Name: Date: Science 10: 7.3 Nuclear Reactions Text: Chapter 7, pages 312-325 Part A: Nuclear Reactions Overview -What is the difference between nuclear fission and nuclear fusion? _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ ______________________________________________________________________ _______________ ______________________________________________________________________ _______________ Part B: Nuclear Fission -Why do you think large, heavy nuclei might split apart? Science 10: 7.3 Nuclear ReactionsPage 1
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Name: Date:
Science 10: 7.3 Nuclear Reactions
Text: Chapter 7, pages 312-325
Part A: Nuclear Reactions Overview
-What is the difference between nuclear fission and nuclear fusion?
-Scientists can actually cause the radioactive decay of a nuclear by making it unstable. What is different about the reaction below from the natural radioactive decay we explored in 7.1?
-The induced nuclear reaction can be written in two ways:
-There are a couple of rules for writing nuclear equations:
1. The sum of the mass numbers on each side of the equation stays the same.
2. The sum of the charges on each side of the equation stays the same.
*Complete Reading Check on page 315.
Science 10: 7.3 Nuclear Reactions Page 3
Part D: Nuclear Fission of Uranium-235
-Examine the diagram below. Why do you think that it is easier for a neutron to be crashed into Uranium-235 than an alpha particle into Nitrogen-14 (as depicted on the previous page)?
Science 10: 7.3 Nuclear Reactions Page 4
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-Why does only the mass number of uranium change and not the atomic number?
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-Are both sides of the equation equal?
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-The nuclear fission of U-235 the reaction that occurs inside of nuclear power plants and nuclear weapons.
*Complete the Practice Problems on page 317.
Part E: Chain Reactions
-What do you think happens to the three neutrons produced by this decay of U-236?
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-Chain reactions can quickly get out of control, but this danger is managed in nuclear reactors by using materials that absorb neutrons.
-Canada’s CANDU reactors are amongst the safest in the world and produce energy by the nuclear fission of U-235.
Science 10: 7.3 Nuclear Reactions Page 5
-Used U-235 rods can be hazardous to get rid of as they continue to be radioactive for twenty half-lives (thousands of years). Some rods can be re-used, but others must be stored sealed inside concrete or metal containers underground.
Part F: Nuclear Fusion
-Examine the diagram right. What is nuclear fusion?
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-Nuclear fusion occurs in stars, like our Sun. Why do you think scientists have not been able to successfully re-create this reaction?
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*Complete Check Your Understanding 1-11 on page 325.