Q: A solution contains 10 g of NaCl dissolved in 100 g of water. What is the mass percent ($$\% by $$mass) of NaCl in the solution?

$$\$$\% = \frac{10}{110} \times 100 = 9.09\%$

Q: Which of the following is a correct expression for molarity ($$M$$)?

$$M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Question 1

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which the maximum amount of solute has been dissolved at a given temperature, and any additional solute will not dissolve.

Question 2

Which type of solute is most likely to dissolve in a polar solvent such as water?

Accepted Answer

Ionic compounds

Question 3

A solution contains 10 g of NaCl dissolved in 100 g of water. What is the mass percent ($$\% by $$mass) of NaCl in the solution?

Accepted Answer

$$\$$\% = \frac{10}{110} 	imes 100 = 9.09\%$

Question 4

Which of the following is a correct expression for molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 5

Which statement best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 6

Which of the following acids is a strong acid?

Accepted Answer

Hydrochloric acid ($$HCl)$$

Question 7

A solution has $$[H^+] = 1.0 	imes 10$$^{-4}$$ M. What is the pH of the solution?

Accepted Answer

$$pH = 4$$

Question 8

Which of the following is true about the relationship between $$K_{eq}$$ and $$Q$$ for a chemical reaction at equilibrium?

Accepted Answer

$$K_{eq} = Q$$, the reaction is at equilibrium.

Question 9

Which of the following best describes Le Chatelier's Principle?

Accepted Answer

If a system at equilibrium is disturbed, the system will shift to minimize the disturbance and re-establish equilibrium.

Question 10

Which of the following is NOT a postulate of the kinetic molecular theory of gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 11

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K, assuming ideal behavior?

Accepted Answer

$$1.0 L$$

Question 12

Which of the following conditions would cause a real gas to deviate most from ideal behavior?

Accepted Answer

Low temperature and high pressure

Question 13

Which of the following correctly expresses the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 14

If the pressure of a gas is doubled while the temperature and amount remain constant, what happens to the volume?

Accepted Answer

The volume is halved.

Question 15

A buffer solution is made by mixing acetic acid and sodium acetate. Which component acts as the conjugate base?

Accepted Answer

Sodium acetate

Question 16

Which of the following is the correct formula for calculating pOH from $$[OH^-]$$?

Accepted Answer

$$pOH = -\log[OH^-]$$

Question 17

A titration experiment is performed to determine the concentration of an unknown acid. Which of the following is the most important indicator of the endpoint?

Accepted Answer

The color change of the indicator

Question 18

Which of the following is true about the polarity of solvents and solutes?

Accepted Answer

Polar solvents dissolve polar and ionic solutes best.

Question 19

Which of the following is the correct conversion from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Properties of Liquids and Gases: Solutions, Acids & Bases, Chemical Equilibrium, and Gases

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