Intro to Gases

According to ___________, if you decrease the volume of a container of gas and hold the temperature constant, the pressure of the gas will increase.

• Bernoulli's principle

• Boyle's Law

• Charles's Law

• Archimedes' principle

At STP (Standard Temperature 273 K and Pressure 101.3 kPa), 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

What is diffusion?

• The movement of gas particles from a higher concentration to a lower concentration.

• The rate at which gas flows through the air.

• An explosion of gases.

• The ability of a gas to move from high pressure to a low pressure.

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

• increases
• decreases
• stays the same

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

A sample of O₂ gas has a volume of 2.0 L, a Temperature of 298 K, and a pressure of 100 kPa. Calculate the number of moles of oxygen. R = 8.314

• 495,514 moles of oxygen

• 0.0807 moles of oxygen

• 5.578 moles of oxygen

• 12.39 moles of oxygen

What is zero degrees Celsius converted to Kelvin?

• 100

• 273

• 373

• 212

A 7.00 L sample of argon gas at 420 K exerts a pressure of 625 kPa. If the gas is compressed to 1.25 L and the temperature is lowered to 350 K, what will be its new pressure in kPa?

• 0.000238 kPa

• 2916 kPa

• 4200 kPa

• 93.0 kPa

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

• As the volume increases, the particles slow down, causing less collisions and less pressure.

• As the volume increases, the particles speed up, causing more collisions and more pressure.

• 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.