Electrolysis and Ionic Reactions

This lesson explores the electrolysis of molten ionic compounds, focusing on sodium chloride and lead bromide. It explains how electrolysis decomposes these compounds into their elements, sodium and chlorine, or lead and bromine, respectively. The video also highlights the industrial applications of electrolysis, such as aluminium extraction.

What is the primary reason ionic solids cannot conduct electricity?

• They are too dense.

• Their ions are fixed in position.

• They have no free electrons.

• They are too cold.

In the electrolysis of molten sodium chloride, what happens at the cathode?

• Chlorine gas is produced.

• Chloride ions gain electrons.

• Sodium ions gain electrons.

• Sodium ions lose electrons.

What is the charge on sodium ions in molten sodium chloride?

• Negative

• Neutral

• Positive

• Variable

What type of reaction occurs at the anode during the electrolysis of sodium chloride?

• Precipitation

• Reduction

• Neutralization

• Oxidation

What is the role of inert materials like carbon or graphite in electrolysis?

• To conduct electricity.

• To react with the ions.

• To prevent electrode reactions.

• To increase the temperature.

During the electrolysis of lead bromide, what is observed at the anode?

• Bromide ions gain electrons.

• A brown gas is released.

• Silvery lead forms.

• Lead ions gain electrons.

What is the main product formed at the cathode during the electrolysis of lead bromide?

• Lead atoms

• Bromine gas

• Chlorine gas

• Sodium atoms

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

• They remain unchanged.

• They gain electrons.

• They form lead atoms.

• They lose electrons.

Which process is an example of industrial electrolysis?

• Extraction of sodium from sodium chloride

• Extraction of aluminum from aluminum oxide

• Extraction of lead from lead bromide

• Extraction of chlorine from water

Why is electrolysis considered useful in industrial processes?

• It is a fast process.

• It requires no energy.

• It decomposes compounds into elements.

• It is a natural process.