Question 1

Which of the following best explains why Alan Eustace needed a pressurized suit during his supersonic skydiving jump from 25.7 miles above Earth?

Accepted Answer

To prevent decompression sickness due to low atmospheric pressure.

Question 2

Which equation correctly represents the relationship between pressure, force, and area?

Accepted Answer

$$P = F \div A$$

Question 3

A scuba diver descends to a depth where the pressure is 3 atm. If the diver inhales 2.0 L of air at the surface (1 atm), what will be the volume of air in the diver's lungs at depth, assuming temperature is constant?

Accepted Answer

$$V_2 = 0.67$$\,L$$

Question 4

Which of the following is NOT a correct unit of pressure?

Accepted Answer

Joule (J)

Question 5

According to Boyle's Law, what happens to the pressure of a gas if its volume is halved at constant temperature?

Accepted Answer

The pressure is doubled.

Question 6

A balloon contains 3.0 L of gas at 300 K. If the temperature increases to 450 K at constant pressure, what is the new volume?

Accepted Answer

$$V_2 = 4.5$$\,L$$

Question 7

Which law states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure?

Accepted Answer

Avogadro's Law

Question 8

What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

Accepted Answer

$$22.4\,L$$

Question 9

A gas sample has a mass of 2.0 g and occupies 1.0 L at STP. What is the density of the gas?

Accepted Answer

$$2.0\,g/L$$

Question 10

Which of the following best describes the kinetic molecular theory's explanation for pressure in a gas?

Accepted Answer

Pressure results from the collisions of gas particles with the walls of the container.

Question 11

A mixture of gases contains oxygen, nitrogen, and carbon dioxide. If the partial pressures are $$P_{O_2$} = 0.21\,atm$$, $$P_{N_2$} = 0.78\,atm$$, and $$P_{CO_2$} = 0.01\,atm$$, what is the total pressure?

Accepted Answer

$$0.99\,atm$$

Question 12

Which equation represents the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 13

A 5.0 g sample of an unknown gas occupies 2.0 L at 1.0 atm and 273 K. What is the molar mass of the gas? (Use $$R = 0.0821\,L\cdot atm/(mol\cdot K))$$

Accepted Answer

$$56.1\,g/mol$$

Question 14

Which of the following statements about real gases is TRUE?

Accepted Answer

Real gases deviate from ideal behavior due to intermolecular forces and the finite volume of molecules.

Question 15

Which of the following is a correct conversion for atmospheric pressure?

Accepted Answer

$$1\,atm = 760\,mmHg$$

Question 16

If the temperature of a gas is doubled at constant volume, what happens to the pressure?

Accepted Answer

The pressure is doubled.

Question 17

Which process describes the movement of gas molecules from high concentration to low concentration?

Accepted Answer

Diffusion

Question 18

A gas sample at 2.0 atm and 300 K occupies 4.0 L. What will be its pressure if the volume is increased to 8.0 L at constant temperature?

Accepted Answer

$$1.0\,atm$$

Question 19

Which of the following best describes the mean free path of a gas molecule?

Accepted Answer

The average distance a molecule travels between collisions.

Question 20

Which of the following is a consequence of increasing the number of gas particles in a fixed volume at constant temperature?

Accepted Answer

The pressure increases.

Gases: Properties, Laws, and Applications – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard