Educational worksheet for students to classify properties of matter into solids, liquids, and gases.

Problem Description:

The task is to categorize the given words into three groups: Solids, Liquids, and Gases. The words provided are:

- Solids: invisible, steam, air, definite shape, no fixed shape, hard, wet, gooey, rough, keeps its shape, can't feel it, can melt
- Liquids: (to be filled)
- Gases: (to be filled)

Solution Approach:

To solve this problem, we need to understand the properties of solids, liquids, and gases:

1. Solids:
- Have a definite shape.
- Have a fixed volume.
- Are rigid and do not flow.
- Can be hard or soft.
- Can have a rough or smooth texture.

2. Liquids:
- Do not have a definite shape but take the shape of their container.
- Have a fixed volume.
- Can flow.
- Can be wet or gooey.
- Can have a smooth texture.

3. Gases:
- Do not have a definite shape.
- Do not have a fixed volume.
- Expand to fill any container.
- Are invisible.
- Can be felt as air.
- Can be described as "can't feel it" because they lack a tangible form.

Step-by-Step Categorization:

#### Solids:
- Definite shape: Solids maintain a fixed shape.
- Hard: Solids can be hard.
- Rough: Solids can have a rough texture.
- Keeps its shape: Solids retain their shape.
- Can melt: Solids can change state by melting.

#### Liquids:
- No fixed shape: Liquids adapt to the shape of their container.
- Wet: Liquids can be wet.
- Gooey: Liquids can have a viscous consistency.
- Smooth: Liquids often have a smooth texture.

#### Gases:
- Invisible: Gases are typically invisible.
- Steam: Steam is a gas (water vapor).
- Air: Air is a mixture of gases.
- Can't feel it: Gases lack a tangible form.
- Can melt: This does not apply to gases, as they do not melt; they condense.

Final Categorization:

#### Solids:
- definite shape
- hard
- rough
- keeps its shape
- can melt

#### Liquids:
- no fixed shape
- wet
- gooey
- smooth

#### Gases:
- invisible
- steam
- air
- can't feel it

Final Answer:

\[
\boxed{
\begin{array}{l}
\textbf{Solids:} \text{ definite shape, hard, rough, keeps its shape, can melt} \\
\textbf{Liquids:} \text{ no fixed shape, wet, gooey, smooth} \\
\textbf{Gases:} \text{ invisible, steam, air, can't feel it}
\end{array}
}
\]