Phase Change: Level 1

A student left a sealed jar of water in her freezer. When she returned twelve hours later, the water had changed phase and was a solid. What happened to the water molecules?

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

A scientist has a container with a substance inside. What change did the scientist observe in the substance?

• Before, the substance was a gas. Later, it was a liquid.
• Before, the substance was a liquid. Later, it was a solid.
• Before, the substance was a liquid. Later, it was a gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Phase change from a gas to a liquid.

• condensation
• evaporation
• melting
• freezing

Tags

NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS1-4

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 . . .

• faster, and the ingredient will be a solid.

• faster, and the ingredient will be a liquid.

• slower, and the ingredient will be a solid.

• slower, and the ingredient will be a liquid.

Tags

NGSS.MS-PS1-4

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?

• At first, the water was a gas. Later, it was a liquid.

• At first, the water was a liquid. Later, it was a solid.

• At first, the water was a solid. Later, it was a liquid.

• At first, the water was a liquid. Later, it was a gas.

Tags

NGSS.MS-PS1-4

Describe the attraction level of a solid

• High

• Medium

• Low

Tags

NGSS.MS-PS1-4

Describe the attraction level of a gas

• High

• Medium

• Low

You have dropped your popsicle and are watching it become a LIQUID. Which answer BEST explains what PHASE CHANGE has occurred AND how the molecule MOVEMENT has changed?

• The PHASE CHANGE that has occurred is CONDENSATION and the molecule MOVEMENT has become FASTER.

• The PHASE CHANGE that has occurred is EVAPORATION and the molecule MOVEMENT has become SLOWER.

• The PHASE CHANGE that has occurred is MELTNG and the molecule MOVEMENT has become FASTER.

Tags

NGSS.MS-PS1-4

You measure the temperature of your pool in the morning before school. It is 20 degrees Celsius. When you get home from school you measure the temperature and it is higher than the morning. What happened to the water molecules while you were at school?

• The molecules got closer together.

• The molecules started moving faster.

• The water molecules became larger.

• The water lost cold molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5