Particle theory and states of matter

• Density= mass / volume
• In a gas, the particles move in random directions at high speeds.
• In a gas, the particles have lots of energy in their kinetic energy stores and they are free to move. 
• In a gas, there are almost no forces of attraction between particles.
• In a liquid, the particles move in random directions at low speeds.
• In a liquid, the particles are close together but can move past each other.
• In a liquid, forces of attraction are weaker than a solid.
• In a solid, the particles vibrate around fixed positions.
• In a solid, the particles don't have much energy in their kinetic energy store.
• In a solid, strong forces of attraction hold the particles together.
• Change of state is a physical change, where it is reversible.
• The particles of a substance in each state are the same, only the arrangement and energy of the particles are different.
• According to particle theory everything is made of tiny little balls.
• Density of a substance varies with a state but mass doesn't.
• The particle theory is a way of explaining matter.
• What is this state?

  Solid

  
• What is this state?

  Liquid

  
• What is this state?

  Gas

  
• Solid - liquid?

  Melting
• Liquid - gas?

  Evaporation
• Gas - liquid?

  Condensation
• Liquid - solid?

  Freezing
• Solid - gas?

  Sublimation
• Gas - solid?

  Deposition