Answers26-27 CFISD TX-Chemistry A CRIntermolecular Forces

Intermolecular Forces Answers

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1
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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.
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

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.
6

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.
7

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.
8

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.
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.

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