Amplify Phase Change Unit Review

A cook had a jar containing a sweet food and a jar containing a sour food. The image above shows the sweet and sour foods. At room temperature, both foods are liquids. The same amount of energy was transferred into both substances. Later, one of the foods had changed phase while the other had not. Which food changed phase, and how did it change?

• The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.

• The sweet food changed because the strong attraction between molecules made their movement slower. Its molecules now move around each other.

• The sour food changed because the weak attraction between molecules let them move faster. Its molecules now move away from each other.

• The sour food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move in place.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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

• Before the student left, the molecules were moving in place. After, the molecules were moving around each other.

• Before the student left, the molecules were moving around each other. After, the molecules were moving away from each other.

• Before the student left, the molecules were moving around each other. After, the molecules were moving in place.

• Before the student left, the molecules were moving away from each other. After, the molecules were moving around each other.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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

The diagram describes the movement of molecules in a substance used to make fuel. What change did the fuel scientist observe in the substance?

• Before the process, the substance was a solid. After the process, it was a liquid.

• Before the process, the substance was a gas. After the process, it was a liquid.

• Before the process, the substance was a liquid. After the process, it was a solid.

• Before the process, the substance was a liquid. After the process, it was a gas.

  Before the process, the substance was a liquid. After the process, it was a gas.

Tags

NGSS.MS-PS1-4

Scientists digging in a cave found an unknown substance. The scientists found that the substance’s molecules were moving around each other. The scientists increased the speed of the substance’s molecules and caused a phase change. How did the scientists do this, and how did this affect the substance?

• into the substance, and the substance changed into a gas

• into the substance, and the substance changed into a liquid.

• out of the substance, and the substance changed into a solid.

• out of the substance, and the substance changed into a liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The medicine in the diagram above has molecules that are moving around each other. The doctor needs to slow down the molecules enough to cause a phase change. How will she do this, and how will this affect the medicine?

She transfers energy . . .

• into the medicine until it is a liquid.

• into the medicine until it is a gas.

• out of the medicine until it is a solid.

• out of the medicine until it is a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Divers found two substances on the bottom of the ocean. At room temperature, both substances are liquid. Scientists then transferred the same amount of energy out of both substances. When a scientist checked again, Substance 1 had changed phase, but Substance 2 had not. How are Substances 1 and 2 different?

• weaker attraction between its molecules than Substance 2. Its molecules now move in place.

• weaker attraction between its molecules than Substance 2. Its molecules now move around each other.

• stronger attraction between its molecules than Substance 2. Its molecules now move away from each other.

• stronger attraction between its molecules than Substance 2. Its molecules now move in place.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS1-2

A noticeably different form or state of the same substance

• Mixture

• Phase

• Mass

• Density

Tags

NGSS.MS-PS1-4

If you have a liquid that changes to a gas, explain it's freedom of movement in both phases.

• molecules move away from each other, then around each other

• molecules move in place, then around each other

• molecules move around each other, then away from each other

• molecules move around each other, then in place

Tags

NGSS.MS-PS1-4

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

• Kinetic Energy

• Molecule

• Phase

• Freedom of Movement

Tags

NGSS.MS-PS1-4