Introduction to electrolysis

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 free to move when it is melted
• There are no ions in solid lead(II) bromide

The electrode connected to the positive terminal of a battery is __________.

• cathode
• anode

The negatively charged ions migrate toward the ________.

• anode
• cathode

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is electrolysis?

• breaking down of a compound using a current
• making a compound using a current

Tags

NGSS.HS-PS3-5

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.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is the name given to the solution that is being electrolysed?

• Salt solution
• Electric solution
• Mineral solution
• Electrolyte

Tags

NGSS.HS-PS1-5

Explain why the electrolyte has to be a liquid.

• So the ions can move
• So the electrons can move
• So that it doesn't get too hot
• So the fish are ok

What happens at the positive electrode?

• Positive non-metal ions are attracted
• Positive metal ions are attracted
• Negative non-metal ions are attracted
• Negative metal ions are attracted

Tags

NGSS.HS-PS2-5

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

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

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What does the Cathode (-) do to ions?

• Give electrons to the Positive ions to turn them back into atoms
• Take electrons from the positive ions?
• Turn ions back into atoms by removing electrons
• Turn atoms into ions by adding electrons