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

alevels2k17

14

Hi everyone, i made this thread since i couldn't find any..

Reply 1

PlayerBB

17

Hiya guys! I did IAL chemistry last year and I'll be glad to help anyone with questions related!

hi

what are you guys finding the most difficult so far

Reply 4

alevels2k17

OP

14

acids and bases , pastpaper wise :angry:

Reply 5

me2*

13

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-5z54uPRQvUbV83Z1lMRll1cE0

Reply 6

alevels2k17

OP

14

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-5z54uPRQvUbV83Z1lMRll1cE0

thank u!!!!! i really needed this xxx

Reply 7

me2*

13

Original post by pondsteps

thank u!!!!! i really needed this xxx

tell me if you need something else as well!

Reply 8

alevels2k17

OP

14

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????

Reply 9

me2*

13

Original post by pondsteps

thank u so much honestly xx are u sitting the paper this Jan????

yes

Reply 10

alevels2k17

OP

14

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

Reply 11

me2*

13

Look at the specification

Reply 12

alevels2k17

OP

14

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 ...

Reply 13

me2*

13

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