YouTube video

YouTube video

Assessment

Interactive Video

Other

7th Grade

Hard

Created by

Lisa Ford

FREE Resource

6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the boat float?

Sulfur Hydraflouride is a very dense gas and the boat surface area is able to float.

Sulfur Hydraflouride has pushed down on the air causing the air to be more dense than usual. This allows the boat to float.

Sulfur Hydraflouride has been added to the insides of the boat and makes it lighter than air.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What just happened

The man in the black shirt is a magician!

The Sulfur Hydarflouride is being scooped from the bottom and then poured into the boat causing all the gas around the boat (in and out to be the same density) the aluminum foil is now heavy enough to sink

The man scoops the compressed air out, which makes room within the tank for the boat to drop down.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Would this work with a plastic boat? (like a beach toy)

Yes. The gas is dense enough to float every type of solid.

No. The gas is dense, but can only float really light objects like spread out the aluminum foil.

No. The gas is having a chemical reaction to the aluminum foil that it would not have with plastic.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Unrelated to the boats...

Why did the people who sucked in the gas have their voices go deeper?

Because the voice box tissue froze up

Because the sound waves travel much faster through dense gas.

Because the voice sound waves were slowed down a lot when traveling through the more dense gas.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Remember the anvil video with mercury, how are the deep voices similar to the way the anvil sounded when the man hit it with a hammer while in the bath of mercury?

Both were passing sound waves much slower through the dense liquids

They are not similar at all.

The mercury and sulfur hydra fluorine are both less dense then air. sound will travel slower through less dense materials.

6.

OPEN ENDED QUESTION

3 mins • 1 pt

Thanks for watching. Out of curiosity, which video did you like best?

Fallon

Steve Spangler

Beat Boxer

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