Particle model

• What is sublimation?

  Change from solid to gas
• Why do particles change state?

  Due to energy transfer
• What is the opposite of sublimation?

  Deposition
• What happens to particles during condensation?

  Particles come close together
• What happens to particles during boiling/evaporation?

  Particles gain energy and move faster
• What happens to particles during freezing?

  Particles take a fixed place in a pattern
• What happens to particles during melting?

  Particles vibrate on the spot
• Can a solid be compressed?

  No, because particles are touching
• What is a foam?

  Pockets of gas surrounded by liquid or solid
• Can a liquid flow?

  Yes, because particles can slide over each other
• What is the definition of a substance?

  Has one type of material
• What is an aerosol?

  Tiny pieces of solid or liquid suspended in a gas
• What are the limitations of the particle model?

  Particles are not solid and have different shapes
• What is endothermic?

  Energy is transferred from surroundings to substance
• What is exothermic?

  Energy is transferred from substance to surroundings
• What is Brownian motion?

  Motion of tiny pieces of solid suspended in a liquid or gas
• What are the different states of matter?

  • Solid: particles are touching and have a fixed position
  • Liquid: particles are touching but can slide over each other
  • Gas: particles are far apart and can move freely
• What are the changes of state?

  • Melting: solid to liquid
  • Boiling/evaporation: liquid to gas
  • Condensation: gas to liquid
  • Freezing: liquid to solid
  • Sublimation: solid to gas
  • Deposition: gas to solid
• What are the key terms in the particle model?

  • Substance: has one type of material
  • Foam: pockets of gas surrounded by liquid or solid
  • Aerosol: tiny pieces of solid or liquid suspended in a gas
  • Sublimation: change from solid to gas
  • Deposition: change from gas to solid
  • Endothermic: energy is transferred from surroundings to substance
  • Exothermic: energy is transferred from substance to surroundings
  • Model: an idea that explains observations and helps make predictions
• What is a model?

  An idea that explains observations and helps make predictions
• What is the evidence for the particle model?

  Brownian motion and dissolving
• Why is the particle model important?

  • Helps explain the behavior of substances
  • Helps predict the behavior of substances
  • Provides a framework for understanding the properties of substances