AnswersSS - TX - Chemistry BUnit Test

Unit Test — Unit test Answers

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Which best describes what forms in nuclear fusion?

A
two smaller, more stable nuclei
B
two larger, less stable nuclei
C
one smaller, less stable nucleus
D
one larger, more stable nucleus
2
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How does critical mass play a role in nuclear reactions?

A
It is the minimum amount of material needed to start a fission reaction.
B
It is the minimum amount of material needed to start a fusion reaction.
C
It is the minimum amount of material needed to sustain a fission reaction.
D
It is the minimum amount of material needed to sustain a fusion reaction.
3

Which is most likely why many scientists reject the cold fusion theory?

A
There is too much waste involved in the process.
B
Cold fusion experiments have been conducted at room temperature only.
C
The process does not produce enough energy to meet the needs of modern humans.
D
The original results have not been replicated consistently and reliably.
4

Which equation represents a fission reaction?

A
mc009-1.jpg
Option A
B
mc009-2.jpg
Option B
C
mc009-3.jpg
Option C
D
mc009-4.jpg
Option D
5

Which is a characteristic of nuclear fusion but NOT nuclear fission?

A
releases large amounts of energy
B
is the energy source of stars
C
is used in electric power plants
D
requires little energy to occur
6

Research into nuclear fusion will likely require a large investment of time and money before it might be used as an energy source. Which statement best describes the benefits that would make the investment worthwhile?

A
Fusion requires a large amount of energy and occurs in stars.
B
Fusion produces large amounts of energy, and the fuel is found on Earth.
C
Fusion produces no radioactive waste, and the fuel is plentiful.
D
Fusion requires little energy to begin and would continue through a chain reaction.
7

Which element is nuclear fusion least likely to produce?

A
hydrogen, which has an approximate mass of 1
B
chlorine, which has an approximate mass of 35
C
argon, which has an approximate mass of 39
D
silicon, which has an approximate mass of 28
8

Why is it important for scientists to replicate each other’s experiments?

A
to determine if important scientific results are repeatable
B
to help the research of other scientists
C
to determine if slight alterations in the experiment can affect the result
D
to further their own research
9

Which statement is true about nuclear fusion?

A
It is caused by the same process that causes nuclear fission.
B
It does not occur naturally in the solar system.
C
It has very low activation energy.
D
It produces nearly all the elements that are heavier than helium.
10

Which type of reaction does this diagram represent?

Question illustration
A
nuclear fusion because nuclei combine to form a heavy nucleus
B
nuclear fission because an atom is splitting into two large fragments of comparable mass
C
nuclear fusion because a large amount of energy is being released
D
nuclear fission because the resulting products are not radioactive

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