Q: Which of the following is the correct formula for calculating mass/volume percent concentration of a solution?

$$\frac{\text{mass of solute (g)}}{\text{volume of solution (mL)}} \times 100$$

Q: A nurse prepares an IV solution by dissolving 5.0 g of glucose in enough water to make 250 mL of solution. What is the mass/volume percent of glucose in the solution?

$$\frac{5.0\,\text{g}}{250\,\text{mL}} \times 100 = 2.0\%$$

Q: What is the molarity of a solution prepared by dissolving 0.50 mol of NaCl in enough water to make 2.0 L of solution?

$$\frac{0.50\,\text{mol}}{2.0\,\text{L}} = 0.25\,\text{M}$$

Q: A patient receives a saline solution that is 0.90% (m/v) NaCl. How many grams of NaCl are present in 500 mL of this solution?

$$0.90\,\text{g} / 100\,\text{mL} \times 500\,\text{mL} = 4.5\,\text{g}$$

Q: A solution is prepared by mixing 10.0 g of KCl in enough water to make 200 mL of solution. What is the mass/volume percent of KCl?

$$\frac{10.0\,\text{g}}{200\,\text{mL}} \times 100 = 5.0\%$$

Q: Which of the following is the correct formula for molarity?

$$\text{Molarity (M)} = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which of the following best describes a solution in chemistry?

Accepted Answer

A homogeneous mixture of two or more substances where the solute is uniformly distributed within the solvent.

Question 2

Which of the following is the correct formula for calculating mass/volume percent concentration of a solution?

Accepted Answer

$$\frac{	ext{mass of solute (g)}}{	ext{volume of solution (mL)}} 	imes 100$$

Question 3

A nurse prepares an IV solution by dissolving 5.0 g of glucose in enough water to make 250 mL of solution. What is the mass/volume percent of glucose in the solution?

Accepted Answer

$$\frac{5.0\,	ext{g}}{250\,	ext{mL}} 	imes 100 = 2.0\%$$

Question 4

Which statement correctly describes the difference between a colloid and a suspension?

Accepted Answer

Colloids have particles that do not settle out, while suspensions have particles that settle out over time.

Question 5

Which of the following solutions will conduct electricity the best?

Accepted Answer

A solution of NaCl in water

Question 6

What is the molarity of a solution prepared by dissolving 0.50 mol of NaCl in enough water to make 2.0 L of solution?

Accepted Answer

$$\frac{0.50\,	ext{mol}}{2.0\,	ext{L}} = 0.25\,	ext{M}$$

Question 7

A patient receives a saline solution that is 0.90% (m/v) NaCl. How many grams of NaCl are present in 500 mL of this solution?

Accepted Answer

$$0.90\,	ext{g} / 100\,	ext{mL} 	imes 500\,	ext{mL} = 4.5\,	ext{g}$$

Question 8

Which of the following best explains why ionic compounds like NaCl dissolve in water?

Accepted Answer

Water molecules surround and stabilize the ions, separating them from the crystal lattice.

Question 9

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

Accepted Answer

NaCl

Question 10

A solution is prepared by mixing 10.0 g of KCl in enough water to make 200 mL of solution. What is the mass/volume percent of KCl?

Accepted Answer

$$\frac{10.0\,	ext{g}}{200\,	ext{mL}} 	imes 100 = 5.0\%$$

Question 11

Which of the following statements about colloids is true?

Accepted Answer

Colloids scatter light due to the size of their particles.

Question 12

Which of the following is the correct formula for molarity?

Accepted Answer

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

Question 13

Which of the following is a real-life example of a colloid?

Accepted Answer

Milk

Question 14

A solution contains 0.25 mol of NaCl in 500 mL of solution. What is its molarity?

Accepted Answer

$$\frac{0.25\,	ext{mol}}{0.500\,	ext{L}} = 0.50\,	ext{M}$$

Question 15

Which of the following best describes the Tyndall effect?

Accepted Answer

The scattering of light by particles in a colloid.

Question 16

Which of the following is NOT a characteristic of a suspension?

Accepted Answer

Particles remain evenly distributed and do not settle out.

Question 17

Which of the following is a weak electrolyte?

Accepted Answer

Acetic acid (CH$$_3$$COOH)

Question 18

A solution is prepared by dissolving 15 g of NaCl in enough water to make 300 mL of solution. What is the mass/volume percent of NaCl?

Accepted Answer

$$\frac{15\,	ext{g}}{300\,	ext{mL}} 	imes 100 = 5.0\%$$

Question 19

Which of the following is the best example of a strong electrolyte used in medical settings?

Accepted Answer

Potassium chloride (KCl)

Ch 9 - Solutions and Their Properties: GOB Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard