6th Gr Unit 2-2

When modeling air in a flask, what characteristics of gases did you observe? Choose 2 that apply.

• 1. Air stays in one place.

• 1.  Air stays the same shape.

• 1. Air can be added and removed from a flask. 

• 1. Air takes the shape of its container.

How do your models show that air takes the shape of the container it is in? Choose 2 that apply.

• 1. Air takes the shape of its container because gases spread to take the shape of their container. 

• 1.  If the air was a solid, it would have a fixed shape and not be able to fit into certain containers.

• 1. Air takes the shape of a container because air stays in one place.

• 1. When the shape of a container is a basic square or circle shape, air will spread out; however, if the container is many-sided or an otherwise odd shape, the air is not able to spread out.

Describe what happens to the air as you blow up an inflatable beach toy or an air mattress. Imagine that you are trying to describe the process to another student who was absent from school and does not know what you know about air. Choose 3 that apply.

• 1. 
     

     1. There is empty space between the air, so it is compressed when you add more air to the air mattress.. 

• 1. When you add air to an air mattress, the air mattress will get bigger since air has volume. 

• 1. The pieces of air get smaller as you blow up an air mattress.

• 1. Air has mass and volume, so the air mattress gets bigger and has more mass when air is added to it.

Use your model to describe to a friend what compression means. Choose 2 that apply.

• 1. Compression means squishing the air together and having the same mass in a smaller volume. My model shows this by having the air close together.

• 1. Compression means squishing the air together and having the same mass in a larger volume. My model shows this by having the air far apart.

• 1. Compression means that you take something and fit it into a very small space. My model shows this by having all the air in a small space. 

• 1. Compression means that you take something and fit it into a larger space. My model shows this by having all the air in a large space.

Is a sponge a good model of air? Why or why not? Choose all that apply. Choose 2 that apply.

• 1. A sponge is not a good model for air because it can be compressed. It expands when you are not pressing on it.

• 1. A sponge is a good model for air because it can be compressed because of all the small spaces in it. It expands when you are not pressing on it.

• 1. A sponge is not a good model for air because a sponge does not show how air can be added to or taken away from a container.

• 1. A sponge cannot be a model because it has a specific use and design.

When an area of air is compressed, the particles:

• 1. Get closer together.

• 1. Get further apart.

• 1. Compression does not affect molecules.

• 1. The pressure of compression makes the molecules get smaller and smaller.

What happens to the motion of the molecules when the gas is compressed?

• 1. Compression does not affect the motion of the molecules.

• 2. They go slower.

• 2. They continue to move and collide with each other and the side of the container.

• 2. All of the pressure slows the molecules down until they eventually stop moving.

Chris has two tanks of helium gas. She wants to find out which tank has the most gas in it, so she can blow up balloons for a party. Chris thinks that measuring the masses of the two tanks will help her identify which one contains the most gas. Will comparing the mass of the tanks help Chris know which one has the most gas in it?  Why or why not?

• Chris cannot tell the difference between the tanks by measuring the mass because gas doesn’t have mass that can be measured.

• Chris can tell the difference between the tanks of gas since the one that has the most gas in it will have the most mass. Gas has mass.

• Chris can tell the difference between the tanks of gas since the one that has the least  gas in it will have the most mass.

• Chris cannot tell the difference between the tanks by measuring the mass because gas does not have mass.

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(MS-PS1-2)

Describe how your model can be used to explain what happened in the activity. Choose 2 that apply.

• 1. Some of the liquid becomes a gas and evaporates into the air.

• 1. The liquid is in the container and stays there.

• 1. The paper changes color.

• 1. The particles of ammonia in the air caused the indicator paper to change color.

What is a model of the paper in a flask unable to show? Choose 2 that apply.

• 1. That the paper changed color. 

• 1. How the paper changes color.

• 1. All of the movement of the particles in the flask.

• 1. That the ammonia changed into a gas.