[Zebra-Zahra]

Looks like I'll be resitting that...again

I'm really annoyed with myself because I worked hard for it and then I messed it up!!

[x_Melissa_x]

(Original post by Zebra-Zahra)
Looks like I'll be resitting that...again

I'm really annoyed with myself because I worked hard for it and then I messed it up!!

Me too!

I was getting over 90% on all the past papers and mock papers, then I got in the exam room and thought "Sh.it I don't know anything!" So fucjking annoyed with myself!

[bex_1_2_1]

I think I did pretty bad. Another resit I much preferred the June paper looking back over it.

[x_Melissa_x]

Does anyone remember the answer to "What is the name of Compound B?" It was the question with something to with ethene at the beginning I think....

I can't remember what I put, but my friend put "dibromodimethylethane" and was wondering if it was right?

[planetconwy1]

(Original post by x_Melissa_x)
Does anyone remember the answer to "What is the name of Compound B?" It was the question with something to with ethene at the beginning I think....

I can't remember what I put, but my friend put "dibromodimethylethane" and was wondering if it was right?

Oh i didnt realise you were on this post also I think it was 2.3-dibromobutane but im not sure

[x_Melissa_x]

(Original post by planetconwy1)
Oh i didnt realise you were on this post also I think it was 2.3-dibromobutane but im not sure

Haha, I'm everywhere! Thanks

[Zebra-Zahra]

(Original post by x_Melissa_x)
Does anyone remember the answer to "What is the name of Compound B?" It was the question with something to with ethene at the beginning I think....

I can't remember what I put, but my friend put "dibromodimethylethane" and was wondering if it was right?

We were discussing this earlier in class and my teacher said that they were likely to accept:

1,2-dibromo-1,2-dimethylethane (with or without the numbers)
1,1-dibromo-2-methylpropane
2,3-dibromobutane

I'm not sure whether these answers are ACTUALLY correct, it's just what my teacher said

[AnonyMatt]

(Original post by Zebra-Zahra)
We were discussing this earlier in class and my teacher said that they were likely to accept:

1,2-dibromo-1,2-dimethylethane (with or without the numbers)
1,1-dibromo-2-methylpropane
2,3-dibromobutane

I'm not sure whether these answers are ACTUALLY correct, it's just what my teacher said

I don't get it, all those are totally different compounds. :/

Unless, the question asked you about a compound that COULD have been any of those things.
I didn't see the paper, I didn't do it.


How's everyone feeling for CH4?

I really like the proteins topic, and all the spectroscopy stuff, but I'm struggling to remember all the conditions and reactants for processes.
And I HATE polymers!

[Zebra-Zahra]

(Original post by AnonyMatt)
I don't get it, all those are totally different compounds. :/

That's what I thought, but he said that it depends how you number them or something I'm rubbish at chem so I didn't get any of those answers anyway

I hate CH4 with a passion. I can't remember all the reagents, conditions, mechanisms etc

[Zebra-Zahra]

Maybe we could start a reagents/conditions/mechanism list on this thread? Or does that sound like too much work/nerdy?

[planetconwy1]

(Original post by Zebra-Zahra)
That's what I thought, but he said that it depends how you number them or something I'm rubbish at chem so I didn't get any of those answers anyway

I hate CH4 with a passion. I can't remember all the reagents, conditions, mechanisms etc

I hate CH4 too! I just did a past paper and it seems like they ask really random questions in every paper. The one I did asked for the mechanism for free radical Substitution of Chlorine with Methane. I am also struggling to remember all the reagents and conditions

[AnonyMatt]

(Original post by Zebra-Zahra)
Maybe we could start a reagents/conditions/mechanism list on this thread? Or does that sound like too much work/nerdy?

I would love that tbh. I barely know any though!

Carboxcylic acid and alcohol -> ester + water

The worst thing is that I don't have any material. I'm not in chemistry lessons in college, and I forgot I threw out all my past papers and mark schemes last summer. D:

[x_Melissa_x]

Yeah, a list sounds good!

Okay, from my notes.....

Chlorination of benzene:

-Electrophilic substitution
-Absence of light
-Room temperature
-Anhydrous conditions
-Presence of a halogen carrier, e.g. aluminium chloride

Product is chlorobenzene

[x_Melissa_x]

The Friedel-Crafts Reaction

-Benzene is treated with iodomethane
-Presence of aluminium chloride
-Room temperature
-Anhydrous conditions
-Electrophilic substitution

Product is methylbenzene

The reaction is sometimes called 'alkylation' - introducing an alkyl group into a benzene ring

If an acyl halide is used, a ketone is formed

[x_Melissa_x]

Are there any particular ones that people would like to know?

I've borrowed lots of different textbooks from school so I'm sure I could find pretty much anything in them

[x_Melissa_x]

Forming alcohols from halogenoalkanes

-When an alkane is warmed with aqueous NaOH, the corresponding alcohol is formed.

-Sn2 (Nucleophilic substitution by a bimolecular process)



Alcohols from carbonyl compounds

-Carbonyl group may be reduced by lithium tetrahydridoaluminate(III), sodium tetrahydridoborate(III), sodium and ethanaol, and zinc and ethanoic acid.

[x_Melissa_x]

Alcohol + carboxylic acid

-Presence of conc. sulfuric acid
-Forms esters
-Often called 'esterification'



Elimination of alcohols

-Excess of conc. sulfuric acid
-180°C
-Elimination of a molecule of water
-Alkene formed



Oxidation of alcohols

-Aqueous potassium dichromate or aqueous sulfuric acid

[Agolas]

Hey everyone

My teacher has said that 10% of the CH4 marks can come from CH2 is this correct?
Some of the past papers such as 'june 2009 CH4' has got the electrophilic addition of HBr and the mechanism isn't that from CH2 ? or is this an old spec exam paper cause I'm sure the first CH4 new spec exam was in jan 2010 ? CONFUSED XD?!

Thanks guys :')

[planetconwy1]

(Original post by Agolas)
Hey everyone

My teacher has said that 10% of the CH4 marks can come from CH2 is this correct?
Some of the past papers such as 'june 2009 CH4' has got the electrophilic addition of HBr and the mechanism isn't that from CH2 ? or is this an old spec exam paper cause I'm sure the first CH4 new spec exam was in jan 2010 ? CONFUSED XD?!

Thanks guys :')

Hey again,
January 2010 was the first paper of the new syllabus. They changed the element of the paper that had a CH2 content and replaced it with a general synoptic element. So they can basically ask you anything within reason about any of the CH1 & CH2 stuff.

btw thanks for the info about liverpool its handy to know, and im really nervous since its my first medical interview

[Agolas]

Oh jeez that's panicked me quite a bit now I know all of CH1 and CH4 but I haven't looked at CH2 since summer D:! better start having a look Thanks again!

It was my first interview too I had two really young doctors and they make you feel really at ease Good luck and no problemo!