Thermodynamics Phase Changes

The graph represents the heating of water in a pot. At 150 seconds, the water has just reached a boil. If the heat is left on, what will happen to the temperature and volume of water in the pot? (All temperatures in °C.)

• The temperature will rise, and the water volume will decrease.

• The temperature will rise, and the water volume will remain constant.

• The temperature will remain constant, and the water volume will decrease

• The temperature will remain constant, and the water volume will remain constant.

Tags

NGSS.MS-PS1-4

Which of the following statements is most accurate?

• When liquid water is heated, the molecules move faster.

• When liquid water is heated, the molecules collide more often.

• When liquid water is heated, collisions between molecules are more violent.

• All of the statements are accurate

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In a pressure cooker, a lid is screwed tightly onto a pot so that the air pressure in the pot is increased. What effect, if any, will this have on the boiling point of water in the pot?

• The boiling point will be raised.

• The boiling point will be lowered.

• The boiling point will be unaffected.

• None of the above.

Tags

NGSS.MS-PS1-4

Which of the following descriptions explains the process of water freezing?

• Water molecules speed up until they escape into a different phase.

• Water molecules slow down until they begin to bond together.

• Water molecules are squeezed together by high pressure until they begin to stick to one another

• As water molecules cool, their shape changes from rounded to irregular, making them more likely to link to one another.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the graphs below illustrates water boiling in Denver, Colorado? (Altitude 1,600 meters above sea level)

• Graph A

• Graph B

• Graph C

• Graph D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What phases are shown in the three images below?

• Image 1 is gas, image 2 is liquid, and image 3 is solid.

• Image 1 is liquid, image 2 is solid, and image 3 is gas.

• Image 1 is solid, image 2 is gas, and image 3 is liquid.

• Image 1 is gas, image 2 is solid, and image 3 is liquid.

Tags

NGSS.MS-PS1-4

What is the phase of water when its temperature is 150 °C?

• Solid

• Liquid

• Gas

• None of the above

Tags

NGSS.MS-PS1-4

What is true of a gas?

• A gas has a fixed shape and will expand or shrink to fill any container.

• A gas has a fixed shape and has the same volume in any container.

• A gas has a changeable shape and will expand or shrink to fill any container.

• A gas has a changeable shape and has the same volume in any container.

Tags

NGSS.MS-PS1-4

An unopened bottle of water is taken out of the refrigerator and placed on a table. After a while, the bottle is covered with droplets of water. What phase change has occurred?

• Melting

• Freezing

• Boiling

• Condensation

Tags

NGSS.MS-PS1-4

Molten lava pours from a volcano in Hawaii. After a few hours, the liquid lava hardens into a shiny gray rock. Which phase change has taken place?

• Melting

• Freezing

• Boiling

• Condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4