4. A scientist has a container filled with carbon dioxide gas. The particles of this gas are far apart, moving quickly, and bouncing off the container walls. Then the particles slow down and collect at the bottom of the container, such that they are close together and vibrating in a rigid structure.

What caused this change?

A. The container was opened.
B. The temperature decreased.
C. The particles settled over time.
D. The temperature increased.

Question

4. A scientist has a container filled with carbon dioxide gas. The particles of this gas are far apart, moving quickly, and bouncing off the container walls. Then the particles slow down and collect at the bottom of the container, such that they are close together and vibrating in a rigid structure. 

What caused this change?

A. The container was opened.
B. The temperature decreased.
C. The particles settled over time.
D. The temperature increased.

anonymous · Answer

B, this is a phase change. Most likely to a liquid or solid. Which requires that the temperature be decreased.

tcy · Answer

A bunch of kids running around in a room for a while, then they finally sit down, what happen during the proses? What makes them sit down?

anonymous · Answer

Hey, tcy, they got tired and their teacher was yelling at them. Carbon-dioxide molecules don't get sired and they cannot hear teachers yelling.