Gas!

Aim 1: If we make rules about how gases behave, what truths must we hold evident?Objective: Learn the postulates of the Kinetic Molecular Theory (KMT)

Aim 2: How are pressure, volume and temperature of gases related?Objectives: -Be able to solve problems relating pressure, volume and temperature -Understand how real gases deviate from the KMT

-Know the conditions under which a real gas will behave more ideally

Kinetic Molecular Theory of Gases1. Particles are in constant, random, straight-line

motion2. As temperature increases, particle motion

increases3. Collisions between particles and with particles

and the container are perfectly elastic4. The volume of the particles themselves are

negligible5. There are no attractions between the particles

1. Constant, straight-line motion

2. As temperature increases, particle motion increases.

3. Collisions between particles are perfectly elastic

4. The volume of gas particles are negligible.

In which picture does the volume of the individual particles contribute to the total volume more?

5. Gas particles are not attracted to each other.

Do gases follow the rules?

An ideal gas follows all the rules of the Kinetic Molecular Theory. Just like an ideal student follows all the rules of school and learning. Do ideal students exist?

In reality, gases do not follow the rules.1. Gas particles ARE attracted to each other.2. Individual gas particles DO have volume.

How can you make a real gas behave more ideally?

Aim: How do pressure, volume and temperature of gases interact ?

1. How are temperature and pressure related? Make a graph, explain the relationship and provide an example.

2. How are temperature and volume related? Make a graph, explain the relationship and provide an example.

3. How are pressure and volume related? Make a graph, explain the relationship and provide an example.

You have 20 minutes to work in groups of 3.

Things to consider…

• What are the definitions of temperature, pressure and volume?

• What exactly are we measuring when we measure these things?

http://www.learnerstv.com/animation/animation.php?ani=123&cat=chemistry

HW: Read Pages 66-69, Answer Questions 47-66 Due Friday (E-Band); Thurs (G-Band)

How does increasing the temperature affect pressure?

Volume must stay constant.

How does increasing the temperature effect volume?

Pressure must stay constant.

How does decreasing the volume affect pressure? Why?

Temperature must stay constant.

How does increasing amount of gas affect the volume?

How do pressure, volume and temperature relate mathematically?

How can you make a real gas behave more ideally?

Which gases would be close to behaving ideally?