OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

Yeah I could be wrong but I think for the tyre marks it may be 1)condensation polymer is hydrolysed into its monomers 2) cooh and oh bonds 3) firm hydrogen bonds with water

Idk though not trying to cause arguments

Hmmm, does seem correct tbh. I hope I've maybe got a mark, if not I've got 8marks definite wrong which is concerning.

Reply 2281

CalistaJupiter

2

Original post by lai812matthew

what is a backbone actually.

It's just like the carbon carbon backbone not including side branches

Reply 2282

CalistaJupiter

2

Original post by S.Ahmad

Hmmm, does seem correct tbh. I hope I've maybe got a mark, if not I've got 8marks definite wrong which is concerning.

No you never know, everyone else could be wrong... We all just want to believe our answers are right so whoever argues more everyone takes their answer haha

Reply 2283

Randall13

8

What was the question on chromatography?

What did you have to write?

Reply 2284

MrZebraCookie

2

Would Kevlar be accepted for the polyamide question? Was it asking for a general use or?

Reply 2285

slugmonkey97

6

Original post by Jamil_dow

Alright in my opinion
Question 6
f= ch3ch2chohch2ch3
g= chech2coch2ch3
h= ch3ch2cooh
i= ch3ch2cooch((ch3ch2)(ch3ch2ch2))
j= (ch3)3choh, becuase 0.221/2.85x10- = 74

your answer for f only has 3 carbon envirnments as is symmetrical, earlier in the question you had to identify there were 4 carbon environments in f, therefore the structure is CH(CH3)2CHOHCH3 correct me if im wrong

Reply 2286

user2498

1

guys what was the answer to the question on the important difference between forming some compound by chemical synthesis or fermentation of sugars.

Reply 2287

slugmonkey97

6

Original post by CalistaJupiter

Yeah I could be wrong but I think for the tyre marks it may be 1)condensation polymer is hydrolysed into its monomers 2) cooh and oh bonds 3) firm hydrogen bonds with water

Idk though not trying to cause arguments

thats exactly what i put, hope were right lol

Reply 2288

Hutch28

2

Original post by slugmonkey97

your answer for f only has 3 carbon envirnments as is symmetrical, earlier in the question you had to identify there were 4 carbon environments in f, therefore the structure is CH(CH3)2CHOHCH3 correct me if im wrong

I got the same as you

Reply 2289

slugmonkey97

6

Original post by user2498

guys what was the answer to the question on the important difference between forming some compound by chemical synthesis or fermentation of sugars.

basically if its formed by fermentation of sugars by the bacteria, the products would only be of one optical isomer, however if produced by chemical synthesis, it is possible for both of the optical isomers to be produced

Reply 2290

lai812matthew

10

Original post by CalistaJupiter

It's just like the carbon carbon backbone not including side branches

what i found

Reply 2291

Heffalump .

8

I wrote 2-hydroxylpropanoic acid instead of 2-hydroxypropanoic acid do you think i'll get marked down? For the lactic acid question

Reply 2292

S.Ahmad

10

Original post by slugmonkey97

basically if its formed by fermentation of sugars by the bacteria, the products would only be of one optical isomer, however if produced by chemical synthesis, it is possible for both of the optical isomers to be produced