12. Which of the following BEST describes what occurs in a fusion reaction?

Question

A) A chemical reaction occurs between the nuclei.
B) Electrons are shared between the nuclei.
C) Two low mass nuclei are joined to form one nucleus and gives off energy.
D) A single nucleus divides into two or more nuclei and gives off energy.
13. Compared to an ordinary chemical reaction, a fission reaction will:

a
absorb a smaller amount of energy.
b
release a smaller amount of energy.
c
release a larger amount of energy.
d
absorb 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?
a
six
b
three
c
two
d
eight
15. Nuclear reactions always involve lots of energy.
True
False
16. Which factor explains why a cube of sugar placed in water will dissolve at a slower rate than granular sugar over time?
a
The temperature of the cube decreases.
b
The particles in the cube have more movement.
c
The cube has a smaller surface area.
d
The mass of the cube decreases.
17. Which process occurs when one nucleus splits to form two smaller nuclei?

a
fusion
b
fission
c
both
d
neither

Answer 1

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