Experience Chemistry Lesson 9.1: Properties of Gases

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