Answer: Drive non-spontaneous chemical reactions.
- A Generate electricity from a spontaneous redox reaction
- B Drive non-spontaneous chemical reactions
- C Catalyse the formation of acids from elemental gases
- D Selectively remove ions via a salt bridge
Correct answer: B. Drive non-spontaneous chemical reactions
Explanation: Electrolysis uses electrical energy to force non-spontaneous reactions (decomposition) to occur.
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.