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Chapter 24: BIOFUELS
Answers to Review Questions
TRUE/FALSE
1. Most of the energy we use is from nonrenewable sources.
2. Fossil fuel is a renewable resource.
3. The total petroleum need for the United States is about 5,000 barrels a day.
4. Much of the petroleum we use comes from the Middle East.
5. Ethanol is a fuel made from corn.
6. By-products from making ethanol are discarded.
7. Biodiesel is a fuel composed of vegetable or animal oil combined with gasoline.
8. Diesel engines will run on pure vegetable oil.
9. Manure can be used as a source of fuel.
10. Biomass is another term for grain used in making fuel.
MULTIPLE CHOICE
1. Energy may come in the form of
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2. Coal and petroleum are examples of
3. We import petroleum from
4. Ethanol is a form of
5. A country that has made good use of ethanol as a fuel is
6. Diesel engines were originally designed to run on
7. The burning of fossil fuels gives off
8. Wood is a form of
9. Manure can be used to make
10. A lagoon is used to store
DISCUSSION
1. What is the difference between a renewable and a nonrenewable energy source?
2. Briefly explain why we need to develop biofuels.
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3. Name the most common forms of biofuel.
4. Name two methods used to produce ethanol from corn.
5. What is meant by fermentation?
6. Why has biodiesel become popular?
7. List some of the common sources of biomass.
8. Explain how manure can be used as a fuel.
9. What is the source of natural gas?
10. Explain two concerns about the use of biofuels.