Question 1

Which type of intermolecular force is primarily responsible for the ability of giant sequoia trees to transport water from their roots to their leaves, as shown in the first image?

Accepted Answer

Hydrogen bonding

Question 2

Which of the following best describes the difference between intramolecular and intermolecular forces?

Accepted Answer

Intramolecular forces hold atoms together within a molecule, while intermolecular forces attract molecules to each other.

Question 3

Which of the following molecules would you expect to have the highest boiling point: $$\mathrm{CH_3OH}$$, $$\mathrm{CH_3CH_2OH}$$, or $$\mathrm{CH_3CH_2CH_2OH}$$? Why?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2OH}$$, because it has the largest molecular mass and can form hydrogen bonds.

Question 4

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is covalently bonded to nitrogen, oxygen, or fluorine.

Question 5

Why does water have a concave meniscus in a glass tube, as shown in the fourth image?

Accepted Answer

The adhesive forces between water and glass are stronger than the cohesive forces among water molecules.

Question 6

Which intermolecular force is present in all substances, including noble gases and non-polar molecules?

Accepted Answer

London dispersion forces

Question 7

Which of the following molecules would have the lowest boiling point: $$\mathrm{H_2$}$$, $$\mathrm{F_2$}$$, $$\mathrm{Cl_2$}$$, $$\mathrm{Br_2$}$$, or $$\mathrm{I_2$}$$?

Accepted Answer

$$\mathrm{H_2$}$$

Question 8

Which property of glycerol, $$\mathrm{C_3H_8O_3}$$, is much higher than that of water due to its ability to form multiple hydrogen bonds?

Accepted Answer

Viscosity

Question 9

Which of the following best explains why DNA strands are held together in a double helix, as shown in the third image?

Accepted Answer

Hydrogen bonds between complementary bases

Question 10

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

Accepted Answer

They are stronger than hydrogen bonds.

Question 11

Which of the following molecules would you expect to have the highest surface tension?

Accepted Answer

$$\mathrm{CH_3OH}$$

Question 12

Which of the following best describes why non-polar molecules such as $$\mathrm{$$CCl_4$$}$$ can exist as liquids at low temperatures?

Accepted Answer

They experience London dispersion forces.

Question 13

Which of the following is NOT a property that increases with stronger intermolecular forces?

Accepted Answer

Vapour pressure

Question 14

Which of the following molecules can form hydrogen bonds with water, increasing its solubility?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 15

Which of the following best explains why the boiling point of $$\mathrm{H_2O} is $$much higher than expected based on its molar mass?

Accepted Answer

It forms hydrogen bonds.

Question 16

Which of the following is the strongest type of intermolecular force?

Accepted Answer

Hydrogen bonding

Question 17

Which of the following best describes the effect of increasing molecular size on London dispersion forces?

Accepted Answer

London dispersion forces increase as molecular size increases.

Question 18

Which of the following best explains why mercury forms a convex meniscus in a glass tube?

Accepted Answer

The cohesive forces among mercury atoms are stronger than the adhesive forces to glass.

Question 19

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

Accepted Answer

Gasoline (hydrocarbons with 8 carbons)

Question 20

Which of the following is a real-life example of hydrogen bonding affecting a biological molecule's structure?

Accepted Answer

The double helix structure of DNA

Lesson 4.7: Intermolecular Forces: Types, Effects, and Physical Properties

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