Kinetic Model of Matter

The gas in a container is heated but is kept at constant volume.

Why does the gas pressure increase?

• The molecules expand.

• The molecules increase in mass.

• The molecules move further apart.

• The molecules move more rapidly.

Tags

NGSS.MS-PS1-4

What happens to the gas molecules when the temperature of the gas increases?

• They move more quickly.

• They move more slowly.

• They vibrate more quickly.

• They vibrate more slowly.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The diagram shows a beaker of water. Four molecules are labelled.

The relative amount of energy of each molecule is shown.

Which molecule is most likely to escape from the liquid?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

The volume of a gas in a sealed syringe is increased. The temperature of the gas does not change.

After this change is made, what has happened to the gas molecules in the syringe?

• They move more quickly.

• They move more slowly.

• They hit the syringe walls less often.

• They hit the syringe walls more often.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which statement about the gas in the jar is correct?

• The gas molecules collide with the inside of the jar more often as the temperature increases.

• The gas molecules move more slowly as the temperature increases.

• The pressure of the gas decreases as the temperature increases.

• The pressure of the gas is higher at the top of the jar than at the bottom of the jar.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

A block of ice cream is prevented from melting by wrapping it in newspaper soaked in water. The water evaporates from the newspaper.

Which molecules escape from the water and what happens to the average speed of the water molecules that remain in the newspaper?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Air in a sealed syringe is slowly compressed by moving the piston. The temperature of the air stays the same. Which statement about the air is correct?

• The pressure of the air decreases because its molecules now travel more slowly.

• The pressure of the air decreases because the area of the syringe walls is now smaller.

• The pressure of the air increases because its molecules now hit the syringe walls more frequently.

• The pressure of the air increases because its molecules now travel more quickly.

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

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

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

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

• 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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which diagram best shows the path of a gas molecule?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1