Question 1

According to the molecular theory of gases, which statement best explains why gases can be compressed much more easily than liquids or solids?

Accepted Answer

Gas molecules are far apart, so there is a lot of empty space between them.

Question 2

A patient inhales, causing their lung volume to increase. According to Boyle’s Law, what happens to the pressure inside the lungs as the volume increases?

Accepted Answer

The pressure decreases because the volume increases.

Question 3

A sample of gas occupies $$2.0\ 	ext{L} at$$ $$1.0\ 	ext{atm}. If $$the pressure is increased to $$4.0\ 	ext{atm} at $$constant temperature, what will be the new volume?

Accepted Answer

$$0.5\ 	ext{L}$$

Question 4

Which equation represents Charles’s Law?

Accepted Answer

$$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 5

A balloon filled with air at $$25^\circ	ext{C}$$ and $$1.0\ 	ext{L} is $$heated to $$75^\circ	ext{C} at $$constant pressure. What is the new volume? (Assume temperatures are converted to Kelvin.)

Accepted Answer

$$1.17\ 	ext{L}$$

Question 6

Which equation represents Gay-Lussac’s Law?

Accepted Answer

$$\frac{P_1$}{T_1$} = \frac{P_2$}{T_2$}$$

Question 7

A gas sample has a pressure of $$2.0\ 	ext{atm} at$$ $$300\ 	ext{K}. If $$the temperature increases to $$600\ 	ext{K} at $$constant volume, what is the new pressure?

Accepted Answer

$$4.0\ 	ext{atm}$$

Question 8

A gas occupies $$3.0\ 	ext{L} at$$ $$2.0\ 	ext{atm}$$ and $$300\ 	ext{K}. $$What will be its volume at $$1.0\ 	ext{atm}$$ and $$600\ 	ext{K}$$? (Use the combined gas law.)

Accepted Answer

$$18.0\ 	ext{L}$$

Question 9

Which of the following best describes the formation of a solution?

Accepted Answer

The solute disperses uniformly throughout the solvent without a chemical reaction.

Question 10

Which of the following is an electrolyte when dissolved in water?

Accepted Answer

Table salt ($$	ext{NaCl})$$

Question 11

Which statement correctly distinguishes between a saturated and an unsaturated solution?

Accepted Answer

A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.

Question 12

How does increasing temperature affect the solubility of most solid solutes in water?

Accepted Answer

Solubility increases as temperature increases.

Question 13

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

$$	ext{AgCl}$$

Question 14

A solution is prepared by dissolving $$10\ 	ext{g} of $$salt in $$90\ 	ext{g} of $$water. What is the mass percent of salt in the solution?

Accepted Answer

$$10\%$$

Question 15

What is the molarity of a solution made by dissolving $$0.5\ 	ext{mol} of $$glucose in enough water to make $$250\ 	ext{mL} of $$solution?

Accepted Answer

$$2.0\ 	ext{M}$$

Question 16

A $$100\ 	ext{mL}$$ sample of $$1.0\ 	ext{M}$$ NaCl solution is diluted to $$400\ 	ext{mL}. $$What is the new concentration?

Accepted Answer

$$0.25\ 	ext{M}$$

Question 17

Which equation is used to calculate the concentration after dilution?

Accepted Answer

$$C_1V_1 = C_2V_2$$

Question 18

A nurse needs to prepare $$500\ 	ext{mL} of a$$ $$0.1\ 	ext{M}$$ KCl solution from a $$1.0\ 	ext{M}$$ stock solution. What volume of stock solution should be used?

Accepted Answer

$$50\ 	ext{mL}$$

Question 19

A $$250\ 	ext{mL}$$ solution contains $$5\ 	ext{g} of $$glucose. What is the mass/volume percent of glucose in the solution?

Accepted Answer

$$2\%$$

Study Guide: Gases and Solutions (Chapters 8 & 9) – CHEM 1303

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