OCR B Salter's Chemistry by Design F335 - 15th June 2015 Watch

diba786
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For the solubility question.....with PH3 and NH3 what did people say.....it was 4 or 5 marks?
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Minecraft27
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(Original post by JakeDaw)
Salters had to go throw what I said last night about being able to draw hexagons well in my face by making us draw an octagon. They're just purposely trying to mess with us


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Didn't your year 1 teacher tell you how to draw octagons?
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king cobra
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(Original post by BrokenS0ulz)
The structure for which protons were responsible for Each peak in the nmr

I got 12
How many marks ?


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Welbeck
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was the last question a ketone or aldehyde? I put ketone, but think it may be aldehyde
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Remedium
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I got pH 10 as you have to take into account the dilution factor and use the Kw formula.

The total solution volume was 55cm3 so divide moles by 0.055 to get 1x10-10

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Minecraft27
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(Original post by diba786)
For the solubility question.....with PH3 and NH3 what did people say.....it was 4 or 5 marks?
Nitrogen can form hydrogen bonds with water, phosphorus can't etc etc etc.
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BrokenS0ulz
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(Original post by king cobra)
How many marks ?


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(Original post by Welbeck)
was the last question a ketone or aldehyde? I put ketone, but think it may be aldehyde
I think it was aldehyde
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exams567
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the thing i found tricky was some of the 'suggest' an equation to write
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Remedium
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Carbon monoxide produced in the suggest question?


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Solarburst
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(Original post by Welbeck)
was the last question a ketone or aldehyde? I put ketone, but think it may be aldehyde
(Original post by Minecraft27)
Nitrogen can form hydrogen bonds with water, phosphorus can't etc etc etc.
Aldehyde.

Did you put that phosporous was slightly soluble because the lone pair forms H bonds as well?
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Minecraft27
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(Original post by Welbeck)
was the last question a ketone or aldehyde? I put ketone, but think it may be aldehyde
Aldehyde.
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username1082804
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(Original post by Minecraft27)
This paper was much better and much more accessible than that rotten first paper.

Anyone else get pH of 3.26 and 7.08?

There were 5 isomers of chlorophenol right? Also, the NMR one had the chlorine on the bottom carbon, I got.
I got 3.3 for the first pH, but I got 12 or 13 for the second one
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MrChemKid
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(Original post by Welbeck)
i got ph=10
The question was 25cm3 of acid reacted with 30cm3 of naoh with both being 0.02moldm-3
i got 10
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Minecraft27
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(Original post by Solarburst)
Aldehyde.

Did you put that phosporous was slightly soluble because the lone pair forms H bonds as well?
Phosphorus doesn't hydrogen bond with water at all. Only nitrogen oxygen and fluorine can.
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king cobra
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(Original post by Remedium)
Carbon monoxide produced in the suggest question?


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Nah co2 as heated strongly


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Millie0118
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(Original post by diba786)
For the solubility question.....with PH3 and NH3 what did people say.....it was 4 or 5 marks?
I said P is less electronegative than N (which might not be true), therefore weaker or no dipole between P-H therefore no H bonding
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username1082804
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What did you guys get for the H-S-H bond angle? and for the C2H2? Did you draw a triple bond between carbon atoms?
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Minecraft27
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I predict about 85 for an A, 76 for a B.
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king cobra
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(Original post by Minecraft27)
Phosphorus doesn't hydrogen bond with water at all. Only nitrogen oxygen and fluorine can.
And phosphorous is less
electronegative



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king cobra
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(Original post by Minecraft27)
I predict about 85 for an A, 76 for a B.
Percentage or marks ?


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