particle model

• what is the equation for density?

  p= m/v
• what are the units for density, mass and volume?

  density-kg/m3, mass-kg, volume-m3
• how are the particles in a solid arranged?

  the particles touch and vibrate around a fixed pattern
• how are particles in a liquid arranged?

  touching not in fixed positions, free to flow around
• how are particles in a gas arranged?

  far apart and mover around quickly and randomly
• which state of matter is most dense?

  solid
• what are the names of the 5 state changes?

  melting, evaporating, freezing, condensing, sublimating
• how do you measure the volume of a regular solid?

  Length x Width x Height
• how do you measure a irregular solid?

  place the irregular solid in water in a measuring cylinder. measure how much the water level has gone up by
• what is internal energy?

  The total energy of a system, including both its kinetic and potential energy.
• what is the definition of specific heat capacity?

  energy needed to heat up 1kg of a material by a temperature of 1 degree c
• what is the definition of latent heat?

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

  the energy goes into making and breaking bonds
• how do gas molecules move?

  Randomly
• what happens to the speed of particles in a gas as the gas is heated?

  speed increase
• what happens to pressure if the size of a container is reduced?

  pressure increases as the particles hit the walls of container more
• the specific latent heat of fusion gives what change of state?

  solid to liquid
• the specific latent heat of vaporisation gives what state change?

  liquid to gas
• which equation to calculate energy change from specific heat capacity?


  ДЕ = m x c × Д0
• what is the equation to calculate energy needed for a state change?

  E = mx L