Particle model of Matter

• Draw arrangement of particles in a solid

  
• Draw the arrangement of particles in liquid

  
• Draw the arrangement of particles in a gas

  
• What is the equation linking density, mass and volume?

  Density = mass ÷ volume
• What are the units for density?

  kg/m3
• What are units the mass?

  kg or kilogram
• What are the units for volume?

  m3
• why is change of state a physical change and not a chemical change?

  in a physical change the material recovers its original properties if the change is reversed
• What is internal energy?

  Energy that is stored inside a system by the particles (atoms and molecules) that make up the system. It is the total kinetic energy and potential energy of all the particles (atoms and molecules)
• What does heating a system do to its internal energy?

  "it increases the energy stored within the system by increasing the energy of the particles that make up the system. This either raises the energy of the particles that make up the system. This either raises the temperature of the system or produces a change of state"
• What is specific heat capacity?

  The specific heat capacity of a substance is the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius
• What is the equation linking energy change, mass, specific heat capacity and change in temperature?

  change in thermal energy = mass × specic heat capacity × temperature change
• What are the units for energy change?

  J or joules
• What are the units for specific heat capacity?

  J/kg °C
• What are the units for temperature change?

  °C
• What are the units of mass?

  kg or kilogram
• What symbol is temperature change represented by?

  ∆θ
• What is equation linking energy, mass and specific latent heat?

  energy for a change of state = mass × specic latent heat
• What are the units for specific latent heat?

  J/kg
• What is Specific latent heat of fusion?

  change of state from solid to liquid
• What happens to the pressure of a gas if you decrease the temperature of the gas at constant volume?

  the pressure decreases
• What is Specific latent heat of vaporisation?


  change of state from liquid to gas
• What is specific latent heat?


  The specific latent heat of a substance is the amount of energy required to change the state of one kilogram of the substance without a change in temperature