Q: Which of the following statements about London dispersion forces is correct?

They increase with increasing molecular size and mass.

Q: A student claims that CH$_3$CH$_2$OH and CH$_3$CH$_2$CH$_3$ have similar boiling points because they have similar molar masses. Is this claim correct? Why or why not?

No, because CH$_3$CH$_2$OH can form hydrogen bonds, which are much stronger than the dispersion forces in CH$_3$CH$_2$CH$_3$.

Q: Which of the following best explains why noble gases like Krypton and Xenon can be liquefied at low temperatures?

They experience London dispersion forces that become significant at low temperatures.

Q: Which of the following best describes the relationship between intermolecular forces and the temperature at which a substance changes state?

Stronger intermolecular forces result in higher melting and boiling points.

Q: Which of the following best explains why CH$_3$CH$_2$OH has a higher boiling point than CH$_3$CH$_2$CH$_3$?

CH$_3$CH$_2$OH forms hydrogen bonds, while CH$_3$CH$_2$CH$_3$ only has London dispersion forces.

Question 1

Which of the following molecules exhibits hydrogen bonding as its strongest intermolecular force?

Accepted Answer

NH$_3$

Question 2

Which statement best explains why water (H$_2$O) has a much higher boiling point than methane (CH$_4$)?

Accepted Answer

Water forms hydrogen bonds, while methane only exhibits London dispersion forces.

Question 3

Which of the following correctly ranks the boiling points of Cl$_2$, Br$_2$, and F$_2$ from lowest to highest?

Accepted Answer

F$_2$ < Cl$_2$ < Br$_2$

Question 4

Which intermolecular force is primarily responsible for the high boiling point of HF compared to HCl?

Accepted Answer

Hydrogen bonding

Question 5

Given the following molecules, which has the greatest intermolecular force: NH$_3$, Krypton, HCl, CHCl$_3$, XeF$_2$?

Accepted Answer

NH$_3$

Question 6

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They increase with increasing molecular size and mass.

Question 7

Which molecule would you expect to have the highest viscosity at room temperature?

Accepted Answer

CH$_3$(CH$_2$)$_2$OH

Question 8

Which of the following pairs of molecules would you expect to have the greatest difference in boiling points due to their intermolecular forces?

Accepted Answer

NH$_3$ and PH$_3$

Question 9

A student claims that CH$_3$CH$_2$OH and CH$_3$CH$_2$CH$_3$ have similar boiling points because they have similar molar masses. Is this claim correct? Why or why not?

Accepted Answer

No, because CH$_3$CH$_2$OH can form hydrogen bonds, which are much stronger than the dispersion forces in CH$_3$CH$_2$CH$_3$.

Question 10

Which of the following best explains why noble gases like Krypton and Xenon can be liquefied at low temperatures?

Accepted Answer

They experience London dispersion forces that become significant at low temperatures.

Question 11

Which of the following substances would you expect to have the lowest boiling point?

Accepted Answer

C$_2$H$_6$

Question 12

Which intermolecular force is present in all substances, regardless of their polarity?

Accepted Answer

London dispersion forces

Question 13

Which of the following molecules would you expect to have the highest melting point?

Accepted Answer

Br$_2$

Question 14

Which of the following best describes the relationship between intermolecular forces and the temperature at which a substance changes state?

Accepted Answer

Stronger intermolecular forces result in higher melting and boiling points.

Question 15

Which of the following molecules is most likely to be miscible with water?

Accepted Answer

CH$_3$CH$_2$OH

Question 16

Which of the following molecules would you expect to have the strongest dipole-dipole interactions?

Accepted Answer

HCl

Question 17

Which of the following is NOT a type of intermolecular force?

Accepted Answer

Covalent bonding

Question 18

Which of the following molecules would you expect to have the lowest viscosity?

Accepted Answer

C$_2$H$_6$

Question 19

Which of the following molecules is most likely to be a gas at room temperature?

Accepted Answer

CH$_4$

Question 20

Which of the following best explains why CH$_3$CH$_2$OH has a higher boiling point than CH$_3$CH$_2$CH$_3$?

Accepted Answer

CH$_3$CH$_2$OH forms hydrogen bonds, while CH$_3$CH$_2$CH$_3$ only has London dispersion forces.

CHM.CHP.10

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