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OCR Salters Chemistry F335 12th June 2013 Exam revision thread Watch

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    I just remembered that this forum supports spoilers!

    Whoever wanted to see the curly arrows diagram for the mechanism, this is what I put.
    Spoiler:
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    (Original post by billybobs)
    UNreactive
    Yeah. Autocorrect is ruining my life.

    (Original post by billybobs)
    What did people put for the question that asked suggest something about amino-acids in the comet?

    Something to do with suggestion that life exists/existed because organisms create amino-acids? xD
    Most bizarre question of the paper I wrote about "looking for life elsewhere in space" haha...

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    (Original post by Harantony)
    I just remembered that this forum support spoilers!

    Whoever wanted to see the curly arrows diagram for the mechanism, this is what I put.
    Spoiler:
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    Yay! I got it.
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    i put time instead of retention time. Is the word retention essential?
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    the maths killed me... i need an A... damnnn!!!
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    (Original post by stealth_writer)
    i put time instead of retention time. Is the word retention essential?
    I think so
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    How many marks was the curly arrow question?
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    What did people get for the buffer solution calculations. Did u have to use [h+]= ka x acid/salt but we didnt have the concs of The salt given and even the acid conc was well back on the previous page.

    what about the question where it said "NaOH was added so that it reacted with half of the m/ethanoic acid(can't remember) what is the change in pH now
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    (Original post by LOLAKALMAO)
    How many marks was the curly arrow question?
    3 marks.
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    (Original post by Sujman)
    I think so
    why?
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    (Original post by stealth_writer)
    i put time instead of retention time. Is the word retention essential?
    mhmm
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    (Original post by stealth_writer)
    i put time instead of retention time. Is the word retention essential?
    yeah it is because it has to specifically be the amount of time spent in the column, sorry
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    (Original post by LOLAKALMAO)
    How many marks was the curly arrow question?
    3 marks
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    What did people get for the % increase Q?
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    (Original post by Sam1357)
    What did people get for the buffer solution calculations. Did u have to use [h+]= ka x acid/salt but we didnt have the concs of The salt given and even the acid conc was well back on the previous page.

    what about the question where it said "NaOH was added so that it reacted with half of the m/ethanoic acid(can't remember) what is the change in pH now
    Was literally just about to ask this! Can't really remember the question, but think I got pH 3.something for first part, and 4.something for the second part?

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    (Original post by billybobs)
    700 and something, 793 I think?
    i got a number like that... complete guess though!
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    Did anyone divide Ka by three for the neutralisation of half the acid question?
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    Any else get 180 as iodine number of very last question?
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    how many marks was all the mass spec worthy including the give the formula bit, i got it all wrong thought it was the highest peak, so maybe i miss ready the question
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    (Original post by Reina)
    Did anyone divide Ka by three for the neutralisation of half the acid question?
    i did that! there was a similar q on the january 2013 paper
 
 
 
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