Electrolysis of Molten Compounds Quiz

What is electrolysis?

• The process of heating a substance to its melting point using electricity

• The chemical decomposition of a compound by passing an electric current through it

• The process of reacting two elements together by passing an electric current through them

• The physical separation of a mixture into its elements

What happens to the ions in a molten compound during electrolysis?

• They form a solid precipitate

• They move towards the electrodes

• They evaporate as gas

• They remain stationary

What is always true about non-metal ions?

• They form a solid precipitate

• They move towards the positive electrode

• They are positively charged

• They won't react in electrolysis

Which of the following would not make a suitable electrolyte for electrolysis?

• Sodium chloride (aq)

• Copper sulphate (aq)

• sodium bromide (l)

• copper chloride (s)

What is the charge on the ions that move towards the positive electrode during electrolysis?

• Positive

• Negative

• Neutral

• Variable

In the electrolysis of molten sodium chloride, what is produced at the positive electrode (anode)?

• Chlorine gas

• Sodium metal

In the electrolysis of molten sodium chloride, what is produced at the negative electrode (cathode)?

• Chlorine gas

• Sodium metal

What is the role of the positive electrode in electrolysis?

• To supply electrons to the electrolyte

• To collect electrons from the electrolyte

• To act as a catalyst

• To increase the temperature of the electrolyte

During the electrolysis of molten lead(II) bromide, what is formed at the positive electrode (anode)?

• Lead metal

• Bromine gas

• Oxygen gas

• Hydrogen gas

Which of the following is correct for the negative electrode (cathode)?

• The electrode where oxidation occurs (a substance losing electrons)

• The electrode where reduction occurs (a substance gaining electrons)