Question

which of the following is accurate about gases?
a. gases are not fluid
b. gas has a fixed volume that will not change with temperature adjustments
c. a gas must be contained in a closed container or it will escape into the atmosphere
d. molecules of gases have a lower energy level than solids or liquids.

Explanation:

• Option A is wrong: Gases are fluids, as they can flow and take the shape of their container.
• Option B is wrong: Gas volume changes with temperature (per Charles's Law: $V \propto T$ at constant pressure).
• Option D is wrong: Gas molecules have the highest energy level among the three states of matter, as they move freely and rapidly.
• Option C is correct: Gases have no fixed volume and their molecules spread out, so they will disperse into the atmosphere without a closed container.

Answer:

C. A gas must be contained in a closed container or it will escape into the atmosphere