• Best of luck to the class of 2024 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here
  • YOU can help the next generation of students in the community!
    Share your trial papers and notes on our Notes & Resources page
MedVision ad

Chemistry Predictions/Thoughts (4 Viewers)

herbimycin

New Member
Joined
Oct 22, 2024
Messages
27
Gender
Male
HSC
2024
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
 

appleali

Active Member
Joined
Jun 15, 2023
Messages
303
Gender
Male
HSC
2024
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
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
 

lidess23

New Member
Joined
May 11, 2023
Messages
18
Gender
Male
HSC
2024
Like for titre volume if you match it (you have to use a mol ratio for Z btw) you get that Y and Z have the same titre volume. But since Z is symmetrical it is the third 1.
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.
 

ManifestationIsKey

Active Member
Joined
Oct 25, 2024
Messages
134
Gender
Male
HSC
2024
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

New Member
Joined
Oct 22, 2024
Messages
27
Gender
Male
HSC
2024
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

Active Member
Joined
Oct 25, 2024
Messages
134
Gender
Male
HSC
2024
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

Active Member
Joined
Oct 16, 2023
Messages
128
Gender
Female
HSC
2024
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

New Member
Joined
May 11, 2023
Messages
18
Gender
Male
HSC
2024
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

New Member
Joined
Oct 22, 2024
Messages
27
Gender
Male
HSC
2024
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

Active Member
Joined
Jun 15, 2023
Messages
303
Gender
Male
HSC
2024
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

New Member
Joined
Oct 22, 2024
Messages
27
Gender
Male
HSC
2024
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
 

scoobie29

New Member
Joined
Apr 1, 2024
Messages
1
Gender
Female
HSC
2024
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 😭😭
 

Users Who Are Viewing This Thread (Users: 0, Guests: 4)

Top