RP2 - Enthalpy change

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4 Terms

1
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Improving the method

  • Use a polysterene cup or a lid

  • To reduce heat loss

2
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Improving temperature recording

  • Record temperature of water for a suitable time before adding the metal

  • To establish an accurate inital temperature

3
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Improving analysis of results

  • Extrapolate the cooling back to the point of addition

  • To establish a theoretical maximum temperature

4
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Cause for errors

  • Heat loss to or from the surroundings

  • If using a fuel, incomplete combustion

  • Method assumes all solutions have the heat capacity of water