AnswersTX-Chemistry BUnit Test

Unit Test — Cumulative exam Answers

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1
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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
2
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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.
3

Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?

A
distributing nuclear waste in small quantities in many locations
B
releasing nuclear waste into the atmosphere where living things are not affected
C
encasing nuclear waste in containers that are then taken to remote locations
D
pouring nuclear waste into oceans and larger lakes
4

What type of isotope undergoes radioactive decay?

A
one that has a nucleus with the same number of protons and neutrons
B
one that has an unstable nucleus
C
one that has the same number of protons and electrons
D
one that has a stable nucleus
5

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
6

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

A
alpha
B
beta
C
gamma
D
positron
7

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.
8

Which energy transformation occurs in the core of a nuclear reactor?

A
nuclear energy mechanical energy
Option A
B
nuclear energy thermal energy
Option B
C
thermal energy nuclear energy
Option C
D
mechanical energy nuclear energy
Option D
9

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.
10

Which quantity can be calculated using the equation E = mc2?

A
the energy needed to split an atom into separate protons, neutrons, and electrons
B
the energy needed to split the nucleus into separate protons and neutrons
C
the energy needed to remove an electron from an atom
D
the energy needed to add an electron to an atom
11

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.
12

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.
13

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
14

Which environmental hazard is directly related to nuclear power production?

A
land stripping
B
global warming
C
radiation leakage
D
soil erosion
15

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
16

Which profession is likely to use a radiation shield?

A
dentist
B
astronomer
C
mathematician
D
geologist
17

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
18

Which career is most concerned with the study of radioactive isotopes?

A
biochemist
B
nuclear chemist
C
organic chemist
D
nuclear engineer
19

What is the sequence of energy transformations that occur in a nuclear reactor?

A
nuclear energy mechanical energy thermal energy electrical energy
Option A
B
nuclear energy thermal energy mechanical energy electrical energy
Option B
C
thermal energy nuclear energy mechanical energy electrical energy
Option C
D
electrical energy thermal energy mechanical energy nuclear energy
Option D
20

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

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