For each of the following statements, determine if it describes nuclear fission, nuclear fusion, or both.
A. Fission B. Fusion C. Both Fission & Fusion
30. takes place in stars
31. used for energy via nuclear power plants
32. unstable atomic nuclei become more stable via this reaction
30. Fusion
31. Fission
32. Both Fission & Fusion
Which of these statements best explains concern over greenhouse gases?
A. Greenhouse gases are bad, and need to be eliminated.
B. Some greenhouse gases are good, but the increase over the last 150 years means the planet is getting too warm.
C. Some greenhouse gases are good, but the decrease over the last 150 years means the planet is cooling off too quickly.
D. We need additional greenhouse gases in order to keep our planet warm.
B. Some greenhouse gases are good, but the increase over the last 150 years means the planet is getting too warm.
Why are there concerns with the eutrophication of a waterway?
A. an overabundance of nutrients cause an algal bloom
B. blue-green algae can make people and animals sick
C. lack of oxygen in the water can lead to dead zones
D. all of the above
D. all of the above.
How would each of these factors influence the rate of a reaction?
A. speed it up B. slow it down C. would have no effect
35. reduce temperature
36. increase the concentration of reactant
37. crush reactant into smaller pieces
35. Slow it down
36. Speed it up
37. Speed it up
Which of the following is true of nuclear reactions, but not chemical reactions?
A. involves chemical bonds breaking and forming of new bonds
B. involves extremely large energy changes
C. involves changes to the electrons of atoms involved
D. can be represented by a balanced equation
B. involves extremely large energy changes.
To determine if each statement describes nuclear fission, nuclear fusion, or both, we can consider the characteristics of each process. Here are the explanations:
30. "Takes place in stars": This statement describes nuclear fusion. Fusion is the process of combining two light atomic nuclei to form a heavier nucleus, which is the main source of energy in stars.
31. "Used for energy via nuclear power plants": This statement describes both nuclear fission and fusion. Nuclear fission, the splitting of a heavy atomic nucleus into two lighter nuclei, is the process used in nuclear power plants. However, in the context of nuclear power plants, the statement specifically refers to fission reactions.
32. "Unstable atomic nuclei become more stable via this reaction": This statement describes both nuclear fission and fusion. Both processes, fission and fusion, involve unstable atomic nuclei transforming into more stable configurations. In fission, a heavy nucleus splits into lighter nuclei, and in fusion, lighter nuclei combine to form a heavier nucleus.
To summarize:
30. Fusion
31. Both Fission & Fusion (emphasis on nuclear power plants)
32. Both Fission & Fusion