Amplify Phase Changes

Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving around each other. What will happen to Lily’s substance if she transfers energy into the substance and causes a phase change?

After the phase change, the substance's molecules will move . . .

• faster, and the substance will be a liquid.

• faster, and the substance will be a gas.

• slower, and the substance will be a solid.

• slower, and the substance will be a liquid.

Tags

NGSS.MS-PS1-4

Which phase change occurs when a solid turns to a liquid?

• Melting

• Condensing

• Vaporizing

• Freezing

Tags

NGSS.MS-PS1-4

Which phase change occurs when a liquid turns to a gas?

• Melting

• Condensing

• Evaporating

• Freezing

Tags

NGSS.MS-PS1-4

All phase changes (changing states) requires energy to be added or taken away.

• True

• False

Tags

NGSS.MS-PS1-4

In our Amplify story, the liquid methane lake...

• EVAPORATED

• FROZE

• CONDENSED

• SUBLIMATED

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When the liquid methane lake evaporated...

• the kinetic energy increased and the molecules moved further apart.

• the kinetic energy decreased and the molecules moved further apart.

• the kinetic energy increased and the phase changed to solid methane.

• the kinetic energy decreased and the phase change that occurred was melting.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

In our Amplify story, the methane lake did not evaporate right away because...

• evaporation always takes a long time to occur.

• the kinetic energy from the Sun quickly overcame the molecular attraction in the methane.

• the methane has high molecular attraction, so it took a lot of energy from the Sun to overcome the M.A.

• the lake was in winter up until 2007, so it could not get enough energy from the Sun to vaporize.

Tags

NGSS.MS-PS1-4

There is a safe chemical and a toxic chemical, and both are liquids at room temperature. When the same amount of energy is transferred out of the two chemicals, only the toxic chemical changes phase. How is the toxic chemical different from the safe chemical? The toxic chemical has a . . .

• weaker attraction between its molecules than the safe chemical. Its molecules now move in place.

• stronger attraction between its molecules than the safe chemical. Its molecules now move away from each other.

• stronger attraction between its molecules than the safe chemical. Its molecules now move in place.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The cleaning chemical has a . . .

• weaker attraction between its molecules than the poison. Its molecules now move away from each other.

• stronger attraction between its molecules than the poison. Its molecules now move away from each other.

• weaker attraction between its molecules than the poison. Its molecules now move in place.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to the molecules of a substance during the phase change from liquid to gas?

• They move faster and spread apart.

• They move slower and come closer together.

• They remain stationary.

• They move in a circular motion.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4