7.1 Lesson 6 Individual Argument W

Watch the video.

Since combination C was the only one that made bubbles, we will watch a video to see what else happens when those two ingredients are mixed together.

1. Watch the video and write down what you see in the space below.

After mixing these ingredients, what could have caused the mass of the system to change?

Sentence frame: When _______________ and _______________ were mixed together, many bubbles were made and the mass went _______________. This means a gas was made.

I know this because (use one or more Key Model Ideas):

Key Model Ideas:

• Gas is a kind of matter. It has mass and takes up space.
• In an open system, matter can go in or out, and this can make the mass change.
• A substance has properties that help us identify it. Some properties are more useful than others.
• Flammability (how easily something burns) is one property of a substance.

What gases could not have been made in this process?

The gas from the elephant’s toothpaste could not have been nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, hydrogen, propane, or air. (Delete those that do not apply.)

When the gas was tested with a flame, it went out / glowed brighter. (Delete one that does not apply)

We can use properties to help identify substances.

When the gas was tested with a flame, we were testing its flammability.

Since the flame went out / glowed brighter (Delete one that does not apply), we know the gas is flammable / not flammable (Delete one that does not apply).

Therefore, it cannot be nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, hydrogen, propane, or air. (Delete those that do not apply.)

Key Model Ideas:

• Gas is a type of matter. It has mass and takes up space.
• In an open system, matter can enter or leave, and this can make the mass change.
• A substance has properties that help us identify it. Some properties are more useful than others.
• Flammability (how easily something burns) is a property.
• Density (how heavy something is for its size) is a property.

Question:

What test could you do on the gas from the elephant’s toothpaste? You could measure the density of the gas.

How would the results help you support or refute the claim?

• If the density matches methane, it could support the claim.
• If the density is very different from methane, it would refute the claim because the gas is not methane.