p3 - particle model of matter

• solids

  particles are very close together

  particles arranged in regular pattern

  particles vibrate but do not move from place to place

  has very high density - bc particles are packed closely together, solids have lots of mass for their volume
• liquids

  particles are close together

  particles are not arranged in regular pattern

  particles can move around each other

  usually have a high density - bc particles are close together, liquids have a lot of mass for their volume
• gases

  particles are very far apart

  particles not arranged in any pattern

  particles are moving very rapidly

  gases have a low density - bc particles are very far apart so gases only have a small mass for their volume
• define density

  density of material tells us the mass for a given volume
• equation for density

  p (kg/m^3) = mass (kg)/ volume (m^3)
• how to determine the density of a regular object

  determine the mass using a balance

  measure (ruler) the length of the side

  volume equals the length of side cubed

  put values into density equation
• determine density of irregular object

  determine the mass using balance

  fill Eureka can with water

  place object in the water, water will then be displaced and flow out eureka can's spout.

  measure the volume of the water displaced, volume is the same as the volume of the object (test tube)

  put values into density equation
• define internal energy

  the energy stored in system by the particles