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This deck focuses on Hydrogen Fuel Cell, giving you a quick way to review the definitions, rules, and examples that matter most for AP Environmental Science.
AP Environmental Science Flashcards: Hydrogen Fuel Cell
Study Hydrogen Fuel Cell in AP Environmental Science with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Environmental Science
Hydrogen Fuel Cell
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QUESTION
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What is the primary purpose of a hydrogen fuel cell?
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ANSWER
To convert chemical energy into electrical energy. Converts hydrogen's chemical bonds into usable electricity through electrochemical reactions.
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Flashcard 1: What is the primary purpose of a hydrogen fuel cell?
Answer: To convert chemical energy into electrical energy. Converts hydrogen's chemical bonds into usable electricity through electrochemical reactions.
Flashcard 2: What is the efficiency range of hydrogen fuel cells?
Answer: Typically 40% to 60% efficient. Higher than internal combustion engines due to direct energy conversion.
Flashcard 3: What is the byproduct of a hydrogen fuel cell?
Answer: Water is the byproduct. The only emission from the electrochemical reaction between hydrogen and oxygen.
Flashcard 4: Identify a disadvantage of using platinum in fuel cells.
Answer: Platinum is expensive and scarce. High cost and limited supply make platinum catalysts expensive.
Flashcard 5: Identify one application of hydrogen fuel cells.
Answer: They are used in transportation, such as fuel cell vehicles. Cars, buses, and trucks can run on hydrogen fuel cells for zero emissions.
Flashcard 6: What is the advantage of hydrogen fuel cells in terms of noise pollution?
Answer: They operate quietly. No moving parts or combustion makes fuel cells nearly silent.
Flashcard 7: What is a challenge of storing hydrogen for fuel cells?
Answer: Hydrogen has low energy density per volume. Gaseous hydrogen requires high-pressure tanks or cryogenic storage.
Flashcard 8: Which component of the fuel cell lets protons pass but not electrons?
Answer: The proton exchange membrane (PEM). Selective permeability allows ionic conduction while blocking electrons.
Flashcard 9: State the main advantage of hydrogen fuel cells over fossil fuels.
Answer: They produce no harmful emissions. Only water vapor is emitted, unlike fossil fuels that release greenhouse gases.
Flashcard 10: What is the role of the electrolyte in a hydrogen fuel cell?
Answer: It conducts protons from anode to cathode. Facilitates proton transport while maintaining electrical separation.
Flashcard 11: What is a common method of producing hydrogen for fuel cells?
Answer: Electrolysis of water is common. Electric current splits water molecules into hydrogen and oxygen gases.
Flashcard 12: Identify an alternative to platinum as a catalyst in fuel cells.
Answer: Nickel or cobalt can be alternatives. Lower-cost metals being developed to replace expensive platinum.
Flashcard 13: Which gas is released as a waste product in traditional combustion engines?
Answer: Carbon dioxide (CO2) is released. Burning fossil fuels produces CO2 as a major greenhouse gas emission.
Flashcard 14: What is the main challenge in using hydrogen fuel cells?
Answer: The storage and transportation of hydrogen. Hydrogen is highly flammable and requires specialized containment systems.
Flashcard 15: What is the main environmental advantage of hydrogen fuel cells?
Answer: Reduction in air pollution. Zero harmful emissions improve urban air quality significantly.
Flashcard 16: Identify the environmental benefit of using hydrogen fuel cells.
Answer: They reduce greenhouse gas emissions. Water vapor emission instead of CO2 helps combat climate change.
Flashcard 17: Identify a disadvantage of using platinum in fuel cells.
Answer: Platinum is expensive and scarce. High cost and limited supply make platinum catalysts expensive.
Flashcard 18: What is the anode reaction in a hydrogen fuel cell?
Answer: 2H2→4H++4e−. Hydrogen molecules lose electrons at the anode, becoming protons.
Flashcard 19: What is the role of the bipolar plates in a fuel cell?
Answer: They conduct electrons and distribute gases. Manage electrical current flow and distribute reactant gases evenly.
Flashcard 20: State the main advantage of hydrogen fuel cells over fossil fuels.
Answer: They produce no harmful emissions. Only water vapor is emitted, unlike fossil fuels that release greenhouse gases.
Flashcard 21: What is the role of the catalyst in a hydrogen fuel cell?
Answer: It speeds up the chemical reaction. Lowers activation energy needed for hydrogen oxidation and oxygen reduction.
Flashcard 22: What is the typical voltage output of a single hydrogen fuel cell?
Answer: Approximately 0.7 volts per cell. Standard output for proton exchange membrane fuel cells under normal conditions.
Flashcard 23: Name the catalyst often used in hydrogen fuel cells.
Answer: Platinum is often used as a catalyst. Platinum's properties make it highly effective for fuel cell reactions.
Flashcard 24: Identify the environmental benefit of using hydrogen fuel cells.
Answer: They reduce greenhouse gas emissions. Water vapor emission instead of CO2 helps combat climate change.
