Gases

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

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Diffusion is

• the ability of one gas to mix with another gas.
• the rate at which a gas flows through the air.
• an explosion of gases.
• the ability of a gas to move from a high pressure to a low pressure.

Calculate the relative ratio of the rates of effusion (diffusion) of oxygen to nitrogen. Remember to use the equation for Dalton's Law... 

• 4.00
• 1.07
• 3.74
• 0.94

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

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

• increases
• decreases
• stays the same

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? The equation that you need use is the Combined Gas Law.

• 9 L
• 1 L
• 9 kPa
• 1 kPa

A gas has a volume of 22.4 L at STP.  What is the new volume if the pressure is increased to 202.6 kPa and the temperature is decreased to 250 K? You will need to use the combined gas law for this question.

• 10.3 L
• 24.5 L
• 48.9 L
• 20.6 L

How many molecules are there in a 110 L sample of gas at STP?

• 8 x 10²³ molecules
• 8 x 10²⁴  molecules
• 3 x 10²⁴ molecules
• 3 x 10²³ molecules

A sample of pure oxygen gas at STP measures out to be 2.00 L.  How many moles of oxygen is this?

• 24.4 mol
• 0.007 mol
• 1.44 mol
• 0.09 mol