A rechargeable voltaic cell can have its chemical energy restored by means of______________?
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Answer: B. by replacing external circuit with external source of electricity
Explanation
Rechargeable voltaic cells store electrical energy by driving non-spontaneous reverse reactions. Connecting the cell to an external electricity source forces electrons back through the circuit. This external current regenerates the original chemical reactants within the storage battery. Recharging converts electrical energy back into chemical potential energy for later discharge. Lead-acid and lithium-ion batteries represent common commercial rechargeable storage systems. Overcharging can cause unwanted side reactions, reducing the overall lifespan of the battery.
Electric vehicles rely on rechargeable battery packs that undergo thousands of charge cycles. Renewable energy solar installations use rechargeable battery banks to store excess electricity. Consumer electronics depend on quick-charging lithium-ion batteries for daily mobile utility. Adding fresh solution does not restore sealed rechargeable batteries like lead-acid units. Removing solution would deplete necessary electrolyte ions rather than restoring chemical energy. Heating the battery adds thermal energy but fails to reverse electrochemical redox reactions.
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Answer: B. Hydrogen
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Answer: D. all of the above
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Q4. Commercial urea utilized as a nitrogenous fertilizer contains:____________?
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Answer: C. 46% N
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Q5. A discrete molecule of water possesses a structure that is________?
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Answer: A. V-shaped
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Answer: D. None of them
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