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Practice Exam Answers

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At what temperature is the substance a heated gas?

A
below 0 times degree C
B
above 100 times degree C
C
between 0 times degree C and 100 times degree C
D
at 100 times degree C
2
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Which substance is a binary acid?

A
hydrochloric acid
B
phosphoric acid
C
nitrous acid
D
sulfuric acid
3

Which of these properties is the best one to use for identification of an element?

A
the number of neutrons in the atomic nucleus
B
the number of isotopes that are formed by the element
C
the number of charges on ions of the element
D
the number of protons in the atomic nucleus
4

Which process is a chemical change?

A
loss of atmospheric ozone
B
breaking of glass
C
magnetization of an iron nail
D
formation of frost
5

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

A
It stated that spectral lines of atoms are similar.
B
It did not identify the distance between an electron and the nucleus.
C
It contradicted the Heisenberg uncertainty principle.
D
It worked only for helium and larger atoms.
6

Which best describes the trends in electronegativity on the periodic table?

A
Electronegativity decreases down and to the right.
B
Electronegativity decreases up and to the left.
C
Electronegativity increases up and to the right.
D
Electronegativity increases down and to the left.
7

Which of these could form an ionic bond with an anion?

A
Ar
B
SO sub 3 raised to the 2 minus power
C
Hg sub 2 raised to the 2 plus power
D
NO sub 2 raised to the negative power
8

How many electrons can the n is equal to 4 shell hold?

A
64
B
16
C
8
D
32
9

Which statement about hydrogen bonds is true?

A
They help water striders walk on water by creating surface tension.
B
They are much stronger than intramolecular forces.
C
They are the weakest of the intermolecular forces.
D
They are the only force that allows a gecko to climb up glass.
10

Which equation is a decomposition reaction?

A
Zn plus HCl rightarrow ZnCl sub 2 plus cap h sub 2
B
Na sub 2 cap o plus CO sub 2 rightarrow Na sub 2 CO sub 3
C
Li sub 2 CO sub 3 rightarrow Li sub 2 cap o plus CO sub 2
D
cap c sub 6 cap h sub 12 cap o sub 6 plus cap o sub 2 rightarrow CO sub 2 plus cap h sub 2 cap o
11

Which property would xenon most likely have?

A
It is a solid.
B
It is silver in color.
C
It is flammable.
D
It is stable.
12

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

A
more gas particles right arrow more kinetic energy right arrow more volume right arrow higher pressure
B
more gas particles right arrow more collisions right arrow higher pressure
C
smaller volume right arrow crowded particles right arrow less collisions right arrow lower pressure
D
smaller volume right arrow crowded particles right arrow more collisions right arrow higher pressure
13

Which of these is an example of a physical change?

A
sugar, when heated, producing carbon dioxide and water
B
solid ice, when heated, turning into liquid water
C
aluminum, when heated in air, forming aluminum oxide
D
sodium, when exposed to chlorine, forming sodium chloride
14

The symbol for xenon Xe would be a part of the noble gas notation for the element

A
antimony.
B
cesium.
C
uranium.
D
radium.
15

How do aromatic hydrocarbons differ from alkenes?

A
Aromatic hydrocarbons are flat, geometric molecules, and alkenes are not.
B
Alkenes are flat, planar molecules, and aromatic hydrocarbons are not.
C
Alkenes are saturated, and aromatic hydrocarbons are unsaturated.
D
Aromatic hydrocarbons are unsaturated, and alkenes are saturated.
16

A plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as a

A
ionized plasma.
B
thermal plasma.
C
nonthermal plasma.
D
low density plasma.
18

Consider the three equations. 7 to the 14th power cap n plus 1 to the 1th power cap h rightarrow 8 to the 15th power cap o 2 to the 4th power He plus 2 to the 4th power He rightarrow 4 to the 8th power Be 14 to the 28th power Si plus 7 sub 2 to the 4th power He rightarrow 28 to the 56th power Ni Which statement do these reactions best support?

A
Chain reactions play important roles in the process of nuclear fission.
B
Alpha decay occurs only in certain atoms.
C
Beta decay occurs only in certain atoms.
D
Nuclear fusion plays an important role in making elements that are heavier than helium.
19

Which activity best demonstrates Ernest Rutherford’s creativity?

A
designing an experiment to test the plum pudding model
B
making observations about the gold foil experiment
C
questioning the correctness of the plum pudding model
D
summarizing the conclusions from the gold foil experiment as a theory
20

Why do natural polymers not pose as much of an issue in landfills as synthetic polymers?

A
Natural polymers are expensive to recycle, and synthetic polymers are cheap to recycle.
B
Natural polymers are cheap to recycle, and synthetic polymers are expensive to recycle.
C
Natural polymers are biodegradable, and synthetic polymers are not biodegradable.
D
Natural polymers are not biodegradable, and synthetic polymers are biodegradable.
21

Which compound most likely contains polar covalent bonds?

A
AIF sub 3
B
Br sub 2
C
NF sub 3
D
NaCl

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