Chemical Cells and Fuel Cells Quiz
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5 questions, one answer each
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1. In a simple cell, two different metals are placed in an electrolyte solution. Which statement correctly describes how the voltage produced is related to the metals used?
- A. The greater the difference in reactivity between the metals, the greater the voltage produced
- B. The greater the similarity in reactivity between the metals, the greater the voltage produced
- C. The voltage produced is independent of which metals are chosen
- D. The voltage depends only on the concentration of the electrolyte, not on the metals
2. Which of the following best describes how chemical energy is converted to electrical energy in a simple cell?
- A. Heat from a chemical reaction causes electrons to move through the circuit
- B. A spontaneous redox reaction causes electrons to move from the negative to the positive terminal through an external circuit
- C. Mechanical energy from the reaction pushes electrons through the circuit
- D. Light energy produced by the reaction is converted into electricity
3. What is the key difference between rechargeable and non-rechargeable batteries in terms of their chemical reactions?
- A. Rechargeable batteries use stronger chemical reactions than non-rechargeable batteries
- B. Rechargeable batteries have reversible reactions, whilst non-rechargeable batteries have irreversible reactions
- C. Non-rechargeable batteries produce more voltage than rechargeable batteries
- D. Rechargeable batteries use different metals, whereas non-rechargeable batteries use the same metals
4. In a hydrogen fuel cell, hydrogen and oxygen react to produce water and generate electricity. Which statement correctly identifies an advantage and disadvantage of hydrogen fuel cells compared to rechargeable batteries?
- A. Fuel cells produce toxic fumes as a by-product; batteries do not require any infrastructure
- B. Fuel cells produce only water as a by-product, but require hydrogen infrastructure; batteries are more convenient as they use existing fuel networks
- C. Fuel cells last longer than batteries and require no maintenance
- D. Fuel cells are cheaper to manufacture than batteries and produce no emissions
5. The overall equation for a hydrogen fuel cell is 2H₂ + O₂ → 2H₂O. At the negative terminal (anode), hydrogen is oxidised. Which half-equation correctly represents the oxidation of hydrogen at the anode?
- A. 2H⁺ + 2e⁻ → H₂
- B. 2H₂ → 4H⁺ + 4e⁻
- C. O₂ + 4e⁻ → 2O²⁻
- D. 2H₂O → O₂ + 4H⁺ + 4e⁻