Question 1

Which of the following best explains why table sugar (sucrose) is soluble in water?

Accepted Answer

Sucrose contains hydroxyl groups that form dipole-dipole and hydrogen-bonding interactions with water.

Question 2

What is the primary attractive force responsible for the hydration of sodium chloride ($$\mathrm{NaCl}) in $$water?

Accepted Answer

Ion-dipole interactions

Question 3

A pharmaceutical company wants to increase the water solubility of a new drug candidate. Which chemical modification would most likely achieve this?

Accepted Answer

Adding a carboxylic acid or amine group to create a charged form at physiological pH

Question 4

Pseudoephedrine is converted to pseudoephedrine hydrochloride by reaction with HCl. Why does this increase its solubility in water?

Accepted Answer

The hydrochloride form is ionic and interacts with water through ion-dipole forces.

Question 5

Which of the following compounds would be most soluble in water?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 6

Which of the following compounds would be most soluble in oil?

Accepted Answer

$$\mathrm{CH_3CH_3}$$

Question 7

Fatty acids are described as amphipathic molecules. What does 'amphipathic' mean in this context?

Accepted Answer

They contain both polar and nonpolar regions.

Question 8

Soaps are effective at cleaning greasy dirt because:

Accepted Answer

Their amphipathic structure allows them to form micelles that trap grease inside and interact with water outside.

Question 9

Which statement best describes the structure of a cell membrane?

Accepted Answer

It is a bilayer of phospholipids with polar heads facing the aqueous environments and nonpolar tails facing inward.

Question 10

Cholesterol affects the fluidity of cell membranes by:

Accepted Answer

Increasing rigidity when interacting with unsaturated phospholipid tails and increasing fluidity with saturated tails.

Question 11

Which of the following is NOT a property of a solution?

Accepted Answer

The components react chemically with each other.

Question 12

A mixture of milk and cream is classified as a colloid because:

Accepted Answer

The particles are between 1 and 1000 nm and remain suspended.

Question 13

Which of the following statements about water is TRUE?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonding causes molecules to be farther apart.

Question 14

Which process describes the interaction of water molecules with ions in an aqueous solution?

Accepted Answer

Hydration

Question 15

A solution is saturated when:

Accepted Answer

No more solute can dissolve and a physical equilibrium exists between dissolved and undissolved solute.

Question 16

Which of the following medical conditions is directly related to exceeding solubility limits in the body?

Accepted Answer

Gout and kidney stones

Question 17

How does temperature affect the solubility of most solids and gases in water?

Accepted Answer

Solubility of solids increases and solubility of gases decreases with temperature.

Question 18

According to Henry’s Law, the solubility of a gas in a liquid is:

Accepted Answer

Directly proportional to the pressure of the gas over the liquid.

Question 19

Which of the following best explains why oxygen dissolves into the blood at the lungs?

Accepted Answer

The pressure of oxygen in the air is higher than in the blood, so oxygen diffuses into the bloodstream.

Question 20

Which of the following statements about fats and oils is TRUE?

Accepted Answer

Fats have mostly saturated hydrocarbon tails, allowing for strong London forces and a solid state at room temperature.

Attractive Forces, Solubility, and Solutions: Study Notes for GOB Chemistry

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