Electrolysis of aqueous solutions L2 plenary

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.MS-PS2-5

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

• Salt solution
• Electric solution
• Mineral solution
• Electrolyte

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

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

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

What is the equation to show what happens to Cl ions at the anode.

• Cl^- --> Cl + e-   
• 2Cl^- --> Cl₂ + 2e-   
• Cl₂ + 2e-   2Cl^- 
• Cl₂ + 2e-  _-->  2Cl^- 

Why is electrolysis of aqueous (dissolved) solutions more complicated than molten?

• Water is messy

• Water contributes hydrogen and hydroxide ions to the electrolyte

• It is easier to dissolve some substances in water than to melt them

In an aqueous solution of copper chloride, which substance is produced at the positive electrode

• copper
• chlorine
• oxygen
• ^chloride