P5 - Energy of Matter

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Created by
Luke Barnett

Cards (14)

  • 2 quantities needed to find density
    Mass and volume
  • What happens to the particles in a substance if its temperature is increased?
    They move faster and the energy in their kinetic energy store increases
  • Changes of state are physical changes because no new substances are produced and the substance will have the same properties as before if the change is reversed
  • The mass of a substance is conserved when it changes state because the number of particles does not change
  • Internal energy of a substance
    The total kinetic energy and potential energy of all the particles in the substance
  • Latent heat
    The energy transferred when a substance changes state
  • Specific latent heat of a substance
    The energy required to change the state of one kilogram of that substance with no change in temperature
  • Specific latent heat of fusion
    The energy required to change one kilogram of the substance from solid to liquid at its melting point without changing its temperature
  • Specific latent heat of vaporisation
    The energy required to change one kilogram of the substance from liquid to vapour at its boiling point, without changing its temperature
  • On a graph of temperature against time for a substance being heated up or cooled down, the flat (horizontal) sections show the time when the substance is changing state and the temperature is not changing
  • Cause of gas pressure on a surface
    The force of the gas particles hitting the surface
  • 2 reasons why the temperature of a gas increases if it is compressed quickly
    The force applied to compress the gas results in work being done to the gas, and the energy gained by the gas is not transferred quickly enough to the surroundings
  • Specific Heat Capacity
    The amount of energy needed to raise the temperature of 1kg of a material by 1°C
  • 2 Reasons why gas pressure in a sealed container increases with temperature.
    The molecules move faster so they hit the surfaces with more force and the number of impacts per second increases, so the total force of the impacts increases