Electrolysis and Ionic Conductivity

The video explains electrolysis, where electrical current flows through a liquid causing chemical changes. It covers the conditions needed for electrolysis, such as the presence of a molten ionic compound or an aqueous solution. Using sodium chloride as an example, the video describes how ions move towards electrodes, leading to chemical reactions. It also explains the role of electrodes, the movement of electrons in metals, and the terminology used in electrolysis, such as anode, cathode, and electrolyte.

What is electrolysis?

• The flow of electrical current through a solid.

• The flow of electrical current through a liquid causing chemical changes.

• The flow of electrical current through a gas.

• The flow of electrical current through a vacuum.

What must a liquid contain to conduct electricity?

• Free-moving electrons

• Free-moving ions

• Free-moving protons

• Free-moving neutrons

What are the positive ions in molten sodium chloride called?

• Neutrons

• Protons

• Anions

• Cations

What happens when two copper electrodes are connected to an electrical cell in molten sodium chloride?

• The ions start to move towards the electrodes

• The liquid solidifies

• The liquid evaporates

• Nothing happens

What is the role of electrons in a metal when a potential difference is applied?

• They move towards the negative terminal

• They move towards the positive terminal

• They remain stationary

• They move randomly

What is the positive electrode called in electrolysis?

• Anode

• Cathode

• Conductor

• Electrolyte

What happens when ions meet the electrodes in electrolysis?

• They evaporate

• They become neutral

• They exchange electrons and trigger a chemical reaction

• They solidify

What is an electrolyte?

• A solid that conducts electricity

• A liquid with free-moving ions that conducts electricity

• A vacuum that conducts electricity

• A gas that conducts electricity

How can the ion flow rate in an electrolyte be increased?

• By decreasing the concentration of the solution

• By increasing the potential difference

• By decreasing the potential difference

• By increasing the temperature

What carries the electrical charge in the electrodes and wires during electrolysis?

• Ions

• Electrons

• Protons

• Neutrons