Chemistry Predictions/Thoughts (1 Viewer)

[ManifestationIsKey]

h-nmr

Thats Q38

Q35 was "Identify which structures 1, 2 and 3 in the table are acids X, Y and Z. Justify your answer with reference to the information provided." Surely we dont have to refer to it all, they gave so much info that you didn't really need

Yeah you really didn't need to use everything, like I put the answers before showing anything, but then just ended up showing everything since if they've provided it you probably gotta show its importance

 

[herbimycin]

bro i talk about all info just in case. like for the one with the h-nmr i talked about every single data point and the environment each peak was from

lol i just drew the two possible structures for E and looked at one of the peaks and showed how it only exists in one of them. I thought about adding the titration stuff for all the compounds but really didn't want to bother so i didnt

 

[ManifestationIsKey]

The titration data couldn’t actually be used to distinguish between Y and Z right. I just used it as a confirmation, after using the 2 other data to determine the compound identities.

Yeah, you needed to show that since Z only forms 1 product it is symmetrical and since number 3 is symmetrical that is Z and since Y forms 2 products it is asymmetrical and thus it is 1. The Titration data was only to split between X and (Y and Z). For X you could have just said that since it doesn't decolourise it doesn't have a C=C and then use the titration data to show that the MM matches the titre volume (or vice versa).

 

[randomuser246]

lol i just drew the two possible structures for E and looked at one of the peaks and showed how it only exists in one of them. I thought about adding the titration stuff for all the compounds but really didn't want to bother so i didnt

I drew the two options as well and then eliminated

 

[lidess23]

lol i just drew the two possible structures for E and looked at one of the peaks and showed how it only exists in one of them. I thought about adding the titration stuff for all the compounds but really didn't want to bother so i didnt

did you have to talk about all hnmr data points. You only needed the last two ngl, but now I’m worried I lost marks there

 

[herbimycin]

Yeah, you needed to show that since Z only forms 1 product it is symmetrical and since number 3 is symmetrical that is Z and since Y forms 2 products it is asymmetrical and thus it is 1. The Titration data was only to split between X and (Y and Z). For X you could have just said that since it doesn't decolourise it doesn't have a C=C and then use the titration data to show that the MM matches the titre volume (or vice versa).

yeah thats pretty much what i did. i just hope they don't say you have to go over the titration bit for full marks bc you didn't need it and so i didn't use it

 

[appleali]

did you have to talk about all hnmr data points. You only needed the last two ngl, but now I’m worried I lost marks there

nah pretty sure you didnt but i had time so i was like why not.

 

[appleali]

yeah thats pretty much what i did. i just hope they don't say you have to go over the titration bit for full marks bc you didn't need it and so i didn't use it

hmmm i wouldve used all data but i think itll be fine as long as it was elaborate enough

 

[herbimycin]

did you have to talk about all hnmr data points. You only needed the last two ngl, but now I’m worried I lost marks there

i just talked about 1 (i think the one with 6 H nuclei in it and was a doublet). it only existed in one of the two possible molecules i think

 

[user1207]

Damn nice, gunning for sr? I'm hoping for 92+ depending on how they mark the 7 marker and my writing

same for me

 

[user1207]

mcq was not too bad right?

yea i thought it was pretty good

 

[scoobie29]

Guys , if i put two methods in that last question and one of them is right but i didn’t cross out the wrong one will they be sweeties and let me have the mark

 

[hughjanus_]

Guys , if i put two methods in that last question and one of them is right but i didn’t cross out the wrong one will they be sweeties and let me have the mark

no chance

 

[help2024]

guys was structure A 1-bromopropane?

 

[herbimycin]

guys was structure A 1-bromopropane?

think so. either that or 2-bromo, cant remember which way round it was

 

[herbimycin]

what did you guys get for 25 (phosphate ions)?

 

[Mannyg]

yeah,

guys was structure A 1-bromopropane?

A was 1-bromopropane as it hydrated to become a primary alcohol, while B was 2-bromopropane as it hydrated to become a secondary alcohol.

 

[Ishi081]

what was the shapes around the carbon atoms
was it trigonal planar and tetrahedral.

 

[help2024]

do you think I can get one mark for writing the dissociation equation for last q or no?

 

[Ishi081]

in the second last question how many marks would I get if I calculated the mass of the halogen and found it to be bromine (but later on wrote the wrong compound writing F - idk how I ended up doing that) and I got the structures of A and B (except the Flourine part) but not E with the correct justifications for A and B?