Boiling and evaporation

A cup contains hot liquid.

Some of the liquid evaporates.

What happens to the mass and what happens to the weight of the liquid in the cup?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

Which statement about evaporation is correct?

• Evaporation causes the temperature of the remaining liquid to decrease.

• Evaporation does not occur from a cold liquid near its freezing point.

• Evaporation does not occur from a dense liquid, such as mercury.

• Evaporation occurs from all parts of a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A gas is stored in a sealed container of constant volume. The temperature of the gas increases.

This causes the pressure of the gas to increase.

What happens to the gas molecules during this pressure increase?

• The average kinetic energy of the molecules increases.

• The average separation of the molecules decreases.

• The average separation of the molecules increases.

• The volume of each molecule increases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

A liquid is evaporating. The liquid is not boiling.

Which statement about the liquid is correct?

• Any molecule can escape, and from any part of the liquid.

• Any molecule can escape, but only from the liquid surface.

• Only molecules with enough energy can escape, and only from the liquid surface.

• Only molecules with enough energy can escape, but from any part of the liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What causes the random, zig-zag movement (Brownian motion) of smoke particles suspended in

air?

• air molecules colliding with smoke particles

• convection currents as the hot smoke rises

• smoke particles colliding with each other

• smoke particles reacting with oxygen molecules in the air

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

A pool of water evaporates. As molecules escape, the temperature of the water left in the pool

changes.

From where do the molecules escape and what is the effect on the temperature of the water in

the pool?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Puddles of rain water remain after a storm. The water in the puddles gradually evaporates.

How does the evaporation affect the temperature of the water remaining in the puddle, and how

does it affect the average speed of the remaining water molecules in the puddle?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

A swimmer feels cold after leaving warm water on a warm, windy day.

Why does she feel cold even though the air is warm?

• The less energetic water molecules on her skin escape quickly.

• The more energetic water molecules on her skin do not escape quickly.

• The water on her skin does not evaporate quickly enough to keep her warm.

• The water on her skin evaporates quickly and cools her skin.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

During evaporation, molecules escape rapidly from the surface of a liquid.

What happens to the average energy of the molecules of the remaining liquid and what happens

to the temperature of the remaining liquid?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Some liquid is poured into a metal dish on a wooden table. The dish, the liquid, the table and the

air around the dish are all at the same temperature.

The temperature of the liquid now starts to decrease.

What could cause this temperature decrease?

• convection currents in the liquid

• conduction of heat through the metal dish

• evaporation of the liquid

• heat radiation from the liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4