Which statement best describes the properties of a solid?

Which statement best describes the properties of a solid?

• A. Density: high; Arrangement of particles: regular pattern; Movement: vibrate around a fixed position; Energy: low
• B. Density: low; Arrangement of particles: irregular pattern; Movement: move quickly in all directions; Energy: greatest
• C. Density: medium; Arrangement of particles: randomly arranged; Movement: move around each other; Energy: greater
• D. Density: medium; Arrangement of particles: regular pattern; Movement: stay in a fixed position; Energy: medium

Answer: (A)

In a solid, particles are packed tightly in a regular arrangement and can only vibrate about fixed positions. The strong forces holding them in place keep their motion limited, so their kinetic energy is low compared with liquids and gases. This combination gives solids a definite shape and volume and a high density in general. The statement that describes high density, a regular arrangement, vibrations around fixed positions, and low energy captures these characteristics most accurately. Descriptions that imply lots of movement, irregular packing, or high energy align more with liquids or gases, not solids.

In a solid, particles are packed tightly in a regular arrangement and can only vibrate about fixed positions. The strong forces holding them in place keep their motion limited, so their kinetic energy is low compared with liquids and gases. This combination gives solids a definite shape and volume and a high density in general. The statement that describes high density, a regular arrangement, vibrations around fixed positions, and low energy captures these characteristics most accurately. Descriptions that imply lots of movement, irregular packing, or high energy align more with liquids or gases, not solids.