Answer: recharged.
- A used only once
- B recharged
- C made only of zinc
- D built without metals
Correct answer: B. recharged
Explanation: A secondary cell (e.g. a lead-acid battery) is rechargeable by reversing the cell reaction.
In a Daniell cell, electrons flow externally from the zinc anode (oxidation) through the voltmeter to the copper cathode (reduction), while the salt bridge completes the circuit.
Concept context
Explore the link between chemical reactions and electricity. Covers galvanic cells, electrolysis, standard electrode potentials, the Nernst equation, and real-world applications like batteries and corrosion.