Unit 12 Gases for 21-22

When using the ideal gas law, what units are needed for volume?

• liters (L)

• milliliters (mL)

• Kelvin (K)

• atmospheres (atm)

Which of the following is NOT a part of Kinetic Molecular Theory?

• Gas particles have mass and occupy space (the individual particles have volume)
• Gas particles do not have mass and occupy space (the individual particles have volume
• Gas particles move in straight lines
• The more heat energy the gas particles have, the faster they move

At a constant pressure, the volume decreases.  What happens to the temperature?

• increases
• decreases
• stays the same

Under which of the following conditions do REAL gases behave most like IDEAL gases?

• High pressure and high temperature
• High pressure and low temperature
• Low pressure and low temperature
• Low pressure and high temperature

Calculation: At STP (Standard Temperature and Pressure), a gas has a volume of 3.0 L. What is the new volume if the pressure increases to 303.9 kPa?

• 9 L
• 1 L
• 9 kPa
• 1 kPa

Calculation: A sample of pure oxygen gas has a volume of 2.00 L at a pressure of 101.3 kPa. What is the new pressure is the volume is decreased to 0.5 L?

• 203 kPa

• 101 kPa

• 25 kPa

• 405 kPa

What are the values for STP?

• 0 K and 1 atmosphere

• 0ºC and 1 atmosphere

• 32ºF and 1 atmosphere

• 100ºC and 1 atmosphere

What is zero degrees Celsius converted to Kelvin?

• 100

• 273

• 373

• 212

Which of the following explains the change in pressure when volume increases?

• As the volume increases, the particles have more space to move and collide less with the walls , causing pressure to decrease.

• As the volume increases, the particles have more space to move and collide less with the walls , causing pressure to increase.

Calculation: Calculate the volume that a 0.323-mol sample of a gas will occupy at -8^oC and a pressure of 0.900 atm.

• 7.18 L

• 7.81 L

• 4.63 L

• 4.36 L