Answers26-27 CFISD TX-Chemistry A CRNomenclature of Covalent Compounds

Intermolecular Forces Answers

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1
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Are hydrogen bonds formed between all molecules?

A
No because hydrogen can only form these bonds with oxygen atoms.
B
No because hydrogen can only form these bonds with highly electronegative atoms.
C
Yes because hydrogen can easily form bonds with atoms that have a neutral charge.
D
Yes because hydrogen can form these bonds with weakly electronegative atoms.
2
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Which forces can be classified as intramolecular?

A
London dispersion forces
B
van der Waals forces
C
hydrogen bonds
D
covalent bonds
3

In the molecule on the left, areas that have a partial negative charge are pink and areas that have a partial positive charge are blue. The molecule on the right is nonpolar. What will most likely happen when these molecules get closer?

Question illustration
A
The molecules will repel each other because of a dipole-dipole interaction.
B
The molecules will attract each other because of a dipole-dipole interaction.
C
An induced dipole will be produced in the molecule on the right.
D
An induced dipole will be produced in the molecule on the left.
4

Which of the following most likely requires intermolecular forces?

A
a spider walking on the bottom of a leaf
B
a rock maintaining its solid shape
C
a koala using claws to hold onto a tree
D
a piece of fruit falling from a branch to the ground
5

Which statement best explains why water has a higher boiling point than ethane?

A
Ethane molecules are smaller than water and can move faster.
B
Water molecules need relatively less heat energy to move.
C
Water molecules form hydrogen bonds, which cannot be broken by heating water.
D
Ethane molecules have no hydrogen bonds and need less energy to separate.
6

In the figure below, two nonpolar molecules are interacting. Which interaction would most likely cause these molecules to repel each other?

Question illustration
A
hydrogen bonding
B
dipole-dipole interaction
C
dipole-induced dipole interaction
D
induced dipole-induced dipole interaction
7

Substances X and Y are both nonpolar. If the volatility of X is higher than that of Y, what is the best explanation?

A
X’s molecules experience stronger dipole-dipole forces than Y’s molecules.
B
Y’s molecules experience stronger dipole-dipole forces than X’s molecules.
C
X’s molecules experience stronger London dispersion forces than Y’s molecules.
D
Y’s molecules experience stronger London dispersion forces than X’s molecules.
8

van der Waals forces can best be described as the attractive or repulsive forces that are formed

A
between oppositely charged ions in a crystal.
B
during dipole-dipole interactions between molecules.
C
when molecules move apart in the absence of other forces.
D
by a random, short-lived redistribution of electrons.
9

Which interaction produces dispersive forces by creating temporary dipoles that induce dipoles in other molecules?

A
dipole-dipole
B
hydrogen bonds
C
dipole-induced dipole
D
induced dipole-induced dipole
10

In comparison to molecules that interact by London dispersion forces only, the melting point of similar-sized molecules forming hydrogen bonds would most likely be

A
about the same.
B
unpredictable.
C
lower.
D
higher.
11

ICl has a higher boiling point than Br2. What is the best explanation for this?

A
Br2 experiences dipole-dipole interactions.
B
ICl experiences dipole-dipole interactions.
C
Br2 forms hydrogen bonds.
D
ICl experiences induced dipole-induced dipole interactions.
12

When a polar molecule causes a charge redistribution in a nonpolar molecule, what are the molecules of the mixture most likely experiencing?

A
dipole-dipole interactions
B
nonpolar-nonpolar interactions
C
dipole-induced dipole interactions
D
induced dipole-induced dipole interactions
13

Hydrogen bonding is necessary for

A
bonding carbon to oxygen.
B
forming double-stranded DNA molecules.
C
decreasing the boiling point of liquids such as water.
D
causing van der Waals interactions.
14

Which forces involve nonpolar molecules?

A
hydrogen bonds and London dispersion forces
B
London dispersion forces and dipole-induced dipole forces
C
dipole-dipole forces and hydrogen bonds
D
dipole-induced dipole forces and dipole-dipole forces
15

Ming has two unknown substances. One is nonpolar, and the other is polar.Which process would most likely help Ming identify which substance is polar and which is nonpolar?

A
Test the boiling points. The polar substance should have a lower boiling point because of its dipole-dipole forces.
B
Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.
C
Test the boiling points. The nonpolar substance should have a higher boiling point because of its hydrogen bonds.
D
Test for an odor. The polar substance should have a higher volatility and weaker odor because of its dipole-dipole forces.
16

Which statement about van der Waals forces is true?

A
When the forces are weaker, a substance will have higher volatility.
B
When the forces are stronger, a substance will have lower viscosity.
C
When the forces are weaker, the boiling point of a substance will be higher.
D
When the forces are stronger, the melting point of a substance will be lower.

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