Flashcard 25: How are hydrogen fuel cells different from batteries?
Answer: Fuel cells require a continuous supply of fuel. Batteries store energy internally; fuel cells need external fuel input.
Flashcard 26: What is the energy source for electrolysis of water?
Answer: Electricity is the energy source. Electric current provides energy to break water's molecular bonds.
Flashcard 27: What is the energy source for electrolysis of water?
Answer: Electricity is the energy source. Electric current provides energy to break water's molecular bonds.
Flashcard 28: What kind of energy transformation occurs in a hydrogen fuel cell?
Answer: Chemical energy to electrical energy. Direct conversion without thermal combustion intermediates.
Flashcard 29: Which sector benefits from using hydrogen fuel cells for cleaner energy?
Answer: The transportation sector benefits. Vehicles can achieve zero local emissions using hydrogen power.
Flashcard 30: What is the byproduct of a hydrogen fuel cell?
Answer: Water is the byproduct. The only emission from the electrochemical reaction between hydrogen and oxygen.
Flashcard 31: What is the role of the electrolyte in a hydrogen fuel cell?
Answer: It conducts protons from anode to cathode. Facilitates proton transport while maintaining electrical separation.
Flashcard 32: Which pollutant is not produced by hydrogen fuel cells?
Answer: Nitrogen oxides (NOx) are not produced. Clean electrochemical process avoids high-temperature combustion pollutants.
Flashcard 33: What type of fuel cell is most common in vehicles?
Answer: Proton exchange membrane fuel cell (PEMFC). Low operating temperature and compact design suit automotive applications.
Flashcard 34: What is the energy density of hydrogen compared to gasoline?
Answer: Hydrogen has a higher energy density by weight. Hydrogen contains more energy per kilogram than gasoline.
Flashcard 35: Which component of the fuel cell lets protons pass but not electrons?
Answer: The proton exchange membrane (PEM). Selective permeability allows ionic conduction while blocking electrons.
Flashcard 36: What is the main component of the exhaust from a hydrogen fuel cell?
Answer: Water vapor is the main component. Clean water vapor is the only emission from hydrogen fuel cells.
Flashcard 37: What is a benefit of hydrogen fuel cells in space applications?
Answer: They provide water as a byproduct. Astronauts can drink the water produced as a valuable resource.
Flashcard 38: What is the anode reaction in a hydrogen fuel cell?
Answer: 2H2→4H++4e−. Hydrogen molecules lose electrons at the anode, becoming protons.
Flashcard 39: In a hydrogen fuel cell, what carries electrons from anode to cathode?
Answer: An external circuit carries the electrons. Electrons flow through the external circuit to complete the electrical loop.
Flashcard 40: Which two elements are essential in a hydrogen fuel cell?
Answer: Hydrogen and oxygen are essential. Hydrogen provides protons and electrons, oxygen accepts them to form water.
Flashcard 41: Describe the efficiency of hydrogen fuel cells compared to combustion engines.
Answer: Fuel cells are generally more efficient. Fuel cells convert energy directly without combustion losses.
Flashcard 42: What is the cathode reaction in a hydrogen fuel cell?
Answer: O2+4H++4e−→2H2O. Oxygen gains electrons and protons at the cathode to form water.
Flashcard 43: What is the role of the bipolar plates in a fuel cell?
Answer: They conduct electrons and distribute gases. Manage electrical current flow and distribute reactant gases evenly.
Flashcard 44: What kind of energy transformation occurs in a hydrogen fuel cell?
Answer: Chemical energy to electrical energy. Direct conversion without thermal combustion intermediates.
Flashcard 45: What is the role of the catalyst in a hydrogen fuel cell?
Answer: It speeds up the chemical reaction. Lowers activation energy needed for hydrogen oxidation and oxygen reduction.
Flashcard 46: What is the chemical reaction formula in a hydrogen fuel cell?
Answer: 2H2+O2→2H2O+electricity. Shows hydrogen and oxygen combining to produce water and electrical energy.
Flashcard 47: What is a challenge of storing hydrogen for fuel cells?
Answer: Hydrogen has low energy density per volume. Gaseous hydrogen requires high-pressure tanks or cryogenic storage.
Flashcard 48: What type of fuel cell is most common in vehicles?
Answer: Proton exchange membrane fuel cell (PEMFC). Low operating temperature and compact design suit automotive applications.
Flashcard 49: Identify the main component used as a fuel in hydrogen fuel cells.
Answer: Hydrogen gas is the main fuel component. Hydrogen gas provides the protons and electrons needed for the reaction.
Flashcard 50: Identify one application of hydrogen fuel cells.
Answer: They are used in transportation, such as fuel cell vehicles. Cars, buses, and trucks can run on hydrogen fuel cells for zero emissions.
Flashcard 51: What is the advantage of hydrogen fuel cells in terms of noise pollution?
Answer: They operate quietly. No moving parts or combustion makes fuel cells nearly silent.
