Educational worksheet for students to determine the truth of statements about dissolving substances.

Problem Description:

The task involves evaluating statements about dissolving substances and determining whether each statement is True or False. The goal is to analyze each statement based on scientific principles related to solubility and dissolution.

Solution:

#### Statement 1: "Dissolved substances cannot be seen because they become part of the water."
- Analysis: When a substance dissolves, its particles (molecules or ions) are dispersed throughout the solvent (water). However, this does not necessarily mean that the dissolved substance cannot be seen. For example, colored solutions (like blue dye in water) can still be visible. Additionally, some dissolved substances may scatter light, making them visible.
- Answer: False

#### Statement 2: "Substances which do not dissolve are called soluble."
- Analysis: Substances that do not dissolve are called insoluble, not soluble. Soluble refers to substances that can dissolve in a solvent.
- Answer: False

#### Statement 3: "Only white powder dissolves."
- Analysis: Dissolution is not dependent on the color or physical state of the substance. Many solids, liquids, and gases can dissolve in solvents, regardless of their color. For example, sugar (white powder) dissolves, but so do substances like salt (which is also a white powder), vinegar (a liquid), and carbon dioxide gas.
- Answer: False

#### Statement 4: "Some solids dissolve."
- Analysis: This statement is true. Many solids are capable of dissolving in solvents. For example, sugar, salt, and caffeine are all solids that dissolve in water.
- Answer: True

#### Statement 5: "All materials dissolve."
- Analysis: This statement is false. Not all materials dissolve. Many substances are insoluble in certain solvents. For example, oil does not dissolve in water, and sand does not dissolve in any common solvent.
- Answer: False

#### Statement 6: "Dissolved substances are called soluble."
- Analysis: This statement is true. Substances that can dissolve in a solvent are referred to as soluble.
- Answer: True

Final Answer:

\[
\boxed{
\begin{array}{|l|c|}
\hline
\text{Statement} & \text{True/False} \\
\hline
\text{Dissolved substances cannot be seen because they become part of the water.} & \text{False} \\
\text{Substances which do not dissolve are called soluble.} & \text{False} \\
\text{Only white powder dissolves.} & \text{False} \\
\text{Some solids dissolve.} & \text{True} \\
\text{All materials dissolve.} & \text{False} \\
\text{Dissolved substances are called soluble.} & \text{True} \\
\hline
\end{array}
}
\]