AP Chemistry Gases

What are the values for STP?

• 0 K and 1 atm
• 0^oC and 1 atm
• 760 K and 1 atm
• 273^oC and 1 atm

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

What is the pressure in a container that has 3 atm H_2, 2 atm of N₂ and 5 atm of F₂?

• 2 atm

• 3 atm

• 5 atm

• 10 atm

Find the density of neon gas at 0.725 atm and 25°C [M_m =20.18]

• 0.35

• 0.47

• 0.60

• 0.79

An important idea of the kinetic theory is that particles of matter 

• are in constant motion
• have different shapes
• have different colors
• are always fluids

A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.42 L.

• 312K

• 278K

• 20.4K

• 295K

• 552K

How are pressure and temperature related?

• Directly

• Indirectly

• They aren't related

Gas pressure is caused by

• gas molecules colliding with surfaces
• gas molecules condensing to a liquid
• gas molecules hitting other gas molecule
• barometers

• Since all flask have same amount of gas, flask 1 has the least pressure
• Since all flask have same amount of gas, flask 2 has the least pressure
• Since all flask have same amount of gas, flask 3 has the least pressure
• Since all flask have same amount of gas, flask 4 has the least pressure

At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion?

• CO and CO₂

• CO and N₂

• NO₂ and N₂O₄

• N₂O and NO₂

• N₂ and O₂