Q: Which of the following best describes why NaCl dissolves readily in water but not in oil?

Water is polar and can stabilize the Na\textsuperscript{+} and Cl\textsuperscript{–} ions through ion-dipole interactions, while oil is nonpolar and cannot.

Q: Which of the following would increase the solubility of CO\textsubscript{2} gas in water?

Increasing the pressure of CO\textsubscript{2} above the water

Q: A sealed cooler contains grapes and dry ice (solid CO\textsubscript{2}). After several hours, the grapes taste carbonated. Which principle explains this phenomenon?

Increasing the pressure of CO\textsubscript{2} increases its solubility in the grapes.

Question 1

Which of the following best describes why NaCl dissolves readily in water but not in oil?

Accepted Answer

Water is polar and can stabilize the Na	extsuperscript{+} and Cl	extsuperscript{–} ions through ion-dipole interactions, while oil is nonpolar and cannot.

Question 2

Which of the following mixtures is a true solution rather than a colloid or suspension?

Accepted Answer

Saltwater

Question 3

Which intermolecular force is primarily responsible for the solubility of H	extsubscript{2}O in HF?

Accepted Answer

Hydrogen Bonding

Question 4

A student tries to dissolve butane (C	extsubscript{4}H	extsubscript{10}) in water. What is the most likely observation and why?

Accepted Answer

Butane forms a separate layer because it is nonpolar and water is polar.

Question 5

Which of the following best explains why increasing temperature generally increases the solubility of most solid solutes in water?

Accepted Answer

Higher temperature increases the entropy (disorder), making dissolution more favorable.

Question 6

Which of the following statements about solutions is correct?

Accepted Answer

Solutions are homogeneous mixtures with particle sizes less than 2.0 nm.

Question 7

Which of the following would increase the solubility of CO	extsubscript{2} gas in water?

Accepted Answer

Increasing the pressure of CO	extsubscript{2} above the water

Question 8

Which of the following best describes the role of detergents in cleaning oily stains with water?

Accepted Answer

Detergents act as emulsifiers, allowing polar water and nonpolar oil to mix.

Question 9

Which of the following compounds would be most soluble in a nonpolar solvent like hexane?

Accepted Answer

CH	extsubscript{4}

Question 10

A sealed cooler contains grapes and dry ice (solid CO	extsubscript{2}). After several hours, the grapes taste carbonated. Which principle explains this phenomenon?

Accepted Answer

Increasing the pressure of CO	extsubscript{2} increases its solubility in the grapes.

Question 11

Which of the following best describes why oil and vinegar separate after being shaken together?

Accepted Answer

Polar vinegar molecules are more attracted to each other than to nonpolar oil molecules.

Question 12

Which of the following is an example of a solid solution?

Accepted Answer

Brass (an alloy of copper and zinc)

Question 13

Which of the following gases is most soluble in water?

Accepted Answer

NH	extsubscript{3}

Question 14

Which of the following best explains why polar molecules are generally soluble in water?

Accepted Answer

Polar molecules form favorable dipole-dipole or hydrogen bonding interactions with water.

Question 15

Which of the following statements about colloids is correct?

Accepted Answer

Colloids can be separated by centrifugation.

Question 16

Which of the following best describes the effect of increasing temperature on the solubility of gases in water?

Accepted Answer

It decreases gas solubility.

Question 17

Which of the following is the best example of a homogeneous mixture?

Accepted Answer

Air

Question 18

Which of the following best explains why methyl alcohol (CH	extsubscript{3}OH) is soluble in water?

Accepted Answer

It is polar and can form hydrogen bonds with water.

Question 19

Which of the following is NOT a way to increase the solubility of a solid in water?

Accepted Answer

Increasing the pressure above the solution

Question 20

Which of the following best describes the molecular process of solvolysis?

Accepted Answer

The solvent molecules interact favorably with solute molecules, leading to dissolution.

Solutions and Solubility: Molecular Interactions and Effects

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