AnswersChemistryProperties of Matter and Compounds

Practice Test Answers

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1
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Which best describes the process that arrow 1 represents?

A
Molecules are depositing as ice on a surface.
B
Molecules are speeding up during boiling.
C
Molecules are slowing down during condensing.
D
Molecules are moving from stationary positions.
2
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Which statement describes an extensive property of matter?

A
It changes with the amount of sample that is present.
B
It changes when a new substance is formed.
C
It changes with the color of a substance.
D
It changes with the composition of a substance.
3

What does it mean that valence electrons in a metal are delocalized?

A
The valence electrons move between atoms in shared orbitals.
B
The valence electrons move from inner orbitals to outer orbitals of each atom.
C
The valence electrons move from outer orbitals to inner orbitals of each atom.
D
The valence electrons move out of the orbitals and go into the air.
4

Which statement about hydrogen bonds is true?

A
They help water striders walk on water by creating surface tension.
B
They are the only force that allows a gecko to climb up glass.
C
They are the weakest of the intermolecular forces.
D
They are much stronger than intramolecular forces.
5

Which statement is true about a polyatomic ion?

A
It forms covalent bonds with other ions.
B
It is made of atoms that are covalently bonded together.
C
It has a charge that is distributed over only part of the ion.
D
It forms metallic bonds with other ions.
6

Which statement describes effusion?

A
It occurs when gas molecules disperse throughout a container.
B
It occurs when a liquid passes through a tiny hole.
C
It occurs when a gas passes through a tiny hole.
D
It occurs when a liquid disperses throughout a container.
7

When the process of condensation occurs, the kinetic energy of particles

A
easily overcomes the intermolecular forces.
B
is insufficient to overcome intermolecular forces.
C
becomes exactly equal to the intermolecular forces.
D
becomes independent of temperature.
8

How many valence electrons are available for bonding in bromine Br ?

A
one
B
two
C
five
D
seven
9

Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has six nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has four nonbonding electrons.
10

Which of the following most likely requires intermolecular forces?

A
a piece of fruit falling from a branch to the ground
B
a rock maintaining its solid shape
C
a koala using claws to hold onto a tree
D
a spider walking on the bottom of a leaf
11

What is another name for the molecular orbital theory of bonding in metals?

A
electron bond theory
B
ionic bond theory
C
covalent bond theory
D
band theory
12

Which best characterizes a crystal?

A
a high-energy state of matter made up of a swirling, ionized gas
B
a loose association of particles moving past one another
C
a dense substance that is hard and incompressible
D
a number of high speed particles moving randomly
13

Which best describes why NH sub 4 raised to the plus power can form an ionic bond with Cl raised to the negative power ?

A
It has a nitrogen atom that is strongly attracted to Cl raised to the negative power .
B
It has a negative charge that is spread over the entire ion.
C
Its positive charge is attracted to the negative charge of Cl raised to the negative power .
D
Its outermost shell gains one or more electrons from Cl raised to the negative power .
14

Why do amorphous solids not have a long-range order in the arrangement of their particles?

A
Their particles always stay in the same positions.
B
Their formation involves very rapid cooling.
C
Their particles eventually change positions.
D
They do not have enough particles.
15

Which is a postulate of the kinetic-molecular theory?

A
Gas particles are very large in size and always move slowly.
B
Gas particles are very small in size and always move slowly.
C
Gas particles have a small volume relative to the spaces between them.
D
Gas particles have a large volume relative to the spaces between them.
16

Which term best describes liquid behavior under pressure?

A
incompressible
B
immiscible
C
surfactant
D
compressed
17

When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

A
because the metal is malleable
B
because a new substance is formed
C
because the metal begins to melt
D
because the metal reaches a high temperature
18

What is the molecular shape of BF sub 3 ?

A
trigonal planar
B
trigonal pyramidal
C
tetrahedral
D
bent
19

The gas and liquid are at

A
a low vapor pressure.
B
a high vapor pressure.
C
zero vapor pressure.
D
equilibrium.
20

The shape of an NH sub 3 molecule is

A
bent.
B
tetrahedral.
C
trigonal planar.
D
trigonal pyramidal.

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