Electrolysis

Question 1

What is electrolysis?

Answer 1

Using electricity to split up ionic compounds into the ions

Question 2

1. What is the charge on the ions that move to the negative electrode?

Answer 2

1. Positive

Question 3

2. What are the names for the negative and positive electrodes?

Answer 3

2. Negative electrode = cathode Positive electrode = anode

Question 4

3. In the electrolysis of lead bromide, what will go to the negative electrode?

Answer 4

3. Lead

Question 5

4. What is one disadvantage of using electrolysis to extract metals?

Answer 5

4. Needs a lot of energy so expensive

Question 6

5. Why does the carbon anode need replacing all the time when you extract aluminium by electrolysis?

Answer 6

5. The carbon electrode reacts with the oxygen produced at the electrode to make carbon dioxide

Question 7

6. What ions does water split into?

Answer 7

6. H+ and OH-

Question 8

7. How do we know which positive ions will be produced in electrolysis of a solution?

Answer 8

7. The least reactive will be produced

Question 9

8. What is the rule for what is produced at the positive electrode in electrolysis of a solution?

Answer 9

8. If there is a halogen (Group 7) it will be produced. If there isn’t one - oxygen be produced.