Edexcel IAL Chemistry Unit 2 (WBIO2) / June 10th 2016

Original post by I <3 WORK

What were the answers to the Multiple Choice Questions:

1. About how many peaks 1,2 dichloroethane had - I wrote 3 but not sure.
2. How many moles of Sodium Sulfate reacted - I wrote 1.00 mol but I'm pretty sure I'm wrong due to the wrong method I think I used.

Also the question that asked to draw the structure of ClO7 - how many marks was that?

Damn that was quite a hard exam! :s-smilie:

it was for one mark
what was the section for the 1 mol in the MCQ a b c or d
also what did you choose for the spectra

Reply 122

Hossam121

1

I found the exam ok aswell. But there are many small things I'm unsure about in my answers.
I wrote down the first 16 MCQ answers on my calculator before time ran out, this is what I got: BCACDDDDADBBDABB, didn't have time to write down the last 4.
If you wrote down your MC aswell share them so I can compare :smile:

Reply 123

what do you think the minimum mark for A for this session?

Reply 124

Original post by mr.holmes

it was for one mark
what was the section for the 1 mol in the MCQ a b c or d
also what did you choose for the spectra

It was D I think but not 100% sure, what did you write? And I wrote there were 3 peaks but again I'm not too sure.

Reply 125

Original post by I <3 WORK

It was D I think but not 100% sure, what did you write? And I wrote there were 3 peaks but again I'm not too sure.

i wrote 3 too
what was the answer for % uncertainty?
and what was the compound represented by the mass spectra?
Also, how was the reaction of iodobutane and the other compound( it included the ammnoia)

Reply 126

Original post by mr.holmes

i wrote 3 too
what was the answer for % uncertainty?
and what was the compound represented by the mass spectra?
Also, how was the reaction of iodobutane and the other compound( it included the ammnoia)

I think it was 0.05/0.5 if I remember correctly (something with a 5 anyway). I think it was a ketone I wrote but not sure. And you mean the reaction with ammonia to produce an amine?

I wrote it to be:

2NH3 + 1-Iodobutane => Butylamine + NH4I

So do you remember what you wrote for Sodium Sulfate moles? (It was part D I think of the MC)

(edited 7 years ago)

Reply 127

Sandy_Vega30

OP

9

Original post by Becka99

What did you write for the product of water with Cl2O7 .
And in the mcq which gave a peak at m/e value 31

It's HClO4.

Reply 128

Original post by I <3 WORK

I think it was 0.05/0.5 if I remember correctly (something with a 5 anyway). I think it was a ketone I wrote but not sure. And you mean the reaction with ammonia to produce an amine?

I wrote it to be:

2NH3 + 1-Iodobutane => Butylamine + NH4I

So do you remember what you wrote for Sodium Sulfate moles? (It was part D I think of the MC)

i wrote 1 i think its D
and yes i did the same equation as you did
but i wrote an aldehyde for the spectra not sure either.....

Reply 129

Original post by mr.holmes

i wrote 1 i think its D
and yes i did the same equation as you did
but i wrote an aldehyde for the spectra not sure either.....

I'm really not too sure to be honest, I tried to rush with the MC just because I knew the other questions I would take more time in. And what about the Stage 3 of the reaction with Barium Nitrate - what did you write for that solid? I wrote BaO but I've no idea. The last question was also a bit confusing - I wrote it's larger for Iodine and smaller for Titre, what about you?

Reply 130

Sandy_Vega30

OP

9

Molecular ion peak is 3.
IR spectra produced belonged to propanone.
Mass of Iodine 114.2g.
Percentage Uncertainty: 1%
Sodium Sulfate moles : 0.33 (not sure of the answer).
Structure of Cl2O7 : Google it. Its on wikipedia.

Paper was not that bad. What was the White solid produced at step 3? I wrote BaO.

Reply 131

Original post by mr.holmes

i wrote 3 too
what was the answer for % uncertainty?
and what was the compound represented by the mass spectra?
Also, how was the reaction of iodobutane and the other compound( it included the ammnoia)

Actually I just realised it was 1% for the percentage uncertainty I wrote. :wink:

Reply 132

Original post by I <3 WORK

I'm really not too sure to be honest, I tried to rush with the MC just because I knew the other questions I would take more time in. And what about the Stage 3 of the reaction with Barium Nitrate - what did you write for that solid? I wrote BaO but I've no idea. The last question was also a bit confusing - I wrote it's larger for Iodine and smaller for Titre, what about you?

i wrote the same BaO for stage 3
for the last question, i i did no change for titre and a smaller change for iodine
i used the first paragraph in the question were it said something about the unsaturation and iodine

Reply 133

Sunethra

6

Original post by Sandy_Vega30

Molecular ion peak is 3.
IR spectra produced belonged to propanone.
Mass of Iodine 114.2g.
Percentage Uncertainty: 1%
Sodium Sulfate moles : 0.33 (not sure of the answer).
Structure of Cl2O7 : Google it. Its on wikipedia.

Paper was not that bad. What was the White solid produced at step 3? I wrote BaO.

I got the same answers as you. For 0.33 I just guessed and crossed 0.33 because I ran out of time. But everything else we have the same

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Reply 134