Question 1

Which of the following best explains why iodine (I2) is a solid, bromine (Br2) is a liquid, and chlorine (Cl2) is a gas at room temperature?

Accepted Answer

The strength of intermolecular forces decreases from I2 to Cl2.

Question 2

Which of the following statements about intermolecular and intramolecular forces is correct?

Accepted Answer

Intramolecular forces hold atoms together within a molecule, while intermolecular forces act between molecules.

Question 3

Which of the following molecules can form hydrogen bonds?

Accepted Answer

H2NNH2

Question 4

What is the main reason water beads up on a lotus leaf?

Accepted Answer

The leaf is coated with hydrocarbons, making it superhydrophobic.

Question 5

Which of the following best describes dispersion forces?

Accepted Answer

They arise from temporary fluctuations in electron distribution.

Question 6

Which of the following factors increases the strength of dispersion forces in a molecule?

Accepted Answer

Increasing the molecular weight

Question 7

Which of the following is true about the boiling points of H2, Ne, CO, HF, and BaCl2?

Accepted Answer

BaCl2 has the highest boiling point due to strong ionic forces.

Question 8

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

Accepted Answer

Surface tension

Question 9

Why does ice float on liquid water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds create an open structure.

Question 10

Which of the following best describes capillary action?

Accepted Answer

It is the rise of a liquid up a narrow tube due to adhesive and cohesive forces.

Question 11

A 3.50 g sample of acetone is placed in a 2.00 L container at 22°C. The vapor pressure of acetone at this temperature is 5.33 kPa. How many grams of liquid acetone remain after equilibrium is reached? (Molar mass of acetone = 58.08 g/mol, $$R = 8.314 L$$·kPa/mol·K, $$T = 295.15 K)$$

Accepted Answer

$$3.25 g$$

Question 12

Which of the following statements about phase changes is correct?

Accepted Answer

The temperature remains constant during a phase change.

Question 13

Which of the following best explains why the boiling point of water is much higher than expected based on its molecular weight?

Accepted Answer

Water forms strong hydrogen bonds.

Question 14

Which of the following is true about the Clausius–Clapeyron equation?

Accepted Answer

It relates the vapor pressure of a liquid to its temperature.

Question 15

Which of the following is NOT a property affected by intermolecular forces?

Accepted Answer

Atomic number

Question 16

Which of the following best describes a supercritical fluid?

Accepted Answer

A state where the liquid and gas phases are indistinguishable.

Question 17

Which of the following is a correct statement about liquid crystals?

Accepted Answer

They have properties intermediate between those of liquids and solids.

Question 18

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

Accepted Answer

Ion-dipole interactions

Question 19

A 25.0 g sample of isobutane (C4H10) is heated from -50°C to 40°C. The molar specific heat of liquid isobutane is 129.7 J/mol·K, and for the gas it is 95.2 J/mol·K. The heat of vaporization is 21.3 kJ/mol, and the boiling point is -12°C. What is the total heat required for this process? (Molar mass = 58.12 g/mol)

Accepted Answer

$$13.41 kJ$$

Liquids and Intermolecular Forces: States of Matter and Their Properties

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