Here are the correct answers for the questions provided:
12. Which of the following BEST describes what occurs in a fusion reaction?
C) Two low mass nuclei are joined to form one nucleus and gives off energy.
13. Compared to an ordinary chemical reaction, a fission reaction will:
c) release a larger amount of energy.
14. How many half-lives does it take a radioactive substance to decay until only one-eighth of the original substance remains?
b) three
(One half-life reduces the substance to half, so after three half-lives: 1/2 → 1/4 → 1/8)
15. Nuclear reactions always involve lots of energy.
True
16. Which factor explains why a cube of sugar placed in water will dissolve at a slower rate than granular sugar over time?
c) The cube has a smaller surface area.
17. Which process occurs when one nucleus splits to form two smaller nuclei?
b) fission