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Igcse chemistry edexcel - paper 1c (13.5.14) watch

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    to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
    And why are polymers non biodegradable ?
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    (Original post by Ammar97)
    to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
    And why are polymers non biodegradable ?
    I said because they are inert
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    i also said that due to their inertness.Diamonds question i have written that iamond has a atomic structure bonded by covalent bond of carbon and carbon atoms . The structure formed mannered as a tetrahedral arrangement . This tetrahedral arrangement makes diamond very hard by forming strong intermolecular forces. To discreet this interaction a lot of energy is required. ( Is it correct , if it , how many marks i would get from 4 marks )Candidates what you have written , using burette instead of pipette )I have written , pipette measures the fixed volume .
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    (Original post by Ammar97)
    to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
    And why are polymers non biodegradable ?
    Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?
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    (Original post by D_Vadgama)
    Isn't in that any topic can come in any of the two papers. It's only that paper 2 is more experiment based.

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    YOU must check the specifications so many things we dont need to know for paper 1 and only for paper 2
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    (Original post by Jackhay)
    Oh yeah, was that the one where before it asked for the moles or conc. of NaOH and it was like 0.25/0.25?
    Yeah, but that was, like, the first or second part. The answer to the very last part should be 8.8...
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    (Original post by amamsy)
    Yeah, but that was, like, the first or second part. The answer to the very last part should be 8.8...
    thats a relief that I have done it, thanks
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    (Original post by amamsy)
    Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?
    As temp of solution decreases, so does the solubility of salts, so as a saturated solution cools it is thrown out of solution.
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    (Original post by Jackhay)
    As temp of solution decreases, so does the solubility of salts, so as a saturated solution cools it is thrown out of solution.
    Could you talk about water of crystallisation left in it?


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    (Original post by amamsy)
    Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?
    i wrote for the polymers, because of the way that they are bonded nothing can be go through them, or something like that would i get the mark >.<

    edit: because microorganisms cannot break them down*
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    (Original post by GCSEsitter)
    Could you talk about water of crystallisation left in it?


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    How do you mean?
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    (Original post by Jackhay)
    How do you mean?
    That when the solution is heated and cooled there is still a bit of water left which is in the ionic structure as water of crystallisation


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    (Original post by a-spiringmedic)
    i wrote for the polymers, because of the way that they are bonded nothing can be go through them, or something like that would i get the mark >.<

    edit: because microorganisms cannot break them down*
    I don't think so, because it says on the specification exactly "understand that these polymers do not easily biodegrade as they are inert". But it's only a one-mark question, so don't worry too much
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    (Original post by amamsy)
    I don't think so, because it says on the specification exactly "understand that these polymers do not easily biodegrade as they are inert". But it's only a one-mark question, so don't worry too much
    didn't see that on the spec thanks tho
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    anyone plz answered my questions , that diamond was
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    (Original post by GCSEsitter)
    That when the solution is heated and cooled there is still a bit of water left which is in the ionic structure as water of crystallisation


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    The crystallisation is the 3d giant lattice structure, but it has water 'locked' inside the crystal, hence CuSO4.5H2O
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    (Original post by a-spiringmedic)
    didn't see that on the spec thanks tho
    I think it is not only the fact it is inert, but also Polymers such as this have never been seen by decomposers before, and thus they do not have the enzymes to deal with it.
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    Can anyone tell me what the last question on the chemistry paper was exactly i.e what was the equation they gave or does anyone have access to the actual paper. Thanks very much, much appreciated
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    (Original post by GCSEsitter)
    Can anyone tell me what the last question on the chemistry paper was exactly i.e what was the equation they gave or does anyone have access to the actual paper. Thanks very much, much appreciated
    All I can remember was that it was definitely 2 moles of NaOH (In the equation it was "2NaOH") reacting with 1 mole of the other substance which I can't remember
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    Diamonds question i have written that iamond has a atomic structure bonded by covalent bond of carbon and carbon atoms . The structure formed mannered as a tetrahedral arrangement . This tetrahedral arrangement makes diamond very hard by forming strong intermolecular forces. To discreet this interaction a lot of energy is required. ( Is it correct , if it , how many marks i would get from 4 marks )Candidates what you have written , using burette instead of pipette )I have written , pipette measures the fixed volume . PLZ ANYONE QUESTION MY ANSWER
 
 
 
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