Whales’ rib cages have adapted to allow them to compress, which lets them dive to great depths. Why is this essential to help them adapt to the pressure of the ocean?

Question

(1 point)
Responses

There is less pressure in the middle of the ocean.

There is less pressure in the middle of the ocean.

There is negative pressure at the surface of the ocean.

There is negative pressure at the surface of the ocean.

There is buoyant pressure at the bottom of the ocean.

There is buoyant pressure at the bottom of the ocean.

There is more pressure as depth increases.

There is more pressure as depth increases.

Answer 1

The correct response is:

There is more pressure as depth increases.

This is essential for whales because as they dive deeper into the ocean, the pressure from the weight of the water above them increases. The ability to compress their rib cages helps them withstand these increased pressures without suffering from internal injuries.

Answer 2

Oil, fat, and wax are unable to dissolve in water even though water is considered the universal solvent. What term BEST describes the atomic structure of molecules that do NOT dissolve in water?

(1 point)
Responses

They are negatively charged molecules.

They are negatively charged molecules.

They are polar molecules.

They are polar molecules.

They are ionic molecules.

They are ionic molecules.

They are nonpolar molecules.

They are nonpolar molecules.

Answer 3

The term that BEST describes the atomic structure of molecules that do NOT dissolve in water is:

They are nonpolar molecules.

Nonpolar molecules do not have a charge and do not interact well with polar solvents like water, leading to their inability to dissolve.

Answer 4

A water strider is an insect that can walk on water. Why is this possible?

(1 point)
Responses

The insect’s mass and the upward force of gravity prevent the breaking of hydrogen bonds between the water molecules.

The insect’s mass and the upward force of gravity prevent the breaking of hydrogen bonds between the water molecules.

The insect’s mass and small surface area in all directions stick to the water molecules.

The insect’s mass and small surface area in all directions stick to the water molecules.

The insect’s mass is supported by the air pressure in all directions and will not break the hydrogen bonds between the water molecules.

The insect’s mass is supported by the air pressure in all directions and will not break the hydrogen bonds between the water molecules.

The insect’s mass is not strong enough to break the hydrogen bonds between the water molecules.

Answer 5

The correct response is:

The insect’s mass is not strong enough to break the hydrogen bonds between the water molecules.

Water striders can walk on water due to the surface tension created by the hydrogen bonds between water molecules, which allows them to support their weight without breaking those bonds.

Answer 6

If you dive deep into a pool, you may need to “pop” your ears due to the hydrostatic pressure. In what direction is the force of this hydrostatic pressure?

(1 point)
Responses

a downward force

a downward force

an upward force

an upward force

a sideways force

a sideways force

a force in all directions

Answer 7

The correct response is:

a force in all directions.

Hydrostatic pressure acts equally in all directions at a given depth in a fluid, which is why you may feel pressure on your ears when diving deep into a pool.