Electrolysis of Copper(II) Sulfate Quiz

What ions are present in the electrolysis of copper(II) sulfate?

• Magnesium ions and carbonate ions

• Potassium ions and nitrate ions

• Sodium ions and chloride ions

• Copper ions and sulfate ions

Which ions are discharged at the cathode when using carbon electrodes?

• Copper ions

• Hydroxide ions

• Hydrogen ions

• Sulfate ions

What is observed at the anode when using carbon electrodes?

• Release of oxygen gas

• Deposition of copper metal

• Formation of chlorine gas

• Formation of hydrogen gas

What happens to the copper electrode during electrolysis with copper electrodes?

• It remains unchanged

• It dissolves into the solution

• It forms a thick layer of copper

• It releases hydrogen gas

Why does the copper electrode become thinner during electrolysis?

• Copper ions are deposited on it

• It reacts to form copper ions

• It releases oxygen gas

• It absorbs water from the solution

What is the main difference in observation between using carbon and copper electrodes?

• Temperature change of the solution

• Formation of a new compound

• Thickness change of the electrode

• Color change of the solution

Why is the brown solid more visible on carbon electrodes?

• Carbon is white, highlighting the brown

• Carbon is transparent

• Carbon is black, contrasting with brown

• Carbon absorbs the brown color

What happens to the copper ions at the cathode in both types of electrodes?

• They form copper metal

• They release oxygen gas

• They dissolve into the solution

• They form copper oxide

What is the color of the copper metal formed during electrolysis?

• Green

• Brown

• White

• Black

What is the role of the electrode in the electrolysis process?

• To participate in the chemical reaction

• To change the color of the solution

• To act as a catalyst for the reaction

• To provide a surface for gas formation