Alternative fuels

Question 1

Ethanol (4)

Answer 1

• Biofuel
• Produced from plant material
• Made from the fermentation of plants
• Often mixed with petrol

Question 2

Pros and cons of ethanol

Answer 2

-Carbon neutral (co2 taken in by plants)

• Engines need to be converted
• Not widely available
• As demand increases, so will food prices

Question 3

Biodiesel (3)

Answer 3

• Biofuel
• Produced from vegetable oils
• Can be mixed with ordinary diesel fuel

Question 4

Pros/cons of biodiesel

Answer 4

• Carbon neutral
• Engines do not need to be converted
• Produces less sulfur dioxide/particulates than ordinary diesel fuel
• Can’t make enough to completely replace diesel
• Expensive to make

Question 5

Hydrogen gas(3)

Answer 5

• Can be used to power vehicles
• Get the hydrogen from the electrolysis of water
• This takes electrical energy which comes from a renewable source to split it up

Question 6

Pros/cons of hydrogen gas

Answer 6

-Clean: combines with oxygen in the air to produce just water.

• Need a special/expensive engine
• Hydrogen isn’t widely available
• Hard to store(it is explosive)