Particle Model and States of Matter Notes

Particle Model of Matter

• Scientific model explaining matter's composition and properties.
  • All matter consists of tiny particles.
  • Particles are always moving, faster when heated.
  • Particles have spaces between them.
  • Particles are attracted to each other; attraction strength varies.

States of Matter

• Atoms exhibit different properties at different temperatures, resulting in three states: solids, liquids, and gases.
• All matter can exist in any of these states based on ambient temperature.
• Particles are in constant motion, known as Brownian Motion.

Solids

• Definite volume and shape (e.g., gold, paperclip, ice).
  • Atoms are closely packed with small spaces.
  • Difficult to compress due to minimal empty space.
  • Particles vibrate around fixed positions.
  • Diffusion is nearly impossible.

Liquids

• Definite volume but no fixed shape.
  • Small spaces between particles, slightly larger than in solids.
  • Not easily compressed.
  • Weaker forces of attraction compared to solids.
  • Particles can move and slide past each other.
  • Diffusion is faster than in solids but slower than in gases.

Gases

• No fixed volume or shape.
  • Large spaces between particles.
  • Easily compressed due to empty space.
  • Almost no forces of attraction between particles.
  • Particles move freely and fill space evenly.
  • Rapid, random movement leads to easy diffusion.