P3

• What are the units for density


  $kg/m^3$
• What are the units for mass

  kg
• What are the units for volume

  $m^3$
• How are particles in a solid arranged

  The particles are touching and vibrate around a fixed pattern
• How are particles in a liquid arranged


  Particles are touching but not in fixed positions

  Free to move around
• How are particles in a gas arranged

  Particles are spaced out and move around randomly and quickly
• How are changes in state different to chemical changes

  The material recovers its original properties if the change is reversed
• Which state of matter is most dense

  Solid
• What are the names of the five state changes

  Melting

  Evaporation

  Freezing

  Condensation

  Sublimation
• How do you measure the volume of a regular solid

  Measure the length of the three sides and multiply together
• How do you measure volume of an irregular solid

  Place the irregular solid in water

  Measure volume of displaced water
• What is internal energy

  The total kinetic energy and potential energy of all the particles that make up a system
• What is the definition of specific heat capacity

  The energy needed to heat up 1kg of a material by 1°C
• What is the definition of latent heat

  The energy needed to change state of 1 kg of a substance without changing temperature
• Why doesn't the temperature of a material change as it's changing state?

  Energy goes into breaking/making bonds
• How do the molecules in a gas move


  In random motion
• What happens to the speed of particles in a gas as the gas is heated

  The speed of particles increases as the gas is heated
• What happens to pressure if the size of the container is reduced

  Pressure increases
• The specific latent heat of fusion gives what state change?

  Solid to Liquid
• The specific latent heat of vaporisation gives what state change?

  From Liquid to Gas