Experiment: A blue copper sulfate solution was electrolyzed using copper electrodes.Observation: The color of the solution remained unchanged, and copper deposited on the cathode.Question: What does this indicate?
Correct answer: C. Copper ions are transferred but concentration stays constant.
- A. Electrolysis converts copper to zinc
- B. No ion exchange occurs during electrolysis.
- C. Copper ions are transferred but concentration stays constant.
- D. Color change must occur in redox reactions
Explanation
This process is the transfer of copper from one electrode to the other.Anode (+): Copper dissolves into the solution: 𝐶u→𝐶u(𝑔)+2𝑒−, so it loses mass. Cathode (-): Copper ions deposit onto the electrode Cu²⁺+2e⁻→Cu(s), so it gains massBecause copper ions are replaced as quickly as they are removed, the concentration stays constant and the blue color does not fade. Hence, Option C is correct.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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