states of mater

• the three states of matter are solids, liquids and gases
• this is a solid

  
• This is a Liquid

  
• this is a gas

  
• states can be represented by simple models, particles are represented by small solid spheres
• Gas particles have the most energy
• gas particles are the most spread apart
• gas particles have a random arrangement
• Liquid particles have more energy than those in a solid, but less than those in a gas
• liquid particles are somewhat close together but not as close as solids
• liquids have a random arrangement
• solids have the least amount of energy
• solid particles are not moving/are just vibrating
• solids are arranged regularly and very closely together
• Physical changes involves the forces between the particles of the substances
• solid → liquid: melting
• liquid → solid: freezing
• melting and freezing take place at the melting point
• Boiling and condensing take place at the boiling point
• • liquid → gas: boiling
• • gas → liquid: condensing