AnswersSS - TX - Chemistry BUnit Test

Unit Test — Unit test Answers

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1
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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
2
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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.
3

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
4

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
5

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.
6

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.
7

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.
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

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
11

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.
12

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

A
proton
B
neutron
C
nucleus
D
electron
13

Consider the nuclear equation below.What is the nuclide symbol of X?

Question illustration
A
Superscript 231 subscript 94 upper P u.
Option A
B
Superscript 235 subscript 90 upper T h.
Option B
C
Superscript 239 subscript 94 upper P u.
Option C
D
Superscript 231 subscript 90 upper T h.
Option D
14

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

Question illustration
A
The atomic number of the radioactive nuclide is 90.
B
The mass number of the radioactive nuclide is 144.
C
The number of neutrons that are present in the nucleus of each atom is 324.
D
The number of protons that are present in the nucleus of each atom is 234.
15

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
16

Both nuclear fusion and nuclear fission reactions

A
release radioactive waste.
B
involve the splitting of atoms.
C
are utilized in nuclear power plants.
D
release large amounts of energy.
17

Consider the nuclear equation below.Which correctly identifies the type of reaction?

Question illustration
A
alpha decay
B
beta plus decay
C
beta minus decay
D
gamma decay
18

What is the most penetrating kind of radiation product that can be shielded with aluminum foil?

A
alpha particles
B
beta particles
C
gamma rays
D
high-energy photons
19

What type of particle has no mass or charge?

A
Alpha
B
Beta
C
Gamma
D
Proton
20

Consider the nuclear equation below.What is the nuclide symbol of X?

Question illustration
A
Superscript 230 subscript 90 upper T h.
Option A
B
Superscript 229 subscript 89 upper A c.
Option B
C
Superscript 228 subscript 90 upper T h.
Option C
D
Superscript 238 subscript 88 upper R a.
Option D

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