AnswersMO-Chemistry B-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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What is the nuclear binding energy of an atom that has a mass defect of 1.643 10–28 kg? Use E = mc2. (Remember: The speed of light is approximately 3.00 108 m/s.)

Question illustration
A
1.83 10–46 J
Option A
B
4.93 10–20 J
Option B
C
1.48 10–11 J
Option C
D
5.48 1045 J
Option D
2
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Why does the presence of lone pair electrons contribute to the polarity of a water molecule?

A
They allow the bonds between oxygen and hydrogen to be single.
B
They increase the partial positive charge on the oxygen atom.
C
They prevent the atoms from forming a linear molecule.
D
They counter the uneven pull on electrons between the atoms.
3

Which process is a source of outdoor air pollution?

A
releasing mold particles from an air conditioning vent
B
emitting particles from a dump truck
C
releasing radon gas from a generator
D
emitting carbon monoxide from a heater
4

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of this nuclide?

A
Superscript 19 subscript 21 upper K.
Option A
B
Superscript 21 subscript 19 upper K.
Option B
C
Superscript 40 subscript 19 upper K.
Option C
D
Superscript 19 subscript 40 upper K.
Option D
5

What is a common use of bases?

A
as a component of vinegar
B
as a component of car batteries
C
to make foods tart
D
to reduce indigestion
6

Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?

A
The solution turns blue litmus to red.
B
The solution turns phenolphthalein pink.
C
The solution has more hydrogen ions.
D
The solution has fewer hydroxide ions.
7

Which answer choice represents a balanced alpha emission nuclear equation?

A
Superscript 52 subscript 26 upper F e right arrow superscript 52 subscript 25 upper M n plus superscript o subscript plus 1 e.
Option A
B
Superscript 235 subscript 92 upper U right arrow superscript 239 subscript 94 upper P u s plus superscript 4 subscript 2 upper H e.
Option B
C
Superscript 189 subscript 83 upper Bi right arrow superscript 185 subscript 81 upper T l plus superscript 4 subscript 2 H e.
Option C
D
Superscript 14 subscript 6 upper C right arrow superscript 14 subscript 7 upper N plus superscript 0 subscript negative 1 e.
Option D
8

Which action can humans take to reduce wave erosion?

A
build drainage systems
B
build houses near coastlines
C
build breakwaters in the ocean
D
reduce vegetation along coastlines
9

Which contributes to the dissolution of sugar in water?

A
the dissociation of an ionic compound in water
B
a strong pull of water molecules on an ionic compound
C
the dissociation of a polar covalent compound in water
D
a strong pull of water molecules on a polar covalent compound
10

Consider the following intermediate chemical equations.What is the enthalpy of the overall chemical reaction ?

Question illustration
A
-999 kJ
B
-250. kJ
C
250. kJ
D
999 kJ
11

Which interaction of the atmosphere with the lithosphere benefits the biosphere?

A
Nitrogen gas is released from volcanoes for plants to use.
B
Groundwater resources are replenished in different regions.
C
Sunlight is available for plant absorption during photosynthesis.
D
Plants rely on water vapor to release oxygen into the atmosphere.
12

A student who is studying atomic reactions creates the following Venn diagram.How should the student label each circle in this diagram?

Question illustration
A
reaction A: chemical; reaction B: nuclear
B
reaction A: nuclear; reaction B: chemical
C
reaction A: strong nuclear; reaction B: weak nuclear
D
reaction A: weak nuclear; reaction B: strong nuclear
13

Which materials are moved by runoff?

A
nutrients
B
vegetation
C
large rocks
D
paved surfaces
14

The main component of smog is . Smog is a product that is formed through the following series of intermediate chemical reactions.What is the overall chemical equation for smog after the above intermediate reactions are combined?

Question illustration
A
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus 2 upper O subscript 3 (g) plus 2 upper O (g) right arrow 8 upper N upper O (g) plus 4 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).
Option A
B
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus upper O subscript 3 (g) plus upper O (g) right arrow 9 upper N upper O (g) plus 3 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).
Option B
C
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) right arrow 3 upper N upper O subscript 2 (g).
Option C
D
Upper N subscript 2 (g) plus 2 upper O subscript 2 (g) right arrow 2 upper N upper O subscript 2 (g).
Option D
15

Which method best helps to prevent wind erosion?

A
rotating crops
B
decreasing riverbank slopes
C
more animal grazing
D
avoiding soil compaction
16

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
17

Which is the best example of water regulating an organism’s body temperature?

A
a jogger sweating after a run
B
a fish passing water over its gills
C
a deer taking a drink from a stream
D
a leaf using water for photosynthesis
18

Which best explains the high surface tension of water?

A
its high density
B
its ion-dipole interactions
C
its adhesive interactions
D
its hydrogen bonding interactions
19

Which gas do plants absorb from the atmosphere during photosynthesis?

A
sulfur
B
oxygen
C
nitric oxide
D
carbon dioxide
20

An example of a radioactive isotope is

A
carbon-12.
B
carbon-14.
C
neon-20.
D
neon-22.

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