Particle model of matter

• What is the equation to work out the density of an object?

  $density\ p\ =$$\frac{mass\ m}{volume\ v\ }$
• Describe the particle model of matter for SOLIDS

  • particles are very close together
  • arranged in a regular pattern
  • particles vibrate in a fixed position
• Describe the particle model of matter for LIQUIDS

  • particles are close together
  • not arranged in a regular pattern
  • able to move around each other
• Describe the particle model of matter for SOLIDS

  • particles are very far apart
  • arranged in an irregular pattern
  • moving very rapidly
• Describe the density of a SOLID

  Very high density because the particles are packed closely together. Solids have a lot of mass for their volume
• Describe the density of a LIQUID

  High density because the particles are close together. Have a lot of mass for volume
• Describe the density of a GAS

  Low density as particles are very far apart. Have a small mass for their volume
• How do you measure the density of a regular object?

  1. determine the mass using a balance
  2. to measure volume measure height, length and width
  3. use the equation to work out
• How do you measure the density of an irregular object?

  1. find the mass of the object using a balance
  2. fill a Eureka can with water
  3. place the object in the can and measure the water displaced using a measuring cylinder = volume
  4. use equation
• Changes of state are physical changes because...

  the material recovers its original properties of the change is reversed
• What is the INTERNAL ENERGY?

  the total kinetic and potential energy of all the particles that make up a system
• Heating changes the energy stored within the system by ...

  Increasing the energy of the particles that make up a system
• The increase in temperature of an object depends on...

  • the mass
  • the type of material
  • the energy input