calorimetry

• what is calorimetry?

  determines enthalpy changes by measuring heat energy given out or taken in

  usually by measuring temperature change of reaction solution or water
• how to perform calorimetry with reactions in solution?

  1. put reactant solution in polystyrene beaker
  2. measure temperature at regular intervals
  3. add other reactant
  4. measure temperature at regular intervals
• how to perform calorimetry in combustion reactions?

  use heat produced in combustion reaction to heat known volume of water to measure temperature change of water at regular intervals
• what is the heat energy calculation symbols?

  q - heat energy (J)

  m - mass of solution (g or cm3)

  C - specific heat capacity (always 4.18Jg-1K-1)

  t - temperature change (K or C)
• what is the heat energy calculation?

  q = mCt
• why would the enthalpy change calculated be different to the data book value?

  1. heat loss to environment
  2. heat lost to equipment
  3. equipment has different heat capacity
• what is the enthalpy change calculation symbols?

  H -enthalpy change

  q - heat energy

  n - moles
• what is the enthalpy change calculation?

  H = q/n