$$\frac{25}{150} \times 100 = 16.7\%$$

$$\frac{75}{250} \times 100 = 30\%$$

Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture in which one substance is uniformly dispersed in another.

Question 2

Which statement correctly identifies the solute and solvent in a solution of 10 g NaCl dissolved in 100 mL water?

Accepted Answer

NaCl is the solute; water is the solvent.

Question 3

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 4

A solution is prepared by dissolving 25 g of KCl in 125 g of H\_2O. What is the mass percent (m/m) of KCl in the solution?

Accepted Answer

$$\frac{25}{150} 	imes 100 = 16.7\%$$

Question 5

Which of the following best explains why methanol (CH\_3OH) dissolves in water?

Accepted Answer

Hydrogen bonding occurs between the -OH group of methanol and water.

Question 6

Which statement about solubility and temperature is correct?

Accepted Answer

The solubility of most solids increases as temperature increases.

Question 7

A solution contains 5.0 g of KI in 250.0 mL of solution. What is the molarity (M) of KI? (Molar mass of KI = 166.0 g/mol)

Accepted Answer

$$\frac{5.0}{166.0} = 0.0301$$ mol; $$M = \frac{0.0301}{0.250} = 0.120 M$$

Question 8

Which of the following is true about non-electrolytes?

Accepted Answer

They do not produce ions in water and do not conduct electricity.

Question 9

A solution is described as saturated. What does this mean?

Accepted Answer

It contains the maximum amount of solute that can dissolve at a given temperature.

Question 10

What is the mass/volume percent (m/v) of a solution made by dissolving 75 g of Na\_2SO\_4 in 250 mL of solution?

Accepted Answer

$$\frac{75}{250} 	imes 100 = 30\%$$

Question 11

Which of the following best describes Henry's Law?

Accepted Answer

The solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid.

Question 12

A solution is prepared by dissolving 2.0 g of KOH in 20.0 g of H\_2O. What is the mass percent (m/m) of KOH in the solution?

Accepted Answer

$$\frac{2.0}{22.0} 	imes 100 = 9.1\%$$

Question 13

Which of the following is the correct formula for calculating the molarity (M) of a solution?

Accepted Answer

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

Question 14

How many milliliters of a 6.0 M HCl solution will provide 164 g of HCl? (Molar mass of HCl = 36.5 g/mol)

Accepted Answer

$$\frac{164}{36.5} = 4.49$$ mol; $$V = \frac{4.49}{6.0} = 0.748 L = 748 mL$$

Question 15

A topical antibiotic is 2.0% (m/m) Clindamycin. How many grams of Clindamycin are in 50 g of the solution?

Accepted Answer

$$\frac{2.0}{100} 	imes 50 = 1.0 g$$

Question 16

Which of the following is the correct equation for dilution calculations?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 17

What volume (mL) of a 0.20 M SrCl\_2 solution can be prepared by diluting 50.0 mL of a 1.0 M SrCl\_2 solution?

Accepted Answer

$$V_2$$ = \frac{M_1V_1}{$$M_2$$} = \frac{1.0 	imes 50.0}{0.20} = 250$$ mL

Question 18

Which of the following is a real-world example of a supersaturated solution?

Accepted Answer

Rock candy formed by cooling a sugar solution that contains more sugar than can normally dissolve.

Solutions and Concentration in GOB Chemistry: Study Notes Areeg

스터디 가이드 - 연습 문제