Introduction to Gases

Gas Laws

By Angie Collins

• Indefinite volume: fills the container ​

• Takes the shape of the container (same as a liquid)​

• Has mass (all matter has mass) ​

Gas Properties

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Multiple Choice

Which is a quality that only gases display?

• Spread out to fill all available space

• Can be compressed

• Take the shape of their container

• All of these

Multiple Choice

Gas molecules have no mass

• Fales

• True

Multiple Choice

Gas has no definite volume

• Fales

• True

Kinetic Molecular Theory

1. Gad particles have volume and empty space

   1. Large number of particles far apart most of the volume is empty space

2. ​No attraction or repultions between the particles.

   1. The Kinetic energy overcomes the attractions forces

3. ​Particle are in constant, linear, random motion

4. Collisions are elastic - no kinetic energy is lost in a collision

5. ​Kinetic Energy is directly proportional to temperature

Subject | Subject

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Multiple Select

How do gas molecules move?

• in a circular motion

• in straight line paths

• in an orderly fashion

• constantly and randomly

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Multiple Choice

Which container will have lower pressure?

• First container

• second container

Multiple Choice

Boyle's PV law : When _______ is held constant, the pressure and volume of a gas are ________ proportional

• temperature, equally

• temperature, inversely

• mass, equally

• mass, inversely

Multiple Choice

Boyle's law : The pressure and volume of a gas show a _____ relationship.

• Inverse

• Direct

Multiple Choice

Whose law states that as pressure goes up, volume goes down?

• Mazias

• Boyle

• Charles

• Aglow

Multiple Choice

Charles' Law States...

• As Volume goes up temperature goes up 

• As Pressure goes down volume goes down 

• As Pressure goes up volume goes down

• As Pressure goes up temperature goes up

Multiple Choice

You leave a soccer ball outside in the winter. Will the ball end up flatter than it was before?

• Only if it's REALLY cold

• No

• Only if it has a leak

• Yes

Multiple Choice

As temperature rises ___________.

• an atom's kinetic energy decreases

• an atom's kinetic energy increases

• an atom's kinetic energy stays the same

Multiple Choice

The more energy that particles have, the ___ they move.

• faster

• slower

Open Ended

Write down any observations you remember from watching the video.

Questions to think about

• Which variables are changing in the video?

• Which variable stayed constant?

• Why did the marshmallows expand?

• Why did the marshmallows shrink?

• As one variable ____, the other variable ____

Fill in the Blank

As pressure increases, volume decreases.

As pressure decreases, volume increases.

Pressure and volume are _____ proportional.

Open Ended

Looking at the image, what are your observations?

Questions to think about

• Which variables are changing in the image?

• Which variable stayed constant?

• What is the name of the gas law being demonstrated?

• Where can we take the balloon if we want it to expand?

• What will happen to the volume of the balloon if we take it outside in Alaska at night?

Fill in the Blank

As temperature increases, volume increases.

As temperature decreases, volume decreases.

Temperature and volume are _____ proportional.

Open Ended

Looking at the image, what are your observations?

Questions to think about

• What variable is changing when the water is boiled and in what direction?

• If the boiler is turned off and ice is added to the water, what will happen?

• What is the name of the gas law being demonstrated?

Fill in the Blank

As temperature increases, pressure increases.

As temperature decreases, pressure decreases.

Temperature and pressure are _____ proportional.