Question 1

A child is drinking soda through a straw, as shown in the image. Which of the following best explains why the liquid rises up the straw when the child sucks on it?

Accepted Answer

The pressure inside the straw becomes lower than the atmospheric pressure outside, so the higher external pressure pushes the liquid up the straw.

Question 2

Which of the following statements about the kinetic molecular theory of gases is INCORRECT?

Accepted Answer

Gas particles experience significant attractive forces between each other.

Question 3

A barometer is used to measure atmospheric pressure. If the atmospheric pressure is 1 atm, what is the height of the mercury column in the barometer?

Accepted Answer

$$760\ 	ext{mm}$$

Question 4

Which property of gases allows a scuba diver to fill a tank with a large amount of air at high pressure?

Accepted Answer

Compressibility

Question 5

A sample of gas occupies $$4.0\ 	ext{L} at$$ $$2.0\ 	ext{atm}. If $$the pressure is increased to $$8.0\ 	ext{atm} at $$constant temperature, what will be the new volume?

Accepted Answer

$$1.0\ 	ext{L}$$

Question 6

Which of the following best describes why gases have much lower densities than solids or liquids?

Accepted Answer

There is a large amount of empty space between gas molecules.

Question 7

A gas sample has a volume of $$2.80\ 	ext{L} at an $$unknown temperature. When cooled to $$0^\circ	ext{C}$$, its volume decreases to $$2.57\ 	ext{L}. $$What was the initial temperature in Kelvin?

Accepted Answer

$$298\ 	ext{K}$$

Question 8

Which of the following is the correct form of the combined gas law?

Accepted Answer

$$\frac{P_1$ V_1$}{T_1$} = \frac{P_2$ V_2$}{T_2$}$$

Question 9

A 4.8 L sample of helium contains $$0.22$$ mol. How many additional moles must be added to obtain a volume of $$6.4 L at $$constant pressure and temperature?

Accepted Answer

$$0.07$$ mol

Question 10

Which of the following is NOT an assumption of the ideal gas law?

Accepted Answer

Gas molecules have significant volume.

Question 11

A basketball is inflated to a pressure of $$24.2\ 	ext{psi}$$ with a volume of $$3.2\ 	ext{L} at$$ $$25^\circ	ext{C}. $$How many moles of gas are inside? ($$1\ 	ext{atm} = 14.7\ 	ext{psi}$$, $$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K})$$

Accepted Answer

$$0.21$$ mol

Question 12

A sample of gas has a mass of $$0.311\ 	ext{g}$$, a volume of $$0.225\ 	ext{L}$$, a temperature of $$55^\circ	ext{C}$$, and a pressure of $$886\ 	ext{mmHg}. $$What is its molar mass? ($$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K}$$, $$1\ 	ext{atm} = 760\ 	ext{mmHg})$$

Accepted Answer

$$28.0\ 	ext{g/mol}$$

Question 13

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

Accepted Answer

High pressure and low temperature

Question 14

A mixture of gases contains $$80\%$$ helium and $$20\%$$ neon at a total pressure of $$1.0\ 	ext{atm}. $$What is the partial pressure of neon?

Accepted Answer

$$0.20\ 	ext{atm}$$

Question 15

At the summit of Mt. Everest, the atmospheric pressure is $$0.311\ 	ext{atm}. $$What is the partial pressure of oxygen if air contains $$21\%$$ oxygen?

Accepted Answer

$$0.065\ 	ext{atm}$$

Question 16

A gas is collected over water at $$25^\circ	ext{C}$$ and a total pressure of $$758\ 	ext{mmHg}. If $$the vapor pressure of water at this temperature is $$23.8\ 	ext{mmHg}$$, what is the partial pressure of the dry gas?

Accepted Answer

$$734\ 	ext{mmHg}$$

Question 17

How many liters of oxygen gas are produced when $$294\ 	ext{g} of$$ $$	ext{KClO}_3$$ completely reacts according to the equation $$2	ext{KClO}_3 ightarrow 2	ext{KCl} + 3	ext{O}_2 at$$ $$755\ 	ext{mmHg}$$ and $$308\ 	ext{K}$$? ($$1\ 	ext{atm} = 760\ 	ext{mmHg}$$, $$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K}$$, molar mass $$	ext{KClO}_3 = 122.5\ 	ext{g/mol})$$

Accepted Answer

$$89.2\ 	ext{L}$$

Question 18

At STP, how many grams of water will form when $$1.24\ 	ext{L} of$$ $$	ext{H}_2$$ completely reacts with $$	ext{O}_2$$?

Accepted Answer

$$1.00\ 	ext{g}$$

Chapter 11: Gases – Properties, Laws, and Applications

Study Guide - Practice Questions

Study Guide - Flashcards