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    (Original post by Splaffie)
    this is exactly what i wrote and im 99% sure it was what they were looking for
    In June 2015 it says:
    "heat loss or not all heat transferred to the apparatus or heat absorbed by the apparatus or (specific) heat capacity of the apparatus not considered
    • incomplete combustion / not completely burned / reaction is not complete
    • The idea that the water may end up in the gaseous state (rather than liquid) • reactants and/or products may not be in standard states. (Ignore this one as it was not asking for standard enthalpy) "
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    (Original post by DaVinciGirl)
    In June 2015 it says:
    "heat loss or not all heat transferred to the apparatus or heat absorbed by the apparatus or (specific) heat capacity of the apparatus not considered
    • incomplete combustion / not completely burned / reaction is not complete
    • The idea that the water may end up in the gaseous state (rather than liquid) • reactants and/or products may not be in standard states. (Ignore this one as it was not asking for standard enthalpy) "
    this year i noticed a focused on average bond enthalpy with these types of questions, ESPECIALLY data book values, it also said to ignore heat loss or incomplete combustion
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    (Original post by DaVinciGirl)
    In June 2015 it says:
    "heat loss or not all heat transferred to the apparatus or heat absorbed by the apparatus or (specific) heat capacity of the apparatus not considered
    • incomplete combustion / not completely burned / reaction is not complete
    • The idea that the water may end up in the gaseous state (rather than liquid) • reactants and/or products may not be in standard states. (Ignore this one as it was not asking for standard enthalpy) "
    My teacher mentioned an alternative point that multiple different experiments would have been conducted to obtain an average for data book values but this was one individual experiment?
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    (Original post by Splaffie)
    it specifically said to not write about heat loss
    No, im 100% sure mine said without incomplete combustion or heat transferred to the atmosphere
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    My book makes 4 points:
    1.) heat absorbed by container
    2.) heat transferred to the surroundings
    3.) incomplete combustion
    4.) flammable liquid escaping by evaporation
    So there are two options to choose from
    (This is from the CGP complete course)
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    (Original post by Splaffie)
    this year i noticed a focused on average bond enthalpy with these types of questions, ESPECIALLY data book values, it also said to ignore heat loss or incomplete combustion
    I see what you mean. It's definitely a point. I do think for these question there maybe two or more answers to it. For me I was ensure with the fact if data book uses mean bond enthalpy and that's the reason why. Also it did say ignore heat loss to the atomosphere for sure.
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    (Original post by DaVinciGirl)
    It specifically said not to write about heat loss to the ATMOSPHERE.
    Exactly ATMOSPHERE not calorimeter
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    Yes you two are agreeing haha ^
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    I just rote "1.31%"
    Will I get the mark
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    (Original post by gcsekid)
    Exactly ATMOSPHERE not calorimeter
    I thought it said enviroment, not atmosphere.....so it's pretty ambiguous either way.
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    (Original post by gcsekid)
    Exactly ATMOSPHERE not calorimeter
    when they say heat loss to the atmosphere, they mean heat loss to literally everything else
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    (Original post by marcobruni98)
    Yes you two are agreeing haha ^
    Haha lol feels good when theres 2 of u agreein
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    (Original post by Splaffie)
    when they say heat loss to the atmosphere, they mean heat loss to literally everything else
    What was your answer btw??
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    (Original post by Splaffie)
    when they say heat loss to the atmosphere, they mean heat loss to literally everything else
    Well i dont call a calorimeter an atmosphere so they best well give me a mark
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    (Original post by Splaffie)
    when they say heat loss to the atmosphere, they mean heat loss to literally everything else
    You cannot be serious. I have already shown the answers from the book!
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    (Original post by gcsekid)
    Well i dont call a calorimeter an atmosphere so they best well give me a mark
    But the calorimeter is part of the atmosphere. Atmosphere doesn't mean air - it means everything external to what you're concerned about (in this case, the ethanol)
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    (Original post by rosemondtan)
    But the calorimeter is part of the atmosphere. Atmosphere doesn't mean air - it means everything external to what you're concerned about (in this case, the ethanol)
    google atmosphere m8
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    (Original post by marcobruni98)
    google atmosphere m8
    you dont understand, heat loss to the atmosphere means heat loss from the spirit burner
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    (Original post by Splaffie)
    you dont understand, heat loss to the atmosphere means heat loss from the spirit burner
    Yup!! Couldn't think of one so I just went for a generic answer - data booklet would have included different experiments to obtain an average value while this is one isolated experiment lmao
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    (Original post by rosemondtan)
    Yup!! Couldn't think of one so I just went for a generic answer - data booklet would have included different experiments to obtain an average value while this is one isolated experiment lmao
    especially since iirc in the specimen papers there was a question like this where the answer was mean bond enthalpy
 
 
 
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