Question 1

Which statement best explains why ice is less dense than liquid water?

Accepted Answer

Hydrogen bonds in ice form a rigid lattice with large gaps, making ice less dense than liquid water.

Question 2

Which of the following molecules would you expect to have the highest boiling point, and why?

Accepted Answer

Ethanol, because it can form hydrogen bonds.

Question 3

Which intermolecular force is primarily responsible for the high viscosity of glycerol?

Accepted Answer

Hydrogen bonding

Question 4

Why does water exhibit a high surface tension compared to many other liquids?

Accepted Answer

Water molecules form extensive hydrogen bonds, creating strong cohesive forces.

Question 5

Which property of liquids is defined as the energy required to increase the surface area of a liquid?

Accepted Answer

Surface tension

Question 6

Which of the following best describes the role of hydrogen bonding in the structure of DNA?

Accepted Answer

Hydrogen bonds hold complementary strands of DNA together by pairing specific nucleotides.

Question 7

Which of the following is NOT a consequence of surface tension?

Accepted Answer

Water molecules evaporating more quickly at room temperature

Question 8

Which type of non-covalent interaction has the highest typical energy (kJ/mol) according to the summary table?

Accepted Answer

Ion-ion interaction

Question 9

A droplet of water on a wax surface forms a contact angle of 100°. What does this indicate about the surface?

Accepted Answer

The surface is hydrophobic.

Question 10

Which of the following best explains why mercury has a much higher surface tension than water?

Accepted Answer

Mercury has strong metallic bonding between atoms.

Question 11

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

Accepted Answer

Ethanol

Question 12

Which of the following statements about hydrogen bonding in water is correct?

Accepted Answer

In liquid water, hydrogen bonds are constantly forming and breaking.

Question 13

Which of the following is an example of a dipole-dipole interaction?

Accepted Answer

$$\mathrm{CH_3Cl}$$ interacting with $$\mathrm{CH_3Cl}$$

Question 14

Which property of liquids is most directly responsible for the ability of a water strider to walk on water?

Accepted Answer

Surface tension

Question 15

Which of the following best describes the difference between cohesive and adhesive forces?

Accepted Answer

Cohesive forces are between like molecules; adhesive forces are between unlike molecules.

Question 16

Which of the following molecules would you expect to be superhydrophobic based on its surface properties?

Accepted Answer

Polytetrafluoroethylene (Teflon)

Question 17

Which of the following is a real-world consequence of high surface tension in water?

Accepted Answer

Water forms droplets on hydrophobic surfaces.

Question 18

Which intermolecular force is responsible for the interaction between $$\mathrm{Na^+}$$ and $$\mathrm{H_2O}$$?

Accepted Answer

Ion-dipole interaction

Question 19

Which of the following best explains why ethylene glycol has a much higher boiling point than ethanol?

Accepted Answer

Ethylene glycol has a higher molar mass and more hydrogen bonding sites.

Question 20

Which of the following is NOT a type of non-covalent interaction?

Accepted Answer

Metallic bond

Intermolecular Forces and Properties of Liquids: Hydrogen Bonding, Surface Tension, and Wetting

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