Workers find two substances. One is a toxic chemical. The other is a safe chemical. Both chemicals are liquids at room temperature. As a test, the workers transfer the same amount of energy out of the two containers and find that only the toxic chemical changes phase. How is the toxic chemical different from the safe chemical? The toxic chemical has a . . .

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

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

weaker attraction between its molecules than the safe chemical. Its molecules now move around each other.

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

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.

Detectives find two substances at a crime scene. One is a poison, and the other is a cleaning chemical. At room temperature, both substances are liquids. To test the substances, the detectives transfer the same amount of energy into both substances, but only the cleaning chemical changes phase. How is the cleaning chemical different from the poison? The cleaning chemical has a . . .

weaker 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.

stronger 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 around each other.

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.

Grade 8 Amplify Phase Change 5.0

Authored by English Teacher Trey

Science

8th Grade

NGSS covered

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17 questions

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FILL IN THE BLANK QUESTION

1 min • 1 pt

A _____ keeps its shape because its molecules only move in place, not around each other.

FILL IN THE BLANK QUESTION

1 min • 1 pt

A _____ can flow because its molecules move around, not away from each other.

FILL IN THE BLANK QUESTION

1 min • 1 pt

A _____ does not have a visible shape because its molecules can move away from each other.

Tags

NGSS.MS-PS1-4

FILL IN THE BLANK QUESTION

1 min • 1 pt

A phase change is when the molecules that make up a substance experience a change to their _____. This phase change involves a macroscale change in appearance.

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A change that can be observed at the _ can be explained by a change at the _, which cannot be observed with the naked eye.

molecular scale, macroscale

macaroni scale, molecule scale

macroscale, molecular scale

molehill scale, macroscale

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When energy is transferred to or from a substance, it can change the molecules’ _____.

Friday movie goers

freakish morning star

freedom of movement

friendly morning people

Tags

NGSS.MS-PS1-4

FILL IN THE BLANK QUESTION

1 min • 1 pt

_____ is a measure of the average kinetic energy of the molecules of a substance.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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Grade 8 Amplify Phase Change 5.0

A _____ keeps its shape because its molecules only move in place, not around each other.

A _____ can flow because its molecules move around, not away from each other.

A _____ does not have a visible shape because its molecules can move away from each other.

A phase change is when the molecules that make up a substance experience a change to their _____. This phase change involves a macroscale change in appearance.

A change that can be observed at the _ can be explained by a change at the _, which cannot be observed with the naked eye.

When energy is transferred to or from a substance, it can change the molecules’ _____.

_____ is a measure of the average kinetic energy of the molecules of a substance.

Transferring energy to a substance increases the _ of that substance’s molecules. Transferring energy from a substance decreases the _ of that substance’s molecules.

Whether or not a _____ occurs is determined by the interaction between the kinetic energy of the molecules and the attraction pulling the molecules together.

The _____ of a substance never changes.

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Similar Resources on Wayground

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Discover more resources for Science

Grade 8 Amplify Phase Change 5.0

A _____ keeps its shape because its molecules only move in place, not around each other.

A _____ can flow because its molecules move around, not away from each other.

A _____ does not have a visible shape because its molecules can move away from each other.

A phase change is when the molecules that make up a substance experience a change to their _____. This phase change involves a macroscale change in appearance.

A change that can be observed at the _____ can be explained by a change at the _____, which cannot be observed with the naked eye.

When energy is transferred to or from a substance, it can change the molecules’ _____.

_____ is a measure of the average kinetic energy of the molecules of a substance.

Transferring energy to a substance increases the _____ of that substance’s molecules. Transferring energy from a substance decreases the _____ of that substance’s molecules.

Whether or not a _____ occurs is determined by the interaction between the kinetic energy of the molecules and the attraction pulling the molecules together.

The _____ of a substance never changes.

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Similar Resources on Wayground

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Discover more resources for Science

A change that can be observed at the _ can be explained by a change at the _, which cannot be observed with the naked eye.

Transferring energy to a substance increases the _ of that substance’s molecules. Transferring energy from a substance decreases the _ of that substance’s molecules.