Question

Another phase that atoms can be in is a gas phase. The air inside this hot air balloon is an example of matter in the gas phase. There are atoms of different kinds, like hydrogen, helium, oxygen, nitrogen, and carbon in the hot air balloon.

Look at the image. What is the best description of how the atoms are arranged in a gas phase?


A.
The atoms are closer together and moving more slowly.

B.
The atoms are closer together and moving more quickly.

C.
The atoms are farther apart and moving more slowly.

D.
The atoms are farther apart and moving more quickly.

Answer 1

D. The atoms are farther apart and moving more quickly. In a gas the particles are spread out with large spaces between them and have higher speeds (higher kinetic energy) than in solids or liquids.