AnswersMO-Chemistry B-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which best explains why water has a high specific heat?

A
Hydrogen bonds decrease the amount of energy that is required for the temperature to change.
B
Hydrogen bonds increase the amount of energy that is required for the temperature to change.
C
Ion-dipole interactions increase the amount of energy that is required for the temperature to change.
D
Ion-dipole interactions decrease the amount of energy that is required for the temperature to change.
22
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Which best explains why an iceberg floats?

A
Water expands and becomes denser when it freezes.
B
Water contracts and becomes denser when it freezes.
C
Water expands and becomes less dense when it freezes.
D
Water contracts and becomes less dense when it freezes.
23

Which word describes the water stored below Earth's surface?

A
floodplain
B
groundwater
C
kettle
D
sinkhole
24

What are one of the ways the atmosphere recycle gases through interactions with the biosphere ?

A
Through the usage of nitrogen and release oxygen into the atmosphere from plants.
B
Though the process photosynthesis
C
Through available sunlight and release oxygen into the atmosphere.
D
The mineral content in the ground that plants rely on and release carbon dioxide into the atmosphere.
25

What is the nuclear binding energy of an atom that has a mass defect of 5.0446 10–29 kg? Use E = mc2. (Remember: The speed of light is approximately 3.00 108 m/s.)

Question illustration
A
5.61 10–46 J
Option A
B
1.51 10–20 J
Option B
C
4.54 10–12 J
Option C
D
1.78 1045 J
Option D
26

What is the most effective approach the government can take to keep the air clean?

A
create and enforce regulations that limit fossil fuel burning by industries
B
use funds to understand why smoke and mold are causes of outdoor air pollutants
C
educate people about the threats to outdoor clean air from visible forms of air pollution
D
modify regulations under the Clean Air Act by including expensive options to reduce air pollution
27

Which represents the balanced equation for the beta minus emission of phosphorus-32?

A
Superscript 32 subscript 15 upper P right arrow superscript 28 subscript 13 upper A l plus superscript 4 subscript 2 upper H e.
Option A
B
Superscript 32 subscript 15 upper P right arrow superscript 32 subscript 14 upper S i plus superscript 0 subscript negative 1 e.
Option B
C
Superscript 32 subscript 15 upper P right arrow superscript 32 subscript 16 upper S plus superscript 0 subscript negative 1 e.
Option C
D
Superscript 32 subscript 15 upper P right arrow superscript 32 subscript 14 upper S i plus superscript 0 subscript plus 1 e.
Option D
28

Which of the following pollutants is most commonly associated with poor air quality?

A
Carbon monoxide
B
Oxygen
C
Nitrogen
D
Water Vapor
29

Consider the nuclear equation below.Which is the missing value that will balance the equation?

Question illustration
A
–1
B
0
C
+1
D
+2
30

Which answer choice best explains why atoms of carbon-14 (C-14) are unstable?

A
Atoms of C-14 have too many negatively charged electrons and too few positively charged protons.
B
Atoms of C-14 have too many positively charged protons and too few negatively charged electrons.
C
There are 2 more protons than neutrons in the nucleus.
D
There are 2 more neutrons than protons in the nucleus.
31

A nuclide of absorbs a positron. Which is the resulting atom?

Question illustration
A
Superscript 65 subscript 29 upper C u.
Option A
B
Superscript 63 subscript 29 upper C u.
Option B
C
Superscript 64 subscript 28 upper N i.
Option C
D
Superscript 64 subscript 30 upper Z n.
Option D
32

When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that

A
it is a reactant in one intermediate reaction and a catalyst in the other reaction.
B
it is a product in one intermediate reaction and a catalyst in the other reaction.
C
it is a reactant in one intermediate reaction and a product in the other reaction.
D
it is a reactant in both of the intermediate reactions.
33

Water molecules are polar because the

A
water molecule has a linear shape.
B
water molecule has a bent shape.
C
oxygen atom has fewer electrons around it.
D
hydrogen atom forms an ionic bond with oxygen.
34

What was the order of steps taken by the United States to clean the air?

A
enact the Clean Air Act, establish funding to study how to clean the air, create the EPA, and find cost-effective ways to keep the air clean
B
establish funding to study how to clean the air, enact the Clean Air Act, create the EPA, and find cost-effective ways to keep the air clean
C
find cost-effective ways to keep the air clean, establish funding to study how to clean the air, create the EPA, and enact the Clean Air Act
D
create the EPA, enact the Clean Air Act, find cost-effective ways to keep the air clean, and establish funding to study how to clean the air
35

How are energy and mass connected during the formation of an atom?

A
Energy is absorbed, so the mass is increased.
B
Energy is released, so the mass is increased.
C
Energy is absorbed, so the mass is reduced.
D
Energy is released, so the mass is reduced.
36

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

Question illustration
A
The atomic number of the radioactive nuclide is 75.
B
The mass number of the radioactive nuclide is 131.
C
The number of neutrons that are present in the nucleus of each atom is 56.
D
The number of protons that are present in the nucleus of each atom is 131.
37

Which feature may form as a result of erosion related to runoff?

A
deltas
B
gullies
C
flood plains
D
stalactites
38

Study the image of a plant.

Question illustration
A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
39

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.
40

Which statement illustrates the difference between a chemical reaction and a nuclear reaction?

A
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
B
A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
C
A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
D
A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.

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