Study Guide for Unit 3

Study Guide for Unit 3 - Study Guide for Unit#3 Possible...

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Study Guide for Unit #3 Possible short answer and essay questions: 1. What is carbon sequestration? List 3 ways to sequester carbon. Carbon Sequestration = capture carbon dioxide and remove it from the atmosphere Methods of Carbon Sequestration: Terrestrial sequestration via photosynthesis by plants and microorganisms Injection into geological strata. Launch into space or to the sun. 2. What is a radioactive isotope? Give several examples of radioactive particles/waves. Atoms with more than 83 protons are radioactive. Atoms with an imbalance between neutron and proton numbers will be radioactive. Alpha particles(α) –heavy elements will throw off mass in the form of a helium nucleus example: 92U238→ 90Th234+ 2He4 Beta particles(β-) –when there are too many neutrons, a neutron will be converted into a proton plus an ejected electron example: 38Sr90→ 39Y90+ e- X -rays–high energy electrons hitting metal causes energy to be given off as X-rays Gamma rays(γ) –higher energy than X-rays; a way for unstable atoms to throw off excess energy (example = chemotherapy) 3. What is the difference between nuclear fission and nuclear fusion? Which ( fission or fusion) is currently used in the nuclear facilities in the United States? Two different nuclear reactions release energy: fission and fusion. In nuclear fusion two lighter nuclides join together to form a heavier nuclide. In nuclear fission one heavy nuclide splits into two smaller ones. These two are not necessarily identical. U.S. is currently used fission nuclear. 4. Select three renewable energy sources. Discuss the pros and cons of each. Wind: Advantages: Wind energy is friendly to the surrounding environment, as no fossil fuels are burnt to generate electricity from wind energy. Newer technologies are making the extraction of wind energy much more efficient. The wind is free, and we are able to cash in on this free source of energy. Wind turbines are a great resource to generate energy in remote locations, such as mountain communities and remote countryside. When combined with solar electricity, this energy source is great for developed and developing countries to provide a steady, reliable supply of electricity. Disadvantages: In many areas, the winds strength is too low to support a wind turbine or wind farm, and this is where the use of solar power or geothermal power could be great alternatives. Wind turbine construction can be very expensive and costly to surrounding wildlife during the build process.
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The noise pollution from commercial wind turbines is sometimes similar to a small jet engine. This is fine if you live miles away, where you will hardly notice the noise, but what if you live within a few hundred meters of a turbine? This is a major disadvantage. Protests and/or petitions usually confront any proposed wind farm development. People feel the
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Study Guide for Unit 3 - Study Guide for Unit#3 Possible...

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