Two different cars, the Model S and Model T, use different substances in their engines. The image above shows the two substances. At room temperature, both substances are liquids. A car mechanic transferred the same amount of energy out of the two containers, but only one substance changed phase. Which car’s substance changed phase, and how did it change?

The Model T’s substance changed phase because the attraction of the molecules was able to overcome their slower movement. Its molecules now move in place.

The Model T’s substance changed phase because the strong attraction between the molecules made their movement slower. Its molecules now move in place.

The Model S’s substance changed phase because the weak attraction between the molecules allowed them to move faster. Its molecules now move around each other.

The Model S’s substance changed phase because the attraction was able to overcome the slower molecules. Its molecules now move away from each other.

An Earth scientist brought an unknown substance from underground back to her lab. The substance was in the gas phase and was put into a sealed tank as shown. She slowed down the molecules inside the tank and the substance changed phase. How did she do this, and how did it affect the molecules? She transferred energy . . .

out of the substance, and the molecules moved around each other.

into the substance, and the molecules moved around each other.

into the substance, and the molecules moved away from each other.

out of the substance, and the molecules moved in place.

Scientists have a container of water. Water can be a solid, liquid, or gas. At first, the water molecules in the container were moving around each other. Later, the water molecules were moving in place. What change did the scientists observe?

At first, the water was a liquid. After, it was a solid.

At first, the water was a gas. After, it was a liquid.

At first, the water was a solid. After, it was a liquid.

At first, the water was a liquid. After, it was a gas.

The image shows information about two different substances in sealed containers. At room temperature, both substances are liquids. A scientist transfers the same amount of energy into both substances. One substance changes phase, but the other does not. Which chemical changed phase, and why did it change?

Substance A changed phase because its molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.

Substance A changed phase because the weak attraction between its molecules allowed them to move faster. Its molecules now move away from each other.

Substance B changed phase because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.

Substance B changed phase because the strong attraction between molecules made their movement slower. Its molecules now move in place.

This is a model of what happens to the molecules of a substance after a change

Most likely the freedom of movement of the molecules changed.

Energy was probably transferred into the system to make the change happen.

The substance probably went through melting.

Most likely the substance was a solid before and a gas after.

A car mechanic had a sealed bucket containing a substance in the gas phase. She left the bucket outside over the weekend. When she returned, the substance had changed phase, and the substance was in the liquid phase. What happened to the molecules of this substance?

Before the mechanic left, the molecules were moving away from each other . When she returned, they were moving around each other .

Before the mechanic left, the molecules were moving around each other . When she returned, they were moving in place .

Before the mechanic left, the molecules were moving around each other . When she returned, they were moving away from each other .

Before the mechanic left, the molecules were moving in place . When she returned, they were moving around each other .

Whether or not a phase change occurs is determined by the interaction between the _________ of the molecules and the ________ pulling the molecules together.

kinetic energy, freedom of movement

Phase Change Unit Review Practice Questions

Authored by Darren Fix

Science

8th Grade

NGSS covered

Used 12+ times

Phase Change Unit Review Practice Questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The molecules of this substance are moving apart. The phase is

solid

liquid

gas

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The molecules of this substance are moving around each other. The phase is

solid

liquid

gas

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The molecules of this substance are moving in place. The phase is

solid

liquid

gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

the way molecules in a substance move around relative to each other

molecular attraction

freedom of movement

kinetic energy

temperature

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a noticeably different form or state of the same substance

molecule

molecular attraction

phase

scale

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

to provide evidence that goes against a claim

refute

support

reason

explain

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a group of atoms joined together in a particular way

phase

molecular attraction

freedom of movement

molecule

Tags

NGSS.MS-PS1-1

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Phase Change Unit Review Practice Questions

The molecules of this substance are moving apart. The phase is

The molecules of this substance are moving around each other. The phase is

The molecules of this substance are moving in place. The phase is

the way molecules in a substance move around relative to each other

a noticeably different form or state of the same substance

to provide evidence that goes against a claim

a group of atoms joined together in a particular way

the relative size of things

the energy that an object has because its moving

the average kinetic energy of the molecules (a measure of how hot or cold something is)

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