Particle Model of Matter

• Density= mass/volume
• Density of an object depends on what it is made of and how particles are arranged
• Solids have strong forces of attraction between particles, so they have a fixed shape and volume and have very little energy
• Liquids have weaker forces of attraction between particles and form irregular arrangements. They move in random directions at low speeds and are generally less dense than solids
• Gases have almost no forces of attraction between the particles, so they can move freely in all directions at high speeds and have low densities
• A Eureka or Displacement can is used to find the volume of irregular objects
• Internal Energy is the energy stored by the particles making up a system
• A change of state conserves mass
• Solid to Liquid:Melting
• Solid to Gas:Sublimating
• Liquid to Solid:Freezing
• Liquid to Gas:Evaporation
• Gas to Liquid:Condensing
• Change of State is a physical Change