Hydrogen

Question 1

How is hydrogen made?

Answer 1

Electrolysis of water

Question 2

Advantages?

Answer 2

• No carbon or sulfur dioxide emissions

- Releases 3X as much energy as petrol per kg

Question 3

Disadvantages?

Answer 3

• Has to be stored as a compressed gas

- Needs a larger fuel tank

Question 4

When does using hydrogen become more efficient?

Answer 4

Used in a fuel cell to make electricity to power electric cars

Question 5

How does a fuel cell work?

Answer 5

Oxygen is fed to a cathode and hydrogen to an anode. A platinum catalyst removes electrons from hydrogen atoms and sends them to the cathode to meet the hydrogen ions which react with oxygen at the cathode to form water