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OCR B (Salters) Chemistry F331 (Chemistry for Life) Thursday 23rd May Exam Discussion Watch

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    If for the carbon neutral and sustainable biofuels question I put No or less CO produced and that there are no waste products formed, and they all have a use do you reckon that's 2 marks? I won't get the third because I basically just blabbed on about random stuff and didn't mention CO2 and plants hahaha
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    I'm scared I'll fail this exam. I was confident to do this paper and every time I feel confident, I get too many questions wrong. This is sometimes too much!


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    (Original post by amber109)
    I felt I did well in that test, until I started reading this thread <img src="images/smilies/frown.png" border="0" alt="" title="" smilieid="11" class="inlineimg" />
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    I feel your pain. :/
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    (Original post by krisshP)
    What did everyone say for the question where we were asked to say 2 things we'd observe when calcium mixes with water or whatever the question was?

    I said precipitate forms and hydrogen gas released
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    (Original post by Ikklemini)
    I said precipitate forms and hydrogen gas released
    Yeah I wrote steam will be observed since hydrogen gas forms and a solid calcium hydroxide will form. I however forgot to use the word precipitate, I was too taken back by how easy that paper was, and hence all these stupid mistakes. Might end up on a B if grade boundaries are really high (they will be)
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    (Original post by nukethemaly)
    Yeah I wrote steam will be observed since hydrogen gas forms and a solid calcium hydroxide will form. I however forgot to use the word precipitate, I was too taken back by how easy that paper was, and hence all these stupid mistakes. Might end up on a B if grade boundaries are really high (they will be)
    I wrote white solid instead of precipitate, they might accept it?
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    (Original post by Sledgeo)
    I wrote white solid instead of precipitate, they might accept it?
    I hope so. Ah I'm so worried now I dropped really really silly marks.
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    (Original post by RevisionEssence)
    The answer was [H2O]+ right?
    Did we have to put the H2O in square brackets? I just wrote H2O+
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    (Original post by nukethemaly)
    I hope so. Ah I'm so worried now I dropped really really silly marks.
    Same and I read the last question wrong, thought it was about oxygen not water so lost some marks there! But don't worry about it now because can't change it just focus on F332!
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    (Original post by Ikklemini)
    Did we have to put the H2O in square brackets? I just wrote H2O+
    I didnt put square brackets. In a past paper question from f331 I've seen with ions before the answers been in the brackets but there's a side not that says they're not necessary to score the mark. So basically, your answer will be fine
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    feel much more confident after reading this thread. hopefully a High A..need the UMS

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    Think I got the assumptions one wrong but for the enthalpy change one I said that no heat was lost to the surroundings and that the reaction had completed
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    (Original post by Ikklemini)
    Did we have to put the H2O in square brackets? I just wrote H2O+
    I don't think so; the convention we use for things like carbonate ions don't usually contain brackets.
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    (Original post by krisshP)
    What about effervescence, I think it means bubbling, no too sure what it means myself,
    yeah that should score a mark
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    for the assumptions questions I put for the m c delta t one;
    1) that all of the reactants reacted
    2) that the hcl volume did not decrease after heating
    for the dating one I put
    1) that the rock hasn't been contaminated over time
    2) that you are testing the sample in question, not a sample of something that came into contact with the sample
    how many marks do you think I've lost? really stressing out as I need to get an A in this exam
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    I don't remember an assumption question :O

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    for the ion one i wrote o 2-
    that would give 18 wouldnt it, and its an ion....
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    (Original post by aislinnreid)
    for the assumptions questions I put for the m c delta t one;
    1) that all of the reactants reacted
    2) that the hcl volume did not decrease after heating
    for the dating one I put
    1) that the rock hasn't been contaminated over time
    2) that you are testing the sample in question, not a sample of something that came into contact with the sample
    how many marks do you think I've lost? really stressing out as I need to get an A in this exam
    that sounds fine! Don't think you will have dropped many for that at all..
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    (Original post by AdibC)
    for the ion one i wrote o 2-
    that would give 18 wouldnt it, and its an ion....
    Wouldnt produce the highest peak like it said it would though, a water ion would, a fragmented ion with a mass of 18 which although would be present, would have a very low abundance. Also the oxygen ion would be O+ anyway. Even if it was right you've wrote it down wrong.
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    (Original post by aislinnreid)
    for the assumptions questions I put for the m c delta t one;
    1) that all of the reactants reacted
    2) that the hcl volume did not decrease after heating
    for the dating one I put
    1) that the rock hasn't been contaminated over time
    2) that you are testing the sample in question, not a sample of something that came into contact with the sample
    how many marks do you think I've lost? really stressing out as I need to get an A in this exam
    2/4 there. Someone said it all looks fine, but the enthalpy question asked forapproximations made, not assumptions. The carbon dating question I think you'll get atleast 1/2 for that.
 
 
 
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