Experience Chemistry Lesson 9.1: Properties of Gases

​Lesson 9.1: Properties of Gases

The Santa Ana Winds originate inland in the Great Basin and blow towards the ocean. They are very strong winds that are both hot and dry, leading them to contribute to wildfire conditions. What about Gases cause these winds to blow the way they do?

Compressibility

• Gases are unique because of how the particles involved can move to fill its container

  • The volume of the spaces in between molecules​ is larger than the volume of the gas particles put together

  • Gases can be squeezed into a smaller space

• Compressibility: a measure of how much volume decreases under a certain amount of pressure

Experience Chemistry | Lesson 9.1

Gas Pressure and Amount of Gas

• It is easy to predict how gases react due to the kinetic theory of matter

  • Adding more particles to a rigid container does not change the volume of gas, but does change the pressure​

    • More particles = More Collisions = More Pressure

Experience Chemistry | Lesson 9.1

Gas Pressure and Volume

• Decreasing the Volume of a gas increases its pressure

  • A smaller space forces particles to collide​

  • As you push down more and more, it eventually becomes harder because the pressure is so great it takes more force to overcome it

Experience Chemistry | Lesson 9.1

Gas Pressure and Temperature

• Recall: Temperature measures the average kinetic energy of particles

  • Increasing temperature increases the kinetic energy​

• An increase in temperature increases collisions and pressure

Experience Chemistry | Lesson 9.1

Open Ended

A Bike tire will often burst if it hits a rock at too great a speed. Write a quick explanation using the kinetic theory of gas particles for why this might happen.

Open Ended

A car tire will often need to be checked when the weather changes. Use the Kinetic theory of gas particles to explain why this is the case