Phase Change CJA

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

• Kinetic Energy

• Molecule

• Phase

• Freedom of Movement

Tags

NGSS.MS-PS1-4

The energy that an object has because it is moving

• Molecule

• Refute

• Density

• Kinetic Energy

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

A pull between two molecules that is always the same for a substance

• Kinetic Energy

• Molecular Attraction

• Molecule

• Mixture

Tags

NGSS.MS-PS1-1

A noticeably different form or state of the same substance

• Mixture

• Phase

• Mass

• Density

Tags

NGSS.MS-PS1-4

To provide evidence that goes against a claim

• Mixture

• Refute

• Claim

• Sclae

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 out of 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 in place.

• 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

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 liquid. Twelve hours later, the water had changed phase and was a soldi. 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-PS3-5

Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving in place. 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

What happens to molecules when their kinetic energy decreases?

• They move slower.

• They move faster.

• They get heavier.

• It depends on the type of molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Jose's go cart is made of steel. When are the steel molecules in his bicycle moving?

The aluminum molecules are . . .

• only moving when Jamil is riding his bicycle.

• only moving when Jamil is not riding his bicycle.

• always moving.

• never moving.