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Practice Exam Answers

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1
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Based on these data, what is the average atomic mass of element cap b ?

A
10 point 5 1
B
10 point 8 1
C
10 point 0 1
D
11 point 0 1
2
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How is this model useful?

A
It shows how electrons are distributed in the shells of an iron atom.
B
It shows how electrons are distributed in the shells of a cobalt atom.
C
It shows how orbitals are distributed in the shells of a cobalt atom.
D
It shows how orbitals are distributed in the shells of an iron atom.
3

Which kind of reaction does this graph represent?

A
endothermic because triangle cap h sub rxn is equal to negative 876 point 8 kJ
B
endothermic because triangle cap h sub rxn is equal to 876 point 8 kJ
C
exothermic because triangle cap h sub rxn is equal to negative 1 comma 099 point 6 kJ
D
exothermic because triangle cap h sub rxn is equal to 1 comma 099 point 6 kJ
4

Which statement best describes the process that the diagrams show?

A
A solid gains kinetic energy to become a liquid and then becomes a gas.
B
A gas loses kinetic energy to become a liquid and then becomes a solid.
C
A gas gains kinetic energy to become a liquid and then becomes a solid.
D
A solid loses kinetic energy to become a liquid and then becomes a gas.
5

Why does this tool work to separate the mixture?

A
The broth has a higher melting point than the fat.
B
The broth has a lower boiling point than the fat.
C
The broth has a higher density than the fat.
D
The broth has larger particles than the fat.
6

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

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

Which compound most likely contains polar covalent bonds?

A
AIF sub 3
B
NaCl
C
Br sub 2
D
NF sub 3
8

Which of these is an example of a physical change?

A
solid ice, when heated, turning into liquid water
B
sodium, when exposed to chlorine, forming sodium chloride
C
sugar, when heated, producing carbon dioxide and water
D
aluminum, when heated in air, forming aluminum oxide
9

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

A
It worked only for helium and larger atoms.
B
It contradicted the Heisenberg uncertainty principle.
C
It did not identify the distance between an electron and the nucleus.
D
It stated that spectral lines of atoms are similar.
10

Consider the equation for the formation of water. 2 cap h sub 2 plus cap o sub 2 rightarrow 2 cap h sub 2 cap o What is the theoretical yield of cap h sub 2 cap o if 130 g of cap h sub 2 cap o is produced from 18 g of cap h sub 2 and an excess of cap o sub 2 ?

A
18 g
B
160 g
C
81 g
D
130 g
11

If a compound has a molar mass of 180 g over mol and its empirical formula is cap c cap h sub 2 cap o , what is its molecular formula?

A
cap c cap h sub 2 cap o
B
cap c sub 12 cap h sub 22 cap o sub 11
C
cap c sub 2 cap h sub 4 cap o sub 2
D
cap c sub 6 cap h sub 12 cap o sub 6
12

Which property would xenon most likely have?

A
It is a solid.
B
It is flammable.
C
It is silver in color.
D
It is stable.
13

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

A
g
B
aq
C
l
D
s
14

Which activity best demonstrates Ernest Rutherford’s creativity?

A
summarizing the conclusions from the gold foil experiment as a theory
B
designing an experiment to test the plum pudding model
C
making observations about the gold foil experiment
D
questioning the correctness of the plum pudding model
15

What is produced during the replacement reaction of Cu open paren NO sub 3 close paren sub 2 and Zn ?

A
ZnCu plus 2 NO sub 3
B
ZnNO sub 3 plus Cu
C
Zn open paren NO sub 3 close paren sub 2 plus Cu
D
Zn plus Cu open paren NO sub 3 close paren sub 2
16

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

A
SO sub 3 raised to the 2 minus power
B
Ar
C
Hg sub 2 raised to the 2 plus power
D
NO sub 2 raised to the negative power
17

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

Which of these observations would indicate that a material is a pure substance?

A
It cannot be physically broken down into different types of atoms.
B
It changes color after heating.
C
It can be physically broken down into different types of molecules.
D
It does not dissolve in water.
19

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

A
smaller volume right arrow crowded particles right arrow less collisions right arrow lower pressure
B
more gas particles right arrow more collisions right arrow higher pressure
C
more gas particles right arrow more kinetic energy right arrow more volume right arrow higher pressure
D
smaller volume right arrow crowded particles right arrow more collisions right arrow higher pressure
20

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

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

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