IAL chemistry 12/1/2017 unit 4 exam revision thread

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alevels2k17
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#1
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#1
Hi everyone, i made this thread since i couldn't find any..
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PlayerBB
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#2
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#2
Hiya guys! I did IAL chemistry last year and I'll be glad to help anyone with questions related!
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me2*
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hi
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queenoflean
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what are you guys finding the most difficult so far
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alevels2k17
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#5
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acids and bases , pastpaper wise
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me2*
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i worked really hard for this......... hope its of use to you guys out there

i compiled this from all over the internet, from sample pages from amazon google and cgp website!

https://drive.google.com/open?id=0B-...V83Z1lMRll1cE0
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alevels2k17
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#7
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(Original post by me2*)
i worked really hard for this......... hope its of use to you guys out there

i compiled this from all over the internet, from sample pages from amazon google and cgp website!

https://drive.google.com/open?id=0B-...V83Z1lMRll1cE0
thank u!!!!! i really needed this xxx
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me2*
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(Original post by pondsteps)
thank u!!!!! i really needed this xxx
tell me if you need something else as well!
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alevels2k17
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#9
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#9
(Original post by me2*)
tell me if you need something else as well!
thank u so much honestly xx are u sitting the paper this Jan????
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me2*
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(Original post by pondsteps)
thank u so much honestly xx are u sitting the paper this Jan????
yes
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alevels2k17
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#11
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Guys do we need to learn the reactions that occur when aldehydes react with Fehling's & Benedict's / tollens reagents .. Those
Please answer fast i need to know xxxxxx
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me2*
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#12
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Look at the specification
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alevels2k17
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#13
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(Original post by me2*)
Look at the specification
Yes I did it says describe the reaction but I don't know how far it want me to go ...
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me2*
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#14
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They are qualitative tests the important thing is
1)why these tests are used: to determine the type of carbonyl compund (aldehyde/ketone)
2)what colour changes take place
3)why those colour changes take place (for this remember that these involve oxidation reactions i.e. reagent is reduced and the carbonyl compound is oxidized ..... see below )

The important thing is that these are oxidation reactions used to find out what type of carbonyl compound the substance is and the fact that
1)aldehydes are readily oxidized
2)ketones arent

Hence if the test is positive substance is an aldehyde otherwise the substance is a ketone
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me2*
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(Original post by pondsteps)
Yes I did it says describe the reaction but I don't know how far it want me to go ...
Its an added benefit if you know the conditions reagents etc....
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Electrify
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#16
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I am sitting this tomorrow. Do you think it will be as hard as the June 2016 paper?
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alevels2k17
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#17
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(Original post by Electrify)
I am sitting this tomorrow. Do you think it will be as hard as the June 2016 paper?
So far this session has been ****ed up so let's hope it won't be as hard as the other exams 💔
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Electrify
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(Original post by pondsteps)
So far this session has been ****ed up so let's hope it won't be as hard as the other exams 💔
Biology yesterday was a lot of fun
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alevels2k17
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#19
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#19
U did well in in biology?
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Electrify
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#20
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(Original post by pondsteps)
U did well in in biology?
It was awful
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