in which state of matter are particles packed tightly together in fixed positions? A. Gas C. liquid D. compound
The correct answer and explanation is:
The correct answer is B. Solid.
In a solid state of matter, particles are packed tightly together in fixed positions. This close packing means the particles cannot move freely but only vibrate slightly around their fixed spots. Because of this arrangement, solids have a definite shape and volume. The particles in a solid are held together by strong intermolecular forces, which keep them locked in place, preventing them from flowing or changing shape easily.
In contrast, gases have particles that are far apart and move freely in all directions. This allows gases to fill any container and take both its shape and volume. Liquids have particles that are close together but not fixed; they can move past one another, allowing liquids to flow and take the shape of their container while maintaining a constant volume.
The option “D. compound” is not a state of matter but refers to a substance made of two or more elements chemically bonded together. Compounds can exist in any state of matter—solid, liquid, or gas—depending on conditions like temperature and pressure.
The tightly packed particles in solids give them unique characteristics such as rigidity and incompressibility. This structure makes solids maintain their shape under normal conditions and resist deformation. Examples of solids include ice, wood, and metals.
In summary, solids are characterized by particles arranged in a fixed, tightly packed structure, which distinguishes them from liquids and gases. This arrangement leads to solids having a definite shape and volume.