Final answer:
Medium A is the solid, Medium B is the liquid, and Medium C is the gas. Solids have a definite shape and volume, liquids have a definite volume but adapt to the shape of their container, and gases neither have a definite shape nor volume. Molecules can change positions in the liquid, gas, and plasma phases.
Step-by-step explanation:
The student has been given several statements and must determine which phase of matter (solid, liquid, or gas) each medium represents. We know that solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases expand to fill their container and do not have a definite volume or shape. With this in mind:
- Solution a: This statement that describes the liquid state is likely Medium B, which implies a definite volume and taking the shape of the container.
- Solution b: This statement that describes the gas state is likely Medium C, which suggests expansion to fill the container, indicating neither definite volume nor shape.
- Solution c: This statement also describes the liquid state and again likely refers to Medium B based on the descriptions.
Therefore, Medium A must be the solid because it is the only phase left that matches the properties described in the solutions and the referenced educational figures provided (fixed shape and volume).
To answer question 14, in which phases of matter are molecules capable of changing their positions, the correct answer is c. liquid, gas, plasma, as these are the states where molecules have the freedom to move around, unlike in a solid where they are held in a fixed structure.