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Edexcel IAL Chemistry Unit 01 - 26th of May, 2017 Watch

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    Can someone explain why there is an increase in the temperature here even though the reaction is endothermic? And I basically don't understand the shape of the graph at all...


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    (Original post by Droneon)
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    Can someone explain why there is an increase in the temperature here even though the reaction is endothermic? And I basically don't understand the shape of the graph at all...


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    That paper is May 2015 unit 3. Well I just realized I'm supposed to post this in the unit 3 thread XD


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    (Original post by Droneon)
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    Can someone explain why there is an increase in the temperature here even though the reaction is endothermic? And I basically don't understand the shape of the graph at all...


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    The reaction is endothermic, so the reaction mixture cools quickly at the start to drop below room temperature. Then after the reaction is over, the temperature of the product mixture will rise back up as heat energy from the room is transferred to it. Leave it for long enough, and the solution will reach room temperature again.

    It's like leaving a cube of ice in a room: it will melt, and its water will heat to room temperature because air molecules that collide with the liquid molecules will transfer some of their kinetic energy to the liquid molecules, and thus heat up the liquid.
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    (Original post by K-Man_PhysCheM)
    The reaction is endothermic, so the reaction mixture cools quickly at the start to drop below room temperature. Then after the reaction is over, the temperature of the product mixture will rise back up as heat energy from the room is transferred to it. Leave it for long enough, and the solution will reach room temperature again.

    It's like leaving a cube of ice in a room: it will melt, and its water will heat to room temperature because air molecules that collide with the liquid molecules will transfer some of their kinetic energy to the liquid molecules, and thus heat up the liquid.
    But it would never return to the temperature of the initial reaction mixture right?


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    (Original post by Droneon)
    But it would never return to the temperature of the initial reaction mixture right?


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    The first solution in the beaker is initially at room temperature. At the moment of adding the second reactant, the temperature drops until the reaction has finished. The temperature difference between the air and the liquid will cause the mixture's temperature to then increase over time. This continues until there is no temperature difference, ie until the liquid mixture in the beaker reaches room temperature again. This would probably take longer than the time on the graph, hence the graph does not show it reaching initial temperature yet.
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    (Original post by K-Man_PhysCheM)
    The first solution in the beaker is initially at room temperature. At the moment of adding the second reactant, the temperature drops until the reaction has finished. The temperature difference between the air and the liquid will cause the mixture's temperature to then increase over time. This continues until there is no temperature difference, ie until the liquid mixture in the beaker reaches room temperature again. This would probably take longer than the time on the graph, hence the graph does not show it reaching initial temperature yet.
    That totally helped, thank you so much!!


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    (Original post by Reshyna)
    First of all, I was doing a past paper and I came up with a doubt.
    This is the question.
    Attachment 610556
    Why is the answer A instead of B. Why can't B be the answer?
    george facer page 202 explains it and in
    ann fullick AS chemistry page 187
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    (Original post by Reshyna)
    If a carbon-carbon single bond is known as sigma bond, and a carbon-carbon double bond consists of a sigma bond and a pi bond, then what about carbon-carbon triple bond?
    What bonds does it contain?
    i checked the books and there was nothing on triple bonds and their respective pi and sigma bonds
    it isnt required by our specification
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    (Original post by azrah vakil)
    george facer page 202 explains it and in
    ann fullick AS chemistry page 187

    If you can please send me a link to where I can get a pdf for the George facer book
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    (Original post by Crystal_M)
    If you can please send me a link to where I can get a pdf for the George facer book
    do u have an ebook account because there's one link that requires ur ebook account

    and i only found a revision guide of the george facer book https://www.hoddereducation.co.uk/me...le-Chapter.pdf
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    Is everyone ready for the exam?
    How are preparations going on guys?
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    (Original post by Reshyna)
    Is everyone ready for the exam?
    How are preparations going on guys?
    havent started yet.. i can only focus on this after C12 exam tomorrow
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    (Original post by zooshan)
    havent started yet.. i can only focus on this after C12 exam tomorrow
    Hey is there a C12 thread


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    (Original post by Droneon)
    Hey is there a C12 thread


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    i havent found one.. are u doing c12 then?
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    (Original post by zooshan)
    i havent found one.. are u doing c12 then?
    Yes I am. How's the prep going? I've done only a few papers and I'm trying to keep the concepts in my head until the exam at least lol am I the only one who has been focusing a lot on the other subs besides math lol?


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    (Original post by Droneon)
    Yes I am. How's the prep going? I've done only a few papers and I'm trying to keep the concepts in my head until the exam at least lol am I the only one who has been focusing a lot on the other subs besides math lol?


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    ohh.. finally someone who is doing c12..
    i have done the papers.. my teacher asked to do jan 16 june 10 and jan 17
    i just keep making elementary stupid mistakes...
    not only u.. studying four subjects is hard.. and then there is c34 :/
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    (Original post by zooshan)
    ohh.. finally someone who is doing c12..
    i have done the papers.. my teacher asked to do jan 16 june 10 and jan 17
    i just keep making elementary stupid mistakes...
    not only u.. studying four subjects is hard.. and then there is c34 :/
    I keep doing the same thing! :/ Oh so you're doing A2 maths as well? Wow I can't imagine how tough that might be. Yeah I'm taking four too...


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    (Original post by Droneon)
    I keep doing the same thing! :/ Oh so you're doing A2 maths as well? Wow I can't imagine how tough that might be. Yeah I'm taking four too...


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    ohh u must AS level then.. yeah its hard.. and i have chem the day after.. sigh..
    just hope its a moderate paper,.. i feel too drained to do anymore questions tonight.. hbu?
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    (Original post by zooshan)
    ohh u must AS level then.. yeah its hard.. and i have chem the day after.. sigh..
    just hope its a moderate paper,.. i feel too drained to do anymore questions tonight.. hbu?
    Hoping the same honestly. Yeah I am. I have bio the day after and then Chem on Friday.
    I am so done rn, I'm trying to solve a logarithm ques rn and I just can't concentrate.


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