REACTION KINETICS - CHEMICAL EQUILIBRIUM - ELECTROCHEMISTRY

Which statement correctly describes the 2 electrodes?

• The anode is negative and the cathode is positive
• The anode and cathode are both positive
• The anode is positive and the cathode is negative
• The anode and cathode are both negative.

It is essetial that the electrolyte is a liquid so that...

• Charged ions can migrate towards the electrodes. 
• Charged ions can migrate towards the electrodes.
• The solution can move around.
• The current can flow through it.

Positive ions (cations) will move towards the cathode (-) where they will discharge by....

• Breaking apart
• Losing electrons
• Clumping together.
• Gaining electrons

When NaCl solution is electrolysed what has forms at the anode?

• Hydrogen
• Oxygen
• Chlorine
• Sodium

The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?

• Bromine atoms in lead(II) bromide are converted to ions when it is melted

• Electrons flow through the lead(II) bromide when it is melted

• The ions in lead(II) bromide are mobile charge carriers in the molten state.

• There are no ions in solid lead(II) bromide

What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?

• copper
• chlorine
• hydrogen
• oxygen

What is the half-equation for the discharge of hydroxide ions?

• 2O^2- --> O₂ + 4e^-

• OH^- --> OH + e

• 4OH^- --> 2H₂O + O₂ + 4e^-

• 2H₂O + O₂ + 4e^- --> 4OH^-

The picture shows electrolysis of copper(II) sulphate solution using graphite electrodes. Besides formation of brown solid on the cathode, what other observations can be made?

• The mass of graphite anode decreases.

• The blue colour solution becomes paler.

• Bubbles of gas form at the anode.

• The blue colour solution becomes darker.

What is the product formed at the cathode during the electrolysis of molten magnesium fluoride?

• magnesium
• hydrogen
• fluorine
• oxygen

What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?

• A

• B

• C

• D