Electro Chem and redox review

Carbon electrodes conduct electricity. What is another property these electrodes have that make them useful?

• They are cheap

• They are inert

• They are highly reactive

• they are mildly reactive

2Fe + O₂  → Fe₂O₃

• The Iron is oxidized because it gains electrons. Oxygen is reduced because it loses electrons.

• The Iron is oxidized because it loses electrons, Oxygen is reduced because it gains electrons.

• The Oxygen is oxidized because it gains electrons. Iron is reduced because it loses electrons.

• The Oxygen is oxidized because it loses electrons, Iron is reduced because it gains electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

During electrolysis of aluminum oxide, what is formed at the Cathode?

(a)  

During electrolysis of aluminum oxide, what is formed at the anode?

(a)  

In What state does an ionic compound MUST be in for electrolysis to occur? Sleect all that apply

• liquid

• salt form

• molten

• aqueous

When dilute sulfuric acid is electrolyzed using inert electrodes, oxygen gas is produced at the positive electrode. What gas is produced at the negative electrode?

(a)  

How is aluminum extracted?

(a)  

During the process to extract aluminum, what can you do to make the process most efficient?

• Grind the aluminum oxide before melting to speed-up the rate of electrolysis.

• Break the bauxite down to form Aluminum Oxide and dissolve in acid.

• Melt the Aluminum Oxide to electrolyze, separating the aluminum and oxygen

• Dissolve Aluminum Oxide in Cryolite to electrolyze separating the aluminum and oxygen.

Why does the electrolyte need to be in a liquid state?

• less energy when an electric current in ran through the cell

• To allow ions to move

• It is more cost effective

• This is the way it has always been so we keep doing it

If you were conducting an electroplating experiment to copper a brass spoon in a electrolyte of Copper (II) Sulfate; what would the correct half equations for the cathode? Ensure you have the appropriate state symbols Use equal sign to represent an arrow

(a)