Question 1

Which of the following statements best describes Boyle's Law?

Accepted Answer

At constant temperature, the pressure and volume of a gas are inversely proportional: $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2.$$

Question 2

A sample of oxygen gas occupies 2.50 L at 1.20 atm. If the pressure increases to 2.40 atm at constant temperature, what will be the new volume?

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 3

Which of the following intermolecular forces is present in all molecular compounds, regardless of their composition?

Accepted Answer

London dispersion forces

Question 4

Which compound would you expect to have the highest boiling point based on intermolecular forces?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 5

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? ($$\mathrm{NaCl}$$ molar mass = $$58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.34\ \mathrm{M}$$

Question 6

Which of the following best describes the structure of a phospholipid bilayer in a cell membrane?

Accepted Answer

Hydrophilic heads face outward toward the aqueous environment, hydrophobic tails face inward.

Question 7

Which of the following is an example of a weak electrolyte?

Accepted Answer

Acetic acid ($$\mathrm{CH}_3\mathrm{COOH})$$

Question 8

A solution contains 0.50 mol of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6) in 1.0 L of $$water. What is the percent concentration by mass if the total mass of solution is 1100 g?

Accepted Answer

$$9.1\%$$

Question 9

Which of the following statements about osmosis is correct?

Accepted Answer

Solvent molecules move from a region of lower solute concentration to higher solute concentration through a semipermeable membrane.

Question 10

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so there are no favorable interactions between them.

Question 11

A 250 mL solution contains 0.10 mol of NaOH. What is the molarity of the solution?

Accepted Answer

$$0.40\ \mathrm{M}$$

Question 12

Which of the following is the correct chemical equation for the hydration of sodium chloride ($$\mathrm{NaCl}) in $$water?

Accepted Answer

$$\mathrm{NaCl}(s) \rightarrow \mathrm{Na}^+(aq) + \mathrm{Cl}^-(aq)$$

Question 13

Which of the following would increase the solubility of a gas in a liquid?

Accepted Answer

Increasing the pressure above the liquid.

Question 14

Which statement best describes the role of an emulsifier in food chemistry?

Accepted Answer

It allows mixing of polar and nonpolar substances by stabilizing the mixture.

Question 15

Which of the following is a correct application of Charles's Law?

Accepted Answer

At constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}.$$

Question 16

A solution is made by diluting 100 mL of 2.0 M HCl to a final volume of 500 mL. What is the final concentration?

Accepted Answer

$$0.40\ \mathrm{M}$$

Question 17

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature.

Question 18

Which of the following is NOT a type of attractive force present in compounds or mixtures?

Accepted Answer

Covalent bonding

Question 19

Which of the following would you expect to be most soluble in water?

Accepted Answer

Ethanol ($$\mathrm{C}_2\mathrm{H}_5\mathrm{OH})$$

Exam 4 Review: Chemical Reactions, Intermolecular Forces, and Solutions (Ch. 7 & 8)

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