AnswersCR03101 ChemistryUnit Test

Unit Test — Unit test Answers

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An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have?

A
some shielding required
B
positive or negative charge
C
low penetrating power
D
no charge
2
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A target is shielded from a radioactive sample by a sheet of metal. What kind of radiation can pass through the sheet of metal and hit the target?

A
gamma rays only
B
gamma rays and beta particles
C
beta particles only
D
beta particles and alpha particles
3

Consider the incomplete equation below If this equation was completed, which statement would it best support?

Question illustration
A
Nuclear fusion produces elements that are heavier than helium.
B
Nuclear fusion produces elements that are lighter than helium.
C
Nuclear fission produces elements that are heavier than helium.
D
Nuclear fission produces elements that are lighter than helium.
4

Which best describes a chain reaction associated with a nuclear reaction?

A
Neutrons released during a fusion reaction cause other nuclei to fuse.
B
Neutrons released during a fission reaction cause other nuclei to split.
C
Helium nuclei released during a fission reaction cause other nuclei to split.
D
Helium nuclei released during a fusion reaction cause other nuclei to fuse.
5

The symbol for a radioactive nuclide is . Which statement is correct?

Question illustration
A
The atomic number of the radioactive nuclide is 210.
B
The mass number of the radioactive nuclide is 294.
C
The number of neutrons present in the nucleus of each atom is 126.
D
The number of protons present in the nucleus of each atom is 210.
6

A mining company wants to build a modern processing plant that is safe for workers. The location of the plant is close to the mining operation, which has inadvertently exposed some sources of radionuclides. Which is the best reason for consulting with a nuclear chemist before building the processing plant?

A
to determine the level of radionuclides present
B
to explain the health concerns that are related to radiation
C
to destroy all the radionuclides in the area immediately
D
to conduct tests to see if workers are affected by radiation
7

Which statement is true about the use of radiation to treat cancer?

A
Only weak X-rays can be used.
B
Only powerful X-rays can be used.
C
Only beta particles can be used.
D
Only alpha particles can be used.
8

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?

A
Superscript 53 subscript 78 upper I.
Option A
B
Superscript 78 subscript 53 upper P t.
Option B
C
Superscript 131 subscript 78 upper P t.
Option C
D
Superscript 131 subscript 53 upper I.
Option D
9

Which type of reaction does this diagram represent?

Question illustration
A
nuclear fission because an atom is splitting into two fragments
B
nuclear fusion because the products that are produced are radioactive
C
nuclear fission because a large amount of energy is being released
D
nuclear fusion because atomic nuclei combine to form a heavier nucleus
10

Consider the nuclear equation below.What is X?

Question illustration
A
Superscript 235 subscript 96 upper C m.
Option A
B
Superscript 243 subscript 92 upper U.
Option B
C
Superscript 235 subscript 92 upper U.
Option C
D
Superscript 243 subscript 96 upper C m.
Option D
11

Which represents a balanced nuclear equation?

A
Superscript 23 subscript 11 upper N a right arrow superscript 24 subscript 12 upper M g plus superscript 1 subscript 1 upper H.
Option A
B
Superscript 24 subscript 11 upper N a right arrow superscript 24 subscript 12 upper M g plus superscript 0 subscript negative1 e.
Option B
C
Superscript 24 subscript 11 upper A l right arrow superscript 24 subscript 12 upper M g plus superscript 0 subscript negative 1 e.
Option C
D
Superscript 23 subscript 12 upper M g right arrow superscript 24 subscript 12 upper M g plus superscript 1 subscript 0 e.
Option D
12

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is

A
lighter than helium.
B
heavier than helium.
C
used for energy on Earth.
D
radioactive.
13

Which profession is likely to use a radiation shield?

A
dentist
B
astronomer
C
mathematician
D
geologist
14

Which type of radiation is the main hazard during radiological procedures?

A
alpha
B
beta
C
gamma
D
positron
15

Examine the nuclear reaction: . Why is this classified as a nuclear reaction rather than a chemical reaction?

Question illustration
A
It is not balanced.
B
A new compound is formed.
C
A change has occurred in a nucleus.
D
A new element has been formed.
16

What part of an atom is involved in a chemical reaction?

A
proton
B
neutron
C
nucleus
D
electron
17

The table lists the number of protons, electrons, and neutrons in a certain radioactive nuclide.ElectronsProtonsNeutrons111113Which is the symbol of this radioactive nuclide?

A
Superscript 24 subscript 11 upper N a.
Option A
B
Superscript 22 subscript 11 upper N a.
Option B
C
Superscript 13 subscript 11 upper Al.
Option C
D
Superscript 24 subscript 13 upper A l.
Option D
18

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.
19

Which is a characteristic of nuclear fusion?

A
produces radioactive waste
B
involves the collision of two nuclei
C
commonly used by humans as an energy source
D
requires very little activation energy
20

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

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