Ontario Grade 9 Science Class Practice Exam

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What is nuclear fusion?

  1. The splitting of a heavy nucleus into two lighter nuclei

  2. The combining of light nuclei to form a heavier nucleus

  3. The process of changing a solid directly into gas

  4. A reaction that does not change the nucleus of an atom

The correct answer is: The combining of light nuclei to form a heavier nucleus

Nuclear fusion is the process in which two or more atomic nuclei combine to form a heavier nucleus, releasing large amounts of energy in the process. This process is the opposite of nuclear fission, which is the splitting of a heavy nucleus into two lighter nuclei. Option C is incorrect because it describes sublimation, not nuclear fusion. Option D is incorrect because nuclear fusion involves the changing of the nucleus of an atom.

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