Electrolysis of Ionic Compounds: Molten and Aqueous Solutions

The video tutorial explains the concept of electrolytes and the process of electrolysis. It begins with the electrolysis of molten lead bromide, detailing how ions move towards electrodes to form bromine gas and solid lead. The tutorial then covers the electrolysis of aluminium oxide dissolved in cryolite, highlighting the role of graphite electrodes and the formation of oxygen gas and liquid aluminium. Finally, it discusses electrolysis in aqueous solutions, using copper sulfate as an example, and explains how the presence of different ions affects the products formed at the anode and cathode.

What happens to bromide ions during the electrolysis of molten lead bromide?

• They form solid bromine.

• They remain in the solution.

• They move to the anode and form bromine gas.

• They move to the cathode and form bromine gas.

Why is cryolite used in the extraction of aluminum from aluminum oxide?

• To provide additional aluminum ions.

• To increase the melting point of aluminum oxide.

• To act as a catalyst.

• To decrease the melting point of aluminum oxide.

What is produced at the anode during the electrolysis of aluminum oxide?

• Aluminum metal

• Oxygen gas

• Hydrogen gas

• Carbon dioxide

In an aqueous solution, what is produced at the anode if halide ions are absent?

• Metal ions

• Hydrogen gas

• Oxygen gas

• Chlorine gas

What determines whether hydrogen or a metal is produced at the cathode in an aqueous solution?

• The presence of halide ions

• The concentration of the solution

• The reactivity of the metal compared to hydrogen

• The temperature of the solution

During the electrolysis of copper sulfate, what is expected to be collected at the anode?

• Hydrogen gas

• Chlorine gas

• Oxygen gas

• Copper metal

Why is copper deposited at the cathode during the electrolysis of copper sulfate?

• Copper ions are attracted to the anode.

• Copper ions are repelled by the cathode.

• Copper is less reactive than hydrogen.

• Copper is more reactive than hydrogen.