C6 Electrolysis

Question 1

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

Answer 1

1. Positive

Question 2

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

Answer 2

2. Cathode and anode

Question 3

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

Answer 3

3. Lead

Question 4

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

Answer 4

4. Needs a lot of energy so expensive

Question 5

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

Answer 5

5. Reacts with oxygen to make carbon dioxide

Question 6

6. What ions does water split into?

Answer 6

6. H+ and OH-

Question 7

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

Answer 7

7. The least reactive will be given off

Question 8

8. Which is more likely to be given off, oxygen or a halogen (Group 7)?

Answer 8

8. A halogen. Only if there isn’t one will oxygen be given off.