Required Practical: Electrolysis of Aqueous Solutions (AQA GCSE Chemistry Combined Science): Quizzes

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Required Practical: Electrolysis of Aqueous Solutions
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Why is electrolysis of aqueous solutions more complex than molten ionic compounds?

Water produces H+H^+ and OH−OH^- ions

What ions does water produce when it dissociates during electrolysis?

H+H^+ and OH−OH^- ions

At the cathode, which ion is reduced during electrolysis of aqueous solutions?

The less reactive ion

At the anode, which ion is oxidised during electrolysis of aqueous solutions?

The ion that oxidises more easily

What is produced at the cathode during electrolysis of copper(II) sulfate solution?

Solid copper

Why are Cu2+Cu^{2+} ions reduced instead of H+H^+ ions in copper sulfate solution?

Copper is less reactive than hydrogen

What is produced at the anode during electrolysis of copper(II) sulfate solution?

Oxygen gas

Why are OH−OH^- ions oxidised at the anode in copper sulfate solution?

There are no halide ions present

What is produced at the cathode during electrolysis of sodium chloride solution?

Hydrogen gas

Why are H+H^+ ions reduced instead of Na+Na^+ ions in sodium chloride solution?

Sodium is more reactive than hydrogen

What is produced at the anode during electrolysis of sodium chloride solution?

Chlorine gas

When is oxygen gas produced at the anode during electrolysis of aqueous solutions?

When no halide ions are present

Explore AQA GCSE Chemistry Combined Science Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

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Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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