Honor's Chemistry - Molecular Polarity and IMF

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Which of the following statements about volatility are true? Select all that apply.

Volatility is a measure of how easily a liquid evaporates.

Volatility is a measure of how easily a liquid condenses.

Volatile liquids have a large number of molecules in the gas phase above the liquid.

Volatile liquids have a small number of molecules in the gas phase above the liquid.

Stronger intermolecular forces result in higher volatility.

Stronger intermolecular forces result in lower volatility.

Read the following passage and then answer the next two questions.
Graduate students are conducting research on the intermolecular forces of various substances. As part of their research, they conducted two experiments in which they investigated various bulk characteristics of different substances.  In their first experiment, they explored the boiling points of various liquids. In their second experiment, they investigated the melting points of different compounds.

In their first experiment, the graduate students determined the boiling points of pentane, hexane, heptane, and octane
Look at the graph.
Which of the four molecular compounds has the weakest intermolecular forces?

pentane

hexane

heptane

octane

In their second experiment, the graduate students compared the melting points of methane, isopropyl alcohol, zinc chloride, magnesium chloride, and sodium chloride. Look at the graph.
The graph shows that molecular substances tend to melt at __________ temperatures. This is because intermolecular attractions are __________ than ionic bonds.

Organic chemists identified four different liquids of varying volatilities that they want to test further. They want to compare the overall volatility and intermolecular forces of these liquids.
Look at the picture.

For a situation where the beakers are closed, the circles indicate the amount of liquid volatility. A beaker with a large number of circles would have more liquid volatility than a beaker with only a few circles.
Which option correctly ranks the liquids in the order of increasing intermolecular forces?

I<III<II<IV

II<III<I<IV

IV<III<II<I

III<II<I<IV

Which of the molecules has the highest boiling point?

Liquid 4: CH3CH2CH2CH3

Liquid 1: CH4

Liquid 2: CH3CH3

Liquid 3: CH3CH2CH3

Water and ammonia molecules are roughly the same size and the same mass but ammonia boils at -28°F (-33°C) and water boils at 212°F (100°C). What can we conclude about the intermolecular forces between water and ammonia?

Not enough information is given

Ammonia has stronger intermolecular forces

The intermolecular forces are the same strength

Water has stronger intermolecular forces

Lone pair(s) of electrons have
an effect on the bond angles of the molecule.

True

False

Which of the following statements is true about the molecule shown below?

The bonds are polar and the molecule is nonpolar.

The bonds are nonpolar and the molecule is polar.

The bonds are polar and the molecule is polar

The bonds are nonpolar and the molecule is nonpolar.

A pair of black dots on a molecule (see example above) represent _____.

nonpolar bonds

polar molecule

lone pair

polar bonds

The image above shows a pure substance that contains one type of molecule. What type of intermolecular force is represented by the dashed yellow line?

Dipole - dipole

Dipole - induced dipole

London dispersion 

Ionic

The image shows a mixture of polar and nonpolar molecules.

What type of intermolecular force is shown by the dashed yellow line?

London dispersion

Ionic

dipole induced - dipole

dipole-dipole

Which substance has stronger intermolecular attractions?

The nonpolar liquid

Both liquids have the same intermolecular attractive forces.

The polar liquid

Nonpolar molecules _________ contain polar bonds.

never 

may

always 

Which of the following statements about volatility are true? Select all that apply.

Volatility is a measure of how easily a liquid evaporates.

Volatility is a measure of how easily a liquid condenses.

Volatile liquids have a large number of molecules in the gas phase above the liquid.

Volatile liquids have a small number of molecules in the gas phase above the liquid.

Stronger intermolecular forces result in higher volatility.

Stronger intermolecular forces result in lower volatility.

In their first experiment, the graduate students determined the boiling points of pentane, hexane, heptane, and octane
Look at the graph.
Which of the four molecular compounds has the weakest intermolecular forces?

pentane

hexane

heptane

octane

Organic chemists identified four different liquids of varying volatilities that they want to test further. They want to compare the overall volatility and intermolecular forces of these liquids.
Look at the picture.


For  a situation where the beakers are closed, the circles indicate the amount of liquid volatility. A beaker with a large number of circles would have more liquid volatility than a beaker with only a few circles.
Which option correctly ranks the liquids in the order of increasing intermolecular forces?

I<III<II<IV

II<III<I<IV

IV<III<II<I

III<II<I<IV

Which of the molecules has the highest boiling point?

Liquid 4: CH3CH2CH2CH3

Liquid 1: CH4

Liquid 2: CH3CH3

Liquid 3: CH3CH2CH3

Water and ammonia molecules are roughly the same size and the same mass but ammonia boils at -28°F (-33°C) and water boils at 212°F (100°C). What can we conclude about the intermolecular forces between water and ammonia?

Not enough information is given

Ammonia has stronger intermolecular forces

The intermolecular forces are the same strength

Water has stronger intermolecular forces

Lone pair(s) of electrons have 
an effect on the bond angles of the molecule.

True

False

Which of the following statements is true about the molecule shown below?

The bonds are polar and the molecule is nonpolar.

The bonds are nonpolar and the molecule is polar.

The bonds are polar and the molecule is polar

The bonds are nonpolar and the molecule is nonpolar.

A pair of black dots on a molecule (see example above) represent _____.

nonpolar bonds

polar molecule

lone pair

polar bonds

The image above shows a pure substance that contains one type of molecule. What type of intermolecular force is represented by the dashed yellow line?

Dipole - dipole

Dipole - induced dipole

London dispersion 

Ionic

The image shows a mixture of polar and nonpolar molecules.

 What type of intermolecular force is shown by the dashed yellow line?

London dispersion

Ionic

dipole induced - dipole

dipole-dipole

Which substance has stronger intermolecular attractions?

The nonpolar liquid

Both liquids have the same intermolecular attractive forces.

The polar liquid

Nonpolar molecules _________ contain polar bonds. 

never 

may

always 

Honor's Chemistry - Molecular Polarity and IMF

Honor's Chemistry - Molecular Polarity and IMF

Which of the following statements about volatility are true? Select all that apply.

In their first experiment, the graduate students determined the boiling points of pentane, hexane, heptane, and octaneLook at the graph.Which of the four molecular compounds has the weakest intermolecular forces?

Which of the molecules has the highest boiling point?

Water and ammonia molecules are roughly the same size and the same mass but ammonia boils at -28°F (-33°C) and water boils at 212°F (100°C). What can we conclude about the intermolecular forces between water and ammonia?

Lone pair(s) of electrons have an effect on the bond angles of the molecule.

Which of the following statements is true about the molecule shown below?

A pair of black dots on a molecule (see example above) represent _____.

The image above shows a pure substance that contains one type of molecule. What type of intermolecular force is represented by the dashed yellow line?

The image shows a mixture of polar and nonpolar molecules. What type of intermolecular force is shown by the dashed yellow line?

Which substance has stronger intermolecular attractions?

Nonpolar molecules _________ contain polar bonds.

In their first experiment, the graduate students determined the boiling points of pentane, hexane, heptane, and octane
Look at the graph.
Which of the four molecular compounds has the weakest intermolecular forces?

Lone pair(s) of electrons have
an effect on the bond angles of the molecule.

The image shows a mixture of polar and nonpolar molecules.

What type of intermolecular force is shown by the dashed yellow line?