Future Energy Demands Quiz
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Questions and Answers

What is the goal set by the U.S. Department of Energy for substituting gasoline with biofuels by 2030?

  • 40%
  • 30% (correct)
  • 10%
  • 20%

    • Why must ethanol be distilled 2× before use?

  • To improve its shelf life
  • To increase its energy content
  • To remove water (correct)
  • To remove impurities

    • How is ethanol primarily produced for use as a biofuel?

  • By using crop residues to ferment cellulose
  • By microbial fermentation of plant starches in corn (correct)
  • By mixing with existing petroleum-based fuels
  • By distillation of crude oil

    • What is one disadvantage of using crop residues (waste material) to ferment cellulose for biofuel production?

    <p>Increased pesticide and fertilizer use</p> Signup and view all the answers

    Why is ethanol considered to have drawbacks as a biofuel?

    <p>It absorbs water and can’t be shipped through existing pipelines</p> Signup and view all the answers

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