Chemistry Predictions/Thoughts (1 Viewer)

[SadCeliac]

it can't explain stuff like BF3

sorry to break it to u but idt hard titrations exist

wtaf is BF3
and is it explaining that it is acidic or basic or what

 

[carrotsss]

wtaf is BF3
and is it explaining that it is acidic or basic or what

acid

 

[Unovan]

what's a limitation of BL theory of acids and bases

can't behave acidic/basic nature of salts ie. acetate I believe

 

[hungreypotter]

have they ever tested that very last dotpoint on chemical analysis of softdrinks, medicine etc in mod 6 bc i cbb to learn it

 

[hb0623]

have they ever tested that very last dotpoint on chemical analysis of softdrinks, medicine etc in mod 6 bc i cbb to learn it

it was in last years' paper pretty sure, the 6 mark question about calculating the concentration of triprotic acid in the soft drink

 

[qldbulls]

Am i gonna lose marks for being too accurate in the hsc I swear 90% of trial papers do their calculations with rounded figures at each stage
Am i using the store button for nothing??

 

[Unovan]

Am i gonna lose marks for being too accurate in the hsc I swear 90% of trial papers do their calculations with rounded figures at each stage
Am i using the store button for nothing??

No, you will lose marks if you aren't that accurate though
HSC papers never round until the end
For calcs either write out fractions or all decimal places for working is my recommendation

 

[rockydo4u]

can they ask us to integrate alcohols over Carboxyl functional group

=ln(carboxyl) + water

 

[carrotsss]

can they ask us to integrate alcohols over Carboxyl functional group

=ln(carboxyl) + water

you forgot the absolute value signs 🫡

 

[panikinprogress]

guys what are the rules for hnmr splitting with like the h atom of a primary/secondary amine and the h atom of an alcohol/carboxyllic acid and stuff like that?? like do they split or not?? or is it different for each circumstance help

 

[SadCeliac]

guys what are the rules for hnmr splitting with like the h atom of a primary/secondary amine and the h atom of an alcohol/carboxyllic acid and stuff like that?? like do they split or not?? or is it different for each circumstance help

Wdym?? I'm 90% sure that hnmr only shows hydrogen environments that are attached to carbons - OH's don't count
Pretty sure but you need to check that

 

[Unovan]

guys what are the rules for hnmr splitting with like the h atom of a primary/secondary amine and the h atom of an alcohol/carboxyllic acid and stuff like that?? like do they split or not?? or is it different for each circumstance help

its a separate h environment but no involvement with splitting

 

[SadCeliac]

its a separate h environment but no involvement with splitting

Hang on is methanol 2 environments or 1???
H3COH --> does the CH3 count as one H environment and the OH count as another? I'm not bothered to google rn

 

[carrotsss]

Hang on is methanol 2 environments or 1???
H3COH --> does the CH3 count as one H environment and the OH count as another? I'm not bothered to google rn

2

 

[ghreysantomy]

Hang on is methanol 2 environments or 1???
H3COH --> does the CH3 count as one H environment and the OH count as another? I'm not bothered to google rn

Proton environments exist wherever there are protons present in the molecule, no matter what they're attached to. @carrotsss is right, there will be 2 peaks on the H-NMR spectrum for methanol.

 

[synthesisFR]

just did 2020 hsc
bruh that exam was soo sooooo eazzzzz idk why ppl saying its hard
i messed up on the stupid titration thing tho i drew a curve instead of two lines so ill probably lose like 3 marks there rippp but everything else was aboslutely ezzz

 

[=)(=]

just did 2020 hsc
bruh that exam was soo sooooo eazzzzz idk why ppl saying its hard
i messed up on the stupid titration thing tho i drew a curve instead of two lines so ill probably lose like 3 marks there rippp but everything else was aboslutely ezzz

wait how long did it take u

 

[rockydo4u]

2021 paper completed in 2 hours 91 raw, lost 4 marks in mcqs silly mistakes and rest was on the silly mistakes and the bloody nitrogen question synthesis talked about

 

[synthesisFR]

wait how long did it take u

2hr 30
wait actually a bit more i think like 40 cus i went over some answers

 

[synthesisFR]

2021 paper completed in 2 hours 91 raw, lost 4 marks in mcqs silly mistakes and rest was on the silly mistakes and the bloody nitrogen question synthesis talked about

i figured out how to do that shi now but i hope its not in our exam still