Which of the following statements about volatility are true? Select all that apply.
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.
Required
3 points
3
Question 2
2.
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?
Required
2 points
2
Question 3
3.
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.
Required
2 points
2
Question 4
4.
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?
Required
2 points
2
Question 5
5.
Which of the molecules has the highest boiling point?
Required
2 points
2
Question 6
6.
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?
Required
2 points
2
Question 7
7.
Lone pair(s) of electrons have
an effect on the bond angles of the molecule.
Required
2 points
2
Question 8
8.
Which of the following statements is true about the molecule shown below?
Required
2 points
2
Question 9
9.
A pair of black dots on a molecule (see example above) represent _____.
Required
2 points
2
Question 10
10.
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?
Required
2 points
2
Question 11
11.
The image shows a mixture of polar and nonpolar molecules.
What type of intermolecular force is shown by the dashed yellow line?
Required
3 points
3
Question 12
12.
Which substance has stronger intermolecular attractions?