Electrolysis Assessment

What is the primary purpose of electrolysis?

• To combine ionic compounds

• To break down ionic compounds using electricity

• To create new elements

• To remove electrons from atoms naturally

At which electrode does oxidation occur?

• Neither electrode

• Both electrodes simultaneously

• Anode (positive electrode)

• Cathode (negative electrode)

During the electrolysis of molten lead(II) bromide, what forms at the cathode?

• Bromine gas

• Oxygen gas

• Hydrogen gas

• Liquid lead

Which color gas is produced at the anode during the electrolysis of concentrated aqueous sodium chloride?

• Colorless

• Reddish-brown

• Blue

• Pale green

What happens at the cathode during electroplating?

• The metal dissolves

• Oxidation occurs

• Gas evolution occurs

• Metal ions deposit

In the electrolysis of copper(II) sulfate with inert electrodes, what forms at the anode?

• Copper metal

• Oxygen gas

• Hydrogen gas

• Sulfate ions

Which factor does NOT affect electrolysis?

• Atmospheric pressure

• Temperature

• Voltage applied

• Concentration of electrolyte

During electrolysis, electrons flow through the external circuit from:

• Cathode to anode

• Electrolyte to cathode

• Anode to cathode

• Randomly in both directions

In electroplating, what serves as the cathode?

• The object being plated

• The pure metal source

• The electrolyte solution

• The power supply

What occurs at the cathode during electrolysis?

• Oxidation

• Loss of electrons

• Gas evolution only

• Reduction