Gas Laws

Why does pumping air into a tire at a constant temperature increase the pressure?

• The temperature increases.

• The number of molecules increases.

• The atmospheric pressure decreases.

• The volume increases.

Which gas law has the assumptions of a fixed amount and temperature of a gas?

• Charles's law

• Boyle's law

• Avogadro's law

• Gay-Lussac's law

Which of the following is the mathematical representation of Gay-Lussac's law?

• P 1 V 1 = V 2/ T 2

• P 1 V 1 = P 2 V 2

• P 1/ T 1 = P 2/ T 2

• V 1/ T 1 = V 2/ T 2

A student increases the temperature of a 200 cm³ balloon from 60°C to 120°C. What will the new volume of the balloon be? (Be careful with units.)

• 400 cm 3

• 236 cm 3

• 200 cm 3

• 100 cm 3

In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm3 of gas. What volume will four tablets produce?

• 800 cm³

• 1200 cm³

• 600 cm³

• 300 cm³

You breathe in 6.0 L of pure oxygen at 298 K and 1,000 kPa to fill your lungs. How many moles of oxygen did you take in? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.)

• 0.05 moles

• 2.42 moles

• 20.0 moles

• 0.41 moles

Tags

NGSS.HS-PS3-1

Consider a gas at STP in a container of 22.4 L. If you apply the ideal gas law, what is the approximate value of n?

• 0.5

• 8.31

• 1

• 224

A protein denatures when you cook it at 60°C. What is that temperature on the Kelvin scale? (^oC + 273 = K)

• 373 K

• 213 K

• 325 K

• 333 K

The average speeds of gas molecules in cylinders A, B, C, and D are 0.01 m/s, 0.005 m/s, 0.1 m/s, and 0.5 m/s, respectively. Which cylinder contains gas that is closest to absolute zero?

• D

• A

• C

• B

Tags

NGSS.HS-PS3-4

Increasing the total pressure above a liquid raises the boiling point. Which of the following best explains why?

• The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is raised.

• The number of molecules with high kinetic energies is increased.

• The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is decreased.

• The number of molecules with high kinetic energies is reduced.