Phase Change Quiz 7th B

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Test your knowledge of phase changes and latent heat.

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Stephanie Richardson

Estados Unidos

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Phase Change Quiz 7th B


Phase Change Quiz 7th BVersión en línea Test your knowledge of phase changes and latent heat. por Stephanie Richardson 1 What phase change occurs when a solid becomes a liquid? a Freezing b Vaporization c Melting d Sublimation 2 Which phase change occurs when ice turns directly into water vapor? a Freezing b Deposition c Sublimation d Condensation 3 What phase change occurs when water vapor becomes liquid water? a Freezing b Sublimation c Condensation d Vaporization 4 Which process is the reverse of condensation? a Freezing b Deposition c Vaporization d Melting 5 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? a Before the mechanic left, the molecules were moving away from each other. When she returned, they were moving around each other. b Before the mechanic left, the molecules were moving around each other. When she returned, they were moving in place. c Before the mechanic left, the molecules were moving around each other. When she returned, they were moving away from each other. d Before the mechanic left, the molecules were moving in place. When she returned, they were moving around each other. 6 A chef finds a sealed container consisting of an ingredient that goes into his restaurant’s secret sauce. The ingredient’s molecules are moving in place. What will happen if the chef causes the ingredient to change phase by transferring energy into it? After the phase change, the ingredient’s molecules will move . . . a faster, and the ingredient will be a solid. b faster, and the ingredient will be a liquid. c slower, and the ingredient will be a solid. d slower, and the ingredient will be a liquid. 7 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 . . . a weaker attraction between its molecules than the safe chemical. Its molecules now move in place. b weaker attraction between its molecules than the safe chemical. Its molecules now move around each other c stronger attraction between its molecules than the safe chemical. Its molecules now move away from each other d stronger attraction between its molecules than the safe chemical. Its molecules now move in place 8 Cesar and Ming were investigating a see-through container of water. Water can be a solid, liquid, or gas. At first, Cesar and Ming said the water molecules were moving in place. Later, the water molecules were moving around each other. What change did they observe to the water? a At first, the water was a gas. Later, it was a liquid. b At first, the water was a liquid. Later, it was a solid c At first, the water was a solid. Later, it was a liquid. d At first, the water was a liquid. Later, it was a gas. 9 A company uses a substance that is a solid under normal conditions. This substance will be used in extreme conditions, which could make the substance’s molecules move faster and cause a phase change. How would this phase change occur, and how would the molecules of the substance be affected under these extreme conditions? Energy would be transferred . . . a out of the substance, and its molecules would move away from each other b out of the substance, and its molecules would move around each other c into the substance, and its molecules would move around each other. d into the substance, and its molecules would move in place 10 The are two different substances in sealed containers. Substance A has a weaker molecular attraction and substance B has a stronger molecular attraction. 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? a 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. b Substance A changed phase because the weak attraction between its molecules allowed them to move faster. Its molecules now move away from each other c 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. d 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. 11 A student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar outside, the water was liquid. Twelve hours later, the water had changed phase and was a gas. What happened to the water molecules? a When the student left the jar outside, the molecules were moving around each other. Later, the molecules were moving in place. b When the student left the jar outside, the molecules were moving away from each other. Later, the molecules were moving around each other. c When the student left the jar outside, the molecules were moving in place. Later, the molecules were moving around each other. d When the student left the jar outside, the molecules were moving around each other. Later, the molecules were moving away from each other. 12 Refrigerators are able to transfer energy out of a substance. At first, the substance is a gas. The refrigerator changes the phase of the substance by transferring energy out of it. How does this change affect the substance’s molecules? After the phase change, the molecules move . . . a slower, and they move away from each other b slower, and they move around each other c faster, and they move around each other. d faster, and they move in place. 13 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 . . . a weaker attraction between its molecules than the poison. Its molecules now move in place b weaker attraction between its molecules than the poison. Its molecules now move away from each other c stronger attraction between its molecules than the poison. Its molecules now move away from each other. d stronger attraction between its molecules than the poison. Its molecules now move away from each other. 14 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? a At first, the water was a gas. After, it was a liquid. b At first, the water was a solid. After, it was a liquid. c At first, the water was a liquid. After, it was a gas. d At first, the water was a liquid. After, it was a solid. 15 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 above. 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 . . . a into the substance, and the molecules moved around each other b into the substance, and the molecules moved away from each other. c out of the substance, and the molecules moved around each other. d out of the substance, and the molecules moved in place. 16 Two different cars, the Model S which has a weaker molecular attraction and Model T which has a stronger molecular attraction, use different substances in their engines . 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? a 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. b The Model T’s substance changed phase because the strong attraction between the molecules made their movement slower. Its molecules now move in place. c 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 d 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.

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Phase Change Quiz 7th BVersión en línea

por Stephanie Richardson

What phase change occurs when a solid becomes a liquid?

Which phase change occurs when ice turns directly into water vapor?

What phase change occurs when water vapor becomes liquid water?

Which process is the reverse of condensation?

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?

Cesar and Ming were investigating a see-through container of water. Water can be a solid, liquid, or gas. At first, Cesar and Ming said the water molecules were moving in place. Later, the water molecules were moving around each other. What change did they observe to the water?

A student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar outside, the water was liquid. Twelve hours later, the water had changed phase and was a gas. What happened to the water molecules?

Refrigerators are able to transfer energy out of a substance. At first, the substance is a gas. The refrigerator changes the phase of the substance by transferring energy out of it. How does this change affect the substance’s molecules? After the phase change, the molecules move . . .

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?