Electrolysis

State why pure ethanol does not conduct electricity.

Which statement correctly explains why solid potassium bromide does not conduct electricity?

During electrolysis, anions migrate to the anode. What is the charge on an anion?

A student electrolysed molten lead(II) bromide using graphite electrodes. Which row correctly identifies the products at each electrode?

Which ionic half-equation correctly represents the reaction at the anode during the electrolysis of molten lead(II) bromide?

Explain why lead(II) bromide must be molten before electrolysis can occur. Which explanation is correct?

During the electrolysis of concentrated sodium chloride solution, hydrogen gas is produced at the cathode rather than sodium metal. Which explanation is correct?

A student electrolyses dilute sulfuric acid using graphite electrodes. Which products are formed?

Write the ionic half-equation for the reaction at the anode during the electrolysis of dilute sulfuric acid. Which equation is correct?

During the electrolysis of copper(II) sulfate solution using graphite electrodes, the blue colour of the solution gradually fades. Which explanation is correct?

An industrial chemist needs to extract a metal from its aqueous salt solution by electrolysis. The metal is deposited at the cathode. Which of the following metals could this be?

The reaction at the cathode during electrolysis is always classified as reduction. Which statement explains why?

A student claims: “During electrolysis of aqueous sodium chloride, sodium hydroxide is left in solution.” Is this claim correct, and why?

A researcher places a sample of solid glucose (C₆H₁₂O₆) between two electrodes connected to a d.c. power supply. The lamp in the circuit does not light. She then dissolves the glucose in water and retests. The lamp still does not light. Which explanation is correct?

During the electrolysis of copper(II) sulfate solution, a student observes a pink-brown solid forming on the cathode. Which half-equation represents this reaction?

In the electrolysis of aqueous potassium iodide (KI) solution using graphite electrodes, what are the products at each electrode?

A student performs the electrolysis of dilute sulfuric acid and collects the gases produced at each electrode in inverted test tubes. She notices that the volume of gas collected at the cathode is approximately double the volume collected at the anode. Which explanation is correct?

Explain why graphite is chosen as an electrode material for electrolysis experiments rather than iron. Which reason is correct?

A student tests a gas produced at the cathode during the electrolysis of dilute sulfuric acid. She holds a burning splint near the gas and hears a squeaky pop. Which gas has been confirmed?

A factory uses electrolysis to purify copper from copper(II) sulfate solution. After running the process for several hours, a technician notices the solution has become almost colourless and very little copper is being deposited. Which action would most effectively restore the rate of copper deposition?