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    hi
    basically was doing a paper for unit1 chem nuffiled.....
    suggest one reason why it is difficult to measure enthalpy change of reaction directly by experiment:?
    gives us the thermal decomposition of CaC03
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    because heat energy is lost to the surroundings???
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    yeah i was confused.....i was thinking of what you said or the fact that there may be incomplete combustion?
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    (Original post by El-Taji)
    hi
    basically was doing a paper for unit1 chem nuffiled.....
    suggest one reason why it is difficult to measure enthalpy change of reaction directly by experiment:?
    gives us the thermal decomposition of CaC03
    Because experimental errors are inevitable, like someone mentioned above, heat loss, systematic errors(accuracy/reliability of your equipments). probably also that difficult to maintain the pressure, pressure could vary with temperature.
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    yup ^ ^ id listen to the guy above
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    ah kl one more question this is toittaly off topic but dont want to start anither thread,,,,,
    could a branched alcohopl be pentanol or does it have to have branches like a secondary alcohol e.g.l pentan-2-ol??
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    isnt pentan-2-ol one with a double bond? if it was branched wouldnt it be a methyl group attatched to it, so methyl becomes the prefix.

    Again, i did this stuff ages ago, so forgotten alot of it, get a second opinion.
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    (Original post by El-Taji)
    ah kl one more question this is toittaly off topic but dont want to start anither thread,,,,,
    could a branched alcohopl be pentanol or does it have to have branches like a secondary alcohol e.g.l pentan-2-ol??
    No, what you have described is a secondary alcohol. A branched alcohol has a branch in the carbon chain eg 2-methyl pentan-1-ol
 
 
 
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