Quiz

QUIZ

1. What is the best way to describe the pressure of a gas?

a. The weight of the gas when it becomes liquid b. The force of the gas on a container c. The mass of one mole of a gas d. The force of the gas per a certain square area of a container

Answer: d. Pressure of a gas is defined as its force per square area against a container, which is different depending on things like the temperature of the gas.

2. Pascal units are SI units involving what measurement?

a. Pressure of a gas b. Force of a gas c. Weight of a gas d. Volume of a gas

Answer: a. The Pascal unit or Pa of a gas is the pressure of a gas. In the measurement of air pressure at sea level, the pressure of air is 9.81 Pa.

3. What is the measurement known as a Pascal?

a. One kilogram per meter squared of force b. One newton of force per meter squared c. One atmosphere at sea level d. One millimeter of mercury at sea level

Answer: b. The definition of a Pascal is one newton of force applied over one meter squared. This is the SI unit of measurement for chemistry purposes and is abbreviated as Pa.

4. There are three things described in the three gas laws for real gases. What is not described in these three laws?

a. Pressure b. Volume c. Temperature d. Kinetic energy

Answer: d. The three gas laws that have been described include measurements of pressure, volume, and temperature of gases but not kinetic energy.

5. Boyle’s law of gases can predict the relationship between what two factors of gases?

a. Pressure and Temperature b. Temperature and number of molecules c. Pressure and Volume d. Volume and Temperature

Answer: c. Boyle’s law indicates that pressure and volume are inversely proportional to each other when the number of molecules and temperature stays the same.

6. Charles’ Law predicts the relationship with what two factors of gases?

a. Pressure and Temperature b. Temperature and number of molecules c. Pressure and Volume d. Volume and Temperature

Answer: d. The volume and temperature are linearly related to one another in Charles’ law so that, as the temperature increases, so does the volume.

7. The mole ratio of a given gas can best be described as what?

a. A comparison of the weight of a gas compared to the weight of other gases in a mixture. b. A comparison of the weight of a gas compared to the total weight of the mixture. c. The ratio of gas A in a system versus gas B in a system by number of molecules. d. The ratio of the molecule number of a gas compared to the total number of molecules in a mixture.

Answer: d. The mole ratio is based on the number of molecules; it is the number of molecules of a gas in a mixture of gases compared to the total number of molecules in the mixture.

8. In measuring gases, how many torr units equal to one atmosphere of the gas?

a. 273 b. 760 c. 1080 d. 100

Answer: b. The equation that explains this is that 760 torr (or 760 millimeters of mercury) is the same as one atmosphere, which is the atmospheric pressure at sea level.

9. At a given temperature, the kinetic energy of a gaseous mixture is based on what factor?

a. The average of the kinetic energies of the different molecules. b. The sum of the kinetic energies of the different molecules. c. The multiplication of the different kinetic energies of the molecules. d. It is a given number that is irrespective of the different molecules.

Answer: a. The kinetic energy in a gaseous mixture is the average kinetic energies of the different molecules.

10. According to Graham’s law, the rate of effusion of a gas molecule is related to what?

a. The square of the mass of the molecule b. The square root of the mass of the molecule c. Inversely to the square root of the mass of the molecule d. Inversely to the square of the mass of the molecule

Answer: c. The rate of effusion is inversely proportional to the square root of the mass of the molecule. If a molecule is 16 times heavier than another molecule it has one-fourth the rate of effusion of the other molecule.