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Chemistry Salters F332 june 2010

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Reply 480
Avatar for jamiet92
jamiet92
1
hollywoodbudgie
Hello everyone!
So how'd it all go?
Did the thread help in anyway? :smile:


Very helpful :smile: Thank you very much for starting it up :smile: x
hollywoodbudgie
Hello everyone!
So how'd it all go?
Did the thread help in anyway? :smile:



Definitely for the 'baking out' of CO2, only got that cozza this thread!
mattmitch22
Definitely for the 'baking out' of CO2, only got that cozza this thread!

Ahaha. I think I actually answered that question for someone before
but I might have put down the wrong answer in the exam! :blush:
What did you put?
Awesome!
I messed up the one after!
I put aldehyde instead of carboxylic acid.. propagation instead of termination! Such easyy and such stupid/silly mistakes!

Did you guys put:

Distillation to seperate the two liquids.. and anhydrous sodium sulphate - drying agent and the question above it said describe for two marks.. and i could only think of using a separating funnel!
Reply 484
Avatar for 388126
388126
Can somebody write an unofficial mark scheme for it? :|
Suuuuuuccchhh an easy exam :smile:
Definite A for chemistry then :biggrin:
Now just to get the same in physics maths and biology, eeaasssyyyyyyyyy! :biggrin:
hollywoodbudgie
Ahaha. I think I actually answered that question for someone before
but I might have put down the wrong answer in the exam! :blush:
What did you put?


Thermal decomposition of CaCO3, to release CO2 and CaO
Quite a few people pointed that out a couple o' days ago :biggrin:
Reply 487
Avatar for Kooper
Kooper
mattmitch22
It was under reflux, so i put carboxyllic acid

So did I. Wasn't a good question though. Like a lot of them.
FayeFayeFaye
Awesome!
I messed up the one after!
I put aldehyde instead of carboxylic acid.. propagation instead of termination! Such easyy and such stupid/silly mistakes!

Did you guys put:

Distillation to seperate the two liquids.. and anhydrous sodium sulphate - drying agent and the question above it said describe for two marks.. and i could only think of using a separating funnel!


DW about putting an aldehyde too much.
When you look at mark schemes, they usally have marks for both of them.
And if you reflux there is still quite a large chance that there will be aldehydes made,
after all it doesn't go STRAIGHT into becoming a COOH, so some COH will be made as well.

R-e-l-a-x :hugs:
Reply 489
Avatar for mhasan
mhasan
4
FayeFayeFaye
Awesome!
I messed up the one after!
I put aldehyde instead of carboxylic acid.. propagation instead of termination! Such easyy and such stupid/silly mistakes!

Did you guys put:

Distillation to seperate the two liquids.. and anhydrous sodium sulphate - drying agent and the question above it said describe for two marks.. and i could only think of using a separating funnel!


yh i put distillation aswell.

For the drying agent i put anhydrous copper sulphate. Will i get the mark or is it specifically sodium sulphate?
mhasan
yh i put distillation aswell.

For the drying agent i put anhydrous copper sulphate. Will i get the mark or is it specifically sodium sulphate?

They often have quite a few drying agents so most likely.
Even silica gel usually gets you marks! :lolwut:
Reply 491
Avatar for Paolat
Paolat
8
hollywoodbudgie
DW about putting an aldehyde too much.
When you look at mark schemes, they usally have marks for both of them.
And if you reflux there is still quite a large chance that there will be aldehydes made,
after all it doesn't go STRAIGHT into becoming a COOH, so some COH will be made as well.

R-e-l-a-x :hugs:



ok good coz i wrote aldehyde LOL :smile: x
Reply 492
Avatar for JamesPen
JamesPen
1
What did everyobe get for the electrophillic addition one?

I put four bromines but i dont know if that is right?
JamesPen
What did everyobe get for the electrophillic addition one?

I put four bromines but i dont know if that is right?


Yeah, that's right.

There were 2 lots of C=C bonds, hence 2 moles of Br2 molecules.

as long as you got 4 Br on the drawing, you're fine.

I wish there was a feature on this forum to let me put images without getting a hyperlink, so I can show you what the answer is. :smile:
What was the answer for the first ionic equation?
I think I put

3H+ and 3H- in the spaces?
kironkabir
Yeah, that's right.

There were 2 lots of C=C bonds, hence 2 moles of Br2 molecules.

as long as you got 4 Br on the drawing, you're fine.

I wish there was a feature on this forum to let me put images without getting a hyperlink, so I can show you what the answer is. :smile:


See that's what I did as well, but i also put a Br where the OH group
was... I'm really not sure if that was a smart move on retrospect. :sad:
Tell me what you guys think.
Reply 496
Avatar for Doctogan
Doctogan
hazzawazza19
What was the answer for the first ionic equation?
I think I put

3H+ and 3H- in the spaces?

6 for the first gap and 6e- for the second.

I put down e- without the 6 for some reason though!!
Doctogan
Definitely not 4 Bromines but I probably got it wrong too.

I put two bromines. One where each c=c double bond was.



Mate, it was four bromines.

LOOK.

If one C=C bond can facilitate 2 bromines, then two C=C can facilitate 4 bromines.

2 x 2 = 4. Simple

And remember, there were 2 lots of C=C.
Look at the bromination of alkenes again to see what I mean.
hazzawazza19
What was the answer for the first ionic equation?
I think I put

3H+ and 3H- in the spaces?


Well you needed 6 hydrogens
er I don't quite remember what I put, it was 6H+ and e- I think.
Er... H- doesn't tend to happen. H- is an isotope of hellium isn't it? :hugs:
DW!!! :biggrin:
What were the 2 similarities and difference?

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