AnswersTX-Chemistry BUnit Test

Unit Test — Cumulative exam Answers

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21
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Which force is most responsible for binding together an atom’s protons and neutrons?

A
electrostatic
B
gravitational
C
nuclear
D
magnetic
22
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What change of energy occurs between the steam generator and the turbine?

A
Chemical energy is converted into nuclear energy.
B
Nuclear energy is converted into thermal energy.
C
Thermal energy is converted into mechanical energy.
D
Mechanical energy is converted into electrical energy.
23

Which type of radiation is blocked by the skin but is the most dangerous once it is inside the body?

A
beta particles
B
radionuclides
C
alpha particles
D
gamma particles
24

Which household item uses radiation in a beneficial way?

A
conventional ovens
B
smoke detectors
C
electric air filters
D
computers and TV sets
25

Which best describes nuclear fission?

A
A nucleus spontaneously splits and absorbs energy.
B
Two nuclei spontaneously combine and absorb energy.
C
A nucleus collides with a neutron and splits, releasing energy.
D
Nuclei combine to form a heavier nucleus, releasing energy.
26

O-18, an isotope of oxygen, has a stable nucleus. O-19, another isotope of oxygen, does not have a stable nucleus. Based on this information, which statement is correct?

A
O-19 is radioactive; O-18 is not radioactive.
B
O-19 has a mass defect; O-18 does not have a mass defect.
C
O-19 has a nuclear binding energy; O-18 does not have a nuclear binding energy.
D
O-19 has more neutrons than protons; O-18 has equal numbers of neutrons and protons.
27

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
28

The atomic symbol represents lead-206 (Pb-206), an isotope that has 82 protons and 124 neutrons. Which atomic symbol could represent an isotope that undergoes radioactive decay to produce Pb-206?

Question illustration
A
Superscript 238 subscript 92 upper U.
Option A
B
Superscript 222 Subscript 87 upper P b
Option B
C
Superscript 178 subscript 72 upper H f.
Option C
D
Superscript 192 subscript 77 upper P b.
Option D
29

A radioactive nuclide that is used to label blood platelets has 49 protons and 62 neutrons. Which is the symbol of this nuclide?

A
Superscript 49 subscript 62 upper I n.
Option A
B
Superscript 62 subscript 49 upper I n.
Option B
C
Superscript 49 subscript 111 upper I n.
Option C
D
Superscript 111 subscript 49 upper I n.
Option D
30

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.

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