AnswersNY-Chemistry Term 1 HillcrestIntermolecular Forces

Intermolecular Forces Answers

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1
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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.
2
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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.
3

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
4

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.
5

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
6

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.
7

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
8

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.
9

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.
10

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

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