Why does a helium balloon float in air?

• It is less dense than air

• It is more dense than air

• It is colder than the air

• it is hotter than the air

What is the density of water?

• 3 g/mL

• 1 g/mL

• 0.5 g/mL

• 6 g/mL

What is density?

• The amount of mass per volume

• The amount of volume per mass

• The amount of pressure per volume

• The amount of pressure per mass

When a gas is heated, it...

• shrinks

• does not change

• expands

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How could two objects have different volumes, but still have the same mass?

• If they both have the same density

• If the larger object has a lower density

• If the smaller object has a lower density

• If the larger object has a higher density.

If I add salt to water, the mixture becomes...

• less dense than before

• no change

• more dense than before

Tags

NGSS.MS-PS1-2

How can an object float on water?

• If it is more dense than water

• If it is less dense than water

• If it has the same density as water

If a gas's density decreases, its particles are now...

• smaller

• farther apart

• bigger

• closer together

Tags

NGSS.MS-PS1-4

Typically, the particles in a gas are not interacting.

• True

• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

1 milliliter (mL) is a little bit bigger than 1 cubic centimeter (cm³)

• True

• False