Unit 4

Question 1

What is electrolysis?

Answer 1

The decomposition of an ionic compound, when molten or in aqueous solution (electrolyte), by the passage of an electric current

Question 2

What is the positive electrode?

Answer 2

Anode

Question 3

What is the negative electrode?

Answer 3

Cathode

Question 4

What are electrodes usually made of?

Answer 4

Platinum or graphite

Question 5

Why are metal objects electroplated?

Answer 5

1. Improve appearance
2. More resistance to corrosion

Question 6

How does a hydrogen-oxygen fuel cell produce electricity?

Answer 6

Uses hydrogen and oxygen to produce electricity with water as the only chemical product.

Question 7

Advantages of Hydrogen-Oxygen Fuel Cells

Answer 7

• Less pollution
• High energy efficiency
• Less noise pollution

Question 8

Disadvantages of Hydrogen-Fuel cells

Answer 8

• Challenges in storage (due to gaseous state)
• Expensive
• Limited filling infrastructure
• Pollution from manufacture