To determine in which box "gas" could be placed in the given table, let's review the options and match each option to the appropriate characteristics of gases:
1. State: We're trying to find the state row that can define the characteristics of a gas.
2. Arrangement of Atoms: For a gas, the atoms or molecules move freely and spread out to fill the container they are in.
3. Examples:
- Helium is mentioned in the table as an example of a state where particles move freely and spread out.
Review of each state in the table:
- Box [tex]$T$[/tex]: "are fixed; vibrate in place," which is characteristic of a solid.
- Box [tex]$U$[/tex]: "move freely; spread out," correctly describes a gas and specifically lists helium, which is a gas.
- Box liquid: "are closely packed; slide past one another," which describes a liquid.
- Box [tex]$V$[/tex]: "have rapidly moving ionized particles," which typically describes a plasma state.
From this information, the correct box where “gas” should be placed is [tex]$U$[/tex].
