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Flashcards in Biofuels Deck (10):
0

What is fermentation?

When bacteria or yeast break down sugars by anaerobic respiration

1

Why are biofuels better than fossil fuels?

They are carbon neutral and are made by using natural products with useful waste products

2

How is ethanol made?

Yeast breaks down glucose by anaerobic respiration

3

What is the equation for the break down of glucose?

Glucose > ethanol + carbon dioxide + energy

4

Where do you get the glucose from?

Sugar cane or maize starch

5

What is biogas?

It's made by anaerobic fermentation of waste material and is 70% methane and 30% carbon dioxide

6

What needs to be kept constant in a fermenter for biogas to be made?

The temperature

7

What is a disadvantage of biogas?

It has to be used straightaway because it can't be stored as a liquid

8

What are the waste products of biogas production used for?

Fertiliser for crops

9

What are the 4 factors to consider when designing a generator?

Cost, convenience, efficiency and position