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OCR F324-June 2013 Chemistry

Reply 1860

Mus1995

Original post by thers

Anyone want to revise?

Yeah man go for it.

Why are triglycerides not soluble in water?

Reply 1861

rukan

can anyone help me with the jan 2010 paper qs 5d

http://www.ocr.org.uk/Images/65129-question-paper-unit-f324-rings-polymers-and-analysis.pdf

thanks :smile:

Reply 1862

ihatepeople37

Sorry to be a pain but somebody posted some word documents consisting and questions and answers for different topics and I can't find them.... Total respect for anyone who can tell me the page number on the thread which has these documents

Reply 1863

thers

5

Original post by Mus1995

Yeah man go for it.

Why are triglycerides not soluble in water?

Triglycerides are non polar so cannot interact with polar water molecules (via hydrogen bonding) so are hydrophobic.

Turns out I've got to go now for a while - shouldn't have bothered saying who want to revise now.

I will give you a Q before I go tho

Define the term biodegradable polymer. [1]
Suggest two reasons why biodegradable polymers are inreasing in importance. [2]

Reply 1864

Raj Kang

Original post by rukan

can anyone help me with the jan 2010 paper qs 5d

http://www.ocr.org.uk/Images/65129-question-paper-unit-f324-rings-polymers-and-analysis.pdf

thanks :smile:

Look at the functional group attached to the benzene ring tha should give you an insight into the question. One has a carboxy group and other has oh group which is a phenol so with both naoh or na can bond. Only asprin na2co3 and only phenol 3br2

Reply 1865

wl1

8

Original post by Raj Kang

For nh2 and oh groups these are singlets because they have no adjacent protons by the n+1 rule. Splitting can only occur on adjacent protons, so the next carbon which has protons attached. If no protons are on adjacent carbons on ether side then that specific type of proton is going to be a singlet

Isn't the amine group in methionine attached to a carbon with a proton attached, though? So why isn't it a doublet? Sorry, my quote apparently didn't include the attachment. It was Q3 e iii on the Jan 13 paper.

Reply 1866

Mus1995

Original post by thers

Triglycerides are non polar so cannot interact with polar water molecules (via hydrogen bonding) so are hydrophobic.

Turns out I've got to go now for a while - shouldn't have bothered saying who want to revise now.

I will give you a Q before I go tho

Define the term biodegradable polymer. [1]
Suggest two reasons why biodegradable polymers are inreasing in importance. [2]

Correct.

It's alright.

A biodegradable polymer is a polymer that breaks down completely into Carbon Dioxide and Water.

Increased importance due to rising oil prices and need for reusable plastics. Biodegradable plastics can be recycled and reused.

Reply 1867

rukan

Original post by Raj Kang

Look at the functional group attached to the benzene ring tha should give you an insight into the question. One has a carboxy group and other has oh group which is a phenol so with both naoh or na can bond. Only asprin na2co3 and only phenol 3br2

thanks.. but aspirin and paracetamol both have a carbonyl group so why does the paracetamol only react with br2?

Reply 1868

Raj Kang

Original post by rukan

thanks.. but aspirin and paracetamol both have a carbonyl group so why does the paracetamol only react with br2?

Becuase paracetamol has phenol group and can decolourise orange bromine water and asprin had benze ring attached to carboxyl and cannot hence asprin does no react with br2

Reply 1869

Raj Kang

Original post by wl1

Isn't the amine group in methionine attached to a carbon with a proton attached, though? So why isn't it a doublet? Sorry, my quote apparently didn't include the attachment. It was Q3 e iii on the Jan 13 paper.

Think of it like this, groups that have nh2 or oh attached are always going to have splitting pattern of singlet. This is because it has to be adjacent to proton on the next carbon atom

Reply 1870

wakaas

Any predictions what is going to come up?

Reply 1871

rukan

Original post by Raj Kang

Becuase paracetamol has phenol group and can decolourise orange bromine water and asprin had benze ring attached to carboxyl and cannot hence asprin does no react with br2

oh okkk i get you now :smile:

thanks

Reply 1872

Sly1

6

Original post by D4rth

Well you've got 21 hours remaining. Ideally you should've completed all the past papers.
I would read over the specification, if there is something you don't know go and learn it quickly.

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I have finished all of them. I'm going to do them again.