4.5 Alternative Fuels Flashcards

1
Q

What are biofuels?

A

Fuels made from plant or animal products that are renewable

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2
Q

How is biodiesel made?

A

From vegetable oils extracted from plants

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3
Q

What is an advantage of using biodiesel?

A

It makes very little contribution to carbon dioxide levels because the carbon dioxide given off when it burns replaces the carbon dioxide taken from the atmosphere by plants as they grew

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4
Q

What is a disadvantage of biodiesel?

A

Plants grown for biodiesel take up large areas of farmland

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5
Q

What is ethanol?

A

A biofuel made from sugar cane

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6
Q

What is good about ethanol?

A

It is a liquid so it can be stored and distributed like other liquid fuels. It can also be mixed with petrol

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7
Q

What is good about using hydrogen as a fuel?

A

It only produces water when it is burnt

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8
Q

What is bad about using hydrogen as a fuel?

A

It is a gas so it takes up a large volume so it is difficult to store

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9
Q

How can hydrogen be produced?

A

From water by electrolysis

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