Answers NY-Chemistry Term 1 HillcrestIntermolecular Forces

Intermolecular Forces Answers

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Which statement about van der Waals forces is true?

When the forces are weaker, a substance will have higher volatility.

When the forces are stronger, a substance will have lower viscosity.

When the forces are weaker, the boiling point of a substance will be higher.

When the forces are stronger, the melting point of a substance will be lower.

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

Br2 experiences dipole-dipole interactions.

ICl experiences dipole-dipole interactions.

Br2 forms hydrogen bonds.

ICl experiences induced dipole-induced dipole interactions.

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

dipole-dipole

hydrogen bonds

dipole-induced dipole

induced dipole-induced dipole

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

hydrogen bonding

dipole-dipole interaction

dipole-induced dipole interaction

induced dipole-induced dipole interaction

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

about the same.

unpredictable.

lower.

higher.

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?

The molecules will repel each other because of a dipole-dipole interaction.

The molecules will attract each other because of a dipole-dipole interaction.

An induced dipole will be produced in the molecule on the right.

An induced dipole will be produced in the molecule on the left.

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?

Test the boiling points. The polar substance should have a lower boiling point because of its dipole-dipole forces.

Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.

Test the boiling points. The nonpolar substance should have a higher boiling point because of its hydrogen bonds.

Test for an odor. The polar substance should have a higher volatility and weaker odor because of its dipole-dipole forces.

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

Ethane molecules are smaller than water and can move faster.

Water molecules need relatively less heat energy to move.

Water molecules form hydrogen bonds, which cannot be broken by heating water.

Ethane molecules have no hydrogen bonds and need less energy to separate.

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

X’s molecules experience stronger dipole-dipole forces than Y’s molecules.

Y’s molecules experience stronger dipole-dipole forces than X’s molecules.

X’s molecules experience stronger London dispersion forces than Y’s molecules.

Y’s molecules experience stronger London dispersion forces than X’s molecules.

Which forces can be classified as intramolecular?

London dispersion forces

van der Waals forces

hydrogen bonds

covalent bonds

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