constitutes 20% of its clean energy budget?
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9. Which type of hydrogen production has the highest carbon footprint?
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10. According to the transcript, how many large-scale hydrogen projects are currently underway worldwide?
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11. If a hydrogen fuel cell produces 100 kW of power at 80% efficiency, what is the rate of hydrogen energy consumption in kWh over 2 hours?
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12. In a fuel cell, what distinguishes the anode from the cathode compared to an electrolyzer?
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13. If a traditional engine’s theoretical efficiency is 50% but real-world efficiency is 25%, what fraction of potential efficiency is lost?
13
30 sec
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14. What is the primary environmental advantage of hydrogen fuel cells highlighted in the transcript?
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15. If a hydrogen truck travels 600 km and refuels in 6 minutes, how much faster is its refueling time per km compared to a battery truck charging 400 km in 40 minutes?
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16. What is the estimated global investment in hydrogen projects as per the transcript?
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17. If China has 20,000 fuel cell vehicles in 2023 and targets 1 million by 2030, what is the approximate annual growth rate needed over 7 years?
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18. Why does hydrogen’s high energy density benefit heavy vehicles?
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19. If a fuel cell system outputs 150 kW with 75% efficiency, how much hydrogen energy is consumed in 3 hours?
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20. What is the biggest infrastructure challenge for hydrogen adoption mentioned in the transcript?