Flashcard 52: Name the catalyst often used in hydrogen fuel cells.
Answer: Platinum is often used as a catalyst. Platinum's properties make it highly effective for fuel cell reactions.
Flashcard 53: What is the typical operating temperature for PEM fuel cells?
Answer: Around 80°C (176°F). Optimal temperature for efficient proton conduction in the membrane.
Flashcard 54: Which pollutant is not produced by hydrogen fuel cells?
Answer: Nitrogen oxides (NOx) are not produced. Clean electrochemical process avoids high-temperature combustion pollutants.
Flashcard 55: What is the efficiency range of hydrogen fuel cells?
Answer: Typically 40% to 60% efficient. Higher than internal combustion engines due to direct energy conversion.
Flashcard 56: What is the energy density of hydrogen compared to gasoline?
Answer: Hydrogen has a higher energy density by weight. Hydrogen contains more energy per kilogram than gasoline.
Flashcard 57: Which gas is released as a waste product in traditional combustion engines?
Answer: Carbon dioxide (CO2) is released. Burning fossil fuels produces CO2 as a major greenhouse gas emission.
Flashcard 58: What is the primary purpose of a hydrogen fuel cell?
Answer: To convert chemical energy into electrical energy. Converts hydrogen's chemical bonds into usable electricity through electrochemical reactions.
Flashcard 59: Identify a key limitation of hydrogen production via electrolysis.
Answer: It is energy-intensive and costly. Requires significant electrical input, making it expensive to operate.
Flashcard 60: Which sector benefits from using hydrogen fuel cells for cleaner energy?
Answer: The transportation sector benefits. Vehicles can achieve zero local emissions using hydrogen power.
Flashcard 61: What is the typical operating temperature for PEM fuel cells?
Answer: Around 80°C (176°F). Optimal temperature for efficient proton conduction in the membrane.
Flashcard 62: What is the main environmental advantage of hydrogen fuel cells?
Answer: Reduction in air pollution. Zero harmful emissions improve urban air quality significantly.
Flashcard 63: What is the chemical reaction formula in a hydrogen fuel cell?
Answer: 2H2+O2→2H2O+electricity. Shows hydrogen and oxygen combining to produce water and electrical energy.
Flashcard 64: What is a common method of producing hydrogen for fuel cells?
Answer: Electrolysis of water is common. Electric current splits water molecules into hydrogen and oxygen gases.
Flashcard 65: Identify the main component used as a fuel in hydrogen fuel cells.
Answer: Hydrogen gas is the main fuel component. Hydrogen gas provides the protons and electrons needed for the reaction.
Flashcard 66: In a hydrogen fuel cell, what carries electrons from anode to cathode?
Answer: An external circuit carries the electrons. Electrons flow through the external circuit to complete the electrical loop.
Flashcard 67: What is the cathode reaction in a hydrogen fuel cell?
Answer: O2+4H++4e−→2H2O. Oxygen gains electrons and protons at the cathode to form water.
Flashcard 68: Describe the efficiency of hydrogen fuel cells compared to combustion engines.
Answer: Fuel cells are generally more efficient. Fuel cells convert energy directly without combustion losses.
Flashcard 69: Identify an alternative to platinum as a catalyst in fuel cells.
Answer: Nickel or cobalt can be alternatives. Lower-cost metals being developed to replace expensive platinum.
Flashcard 70: What is a benefit of hydrogen fuel cells in space applications?
Answer: They provide water as a byproduct. Astronauts can drink the water produced as a valuable resource.
Flashcard 71: Which part of the hydrogen fuel cell separates hydrogen and oxygen?
Answer: The proton exchange membrane (PEM). Selectively allows protons to pass while blocking electrons and gases.
Flashcard 72: How are hydrogen fuel cells different from batteries?
Answer: Fuel cells require a continuous supply of fuel. Batteries store energy internally; fuel cells need external fuel input.
Flashcard 73: Which part of the hydrogen fuel cell separates hydrogen and oxygen?
Answer: The proton exchange membrane (PEM). Selectively allows protons to pass while blocking electrons and gases.
Flashcard 74: What is the typical voltage output of a single hydrogen fuel cell?
Answer: Approximately 0.7 volts per cell. Standard output for proton exchange membrane fuel cells under normal conditions.
Flashcard 75: What is the main challenge in using hydrogen fuel cells?
Answer: The storage and transportation of hydrogen. Hydrogen is highly flammable and requires specialized containment systems.
Flashcard 76: Which two elements are essential in a hydrogen fuel cell?
Answer: Hydrogen and oxygen are essential. Hydrogen provides protons and electrons, oxygen accepts them to form water.
Flashcard 77: What is the main component of the exhaust from a hydrogen fuel cell?
Answer: Water vapor is the main component. Clean water vapor is the only emission from hydrogen fuel cells.
Flashcard 78: Identify a key limitation of hydrogen production via electrolysis.
Answer: It is energy-intensive and costly. Requires significant electrical input, making it expensive to operate.