Intermolecular Forces — Unit test Answers

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1
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Geckos and water striders rely on forces between molecules. Which statement best identifies the forces involved?

A
Geckos use covalent bonds to stick to glass.
B
The type of force that water striders use is stronger than the type of force that geckos use.
C
Water striders use London dispersion forces to walk on water.
D
The type of force that geckos use is attractive, and the type of force that water striders use is repulsive.
2
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Which of the following could form an ionic bond with an anion?

A
Hg22+
B
NO2–
C
SO32–
D
Ar
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 outer orbitals to inner orbitals of each atom.
C
The valence electrons move from inner orbitals to outer orbitals of each atom.
D
The valence electrons move out of the orbitals and go into the air.
4

A plate of the steel hull of a ship develops a large crack when the ship strikes a reef. Analysis of the steel’s composition shows higher-than-normal levels of an element that could explain why the plate cracked instead of bending. Which element is most likely suspected?

A
iron
B
sulfur
C
chromium
D
nickel
5

Which describes a step in the process of forming an ionic bond?

A
A metal atom loses electrons and becomes a positive ion.
B
A metal atom gains electrons and becomes a negative ion.
C
A nonmetal atom loses electrons and becomes a negative ion.
D
A nonmetal atom gains electrons and becomes a positive ion.
6

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

A
ionic bonding
B
metallic bonding
C
covalent bonding
D
hydrogen bonding
7

Which molecular geometry is least likely to occur with sp3 hybridization?

A
tetrahedral
B
trigonal planar
C
bent
D
trigonal pyramidal
8

If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances?

A
The polar substance has a lower boiling point than the nonpolar substance.
B
The nonpolar substance has a lower boiling point than the polar substance.
C
Both substances have similar volatilities.
D
Both substances have similar solubilities.
9

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
10

Which reason best explains why metals are malleable?

A
because they have delocalized electrons
B
because they have localized electrons
C
because they have ionic bonds
D
because they have rigid bonds
11

Which is a property of covalent compounds?

A
They ionize in solution.
B
They tend to be very hard.
C
They have a low boiling point.
D
They have a high melting point.
12

Which statement describes the valence electrons in metallic bonds?

A
They are shared equally between two atoms.
B
They are shared unequally between two atoms.
C
They are shared among many atoms.
D
They are transferred from one atom to another.
13

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 four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.
14

If all of the bonding electrons in a molecule are bonded in two hybrid sp orbitals, which shape does the molecule most likely have?

A
linear
B
tetrahedral
C
trigonal planar
D
trigonal pyramidal
15

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule

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Intermolecular Forces — Unit test Answers…