Chemistry Predictions/Thoughts (7 Viewers)

[coolcat6778]

Did anyone notice something strange about Question 15? The correct option was immediately obvious.
With my OP guessing skills, I scored 16/20 in section 1 (if I only answered the question I could do, I would've gotten 8/20) I'm actually pissed I didn't get 17/20 there was one equilibrium question I could've answered without guessing tho

 

[Luca26]

What if I just plotted the points, no line or anything else?

See how everyone presents their graphs for discrete stuff as well, nobody is using primary school column graphs.

You can't draw a trend from a column graph, but you can from a scatterplot. Part (ii) asked for a trend.

Where do you think you're getting a trend if you treat them as discrete (by drawing a column graph)?
View attachment 50337
View attachment 50338

Just plotting points, rather than columns, is fine IMO. Joining the dots is (formally) problematic as it implies some continuous change against an x-axis that only allows discrete values. It is less bad when the x-axis is numbers as in the IE graphs you show, as opposed to the discrete categories identified on the x-axis in the label of the HSC question. I am guessing that the markers will accept column, points, and joined points, but not a LOBF.

 

[eternallyboreduser]

Just plotting points, rather than columns, is fine IMO. Joining the dots is (formally) problematic as it implies some continuous change against an x-axis that only allows discrete values. It is less bad when the x-axis is numbers as in the IE graphs you show, as opposed to the discrete categories identified on the x-axis in the label of the HSC question. I am guessing that the markers will accept column, points, and joined points, but not a LOBF.

Bruh this is chem not math why is this shit so complicated

 

[BionicMango]

They did not explain a lot of this in the syllabus tbh

 

[Luca26]

Bruh this is chem not math why is this shit so complicated

Representing data in graphical / diagram form is absolutely core science

 

[hm...mmmm]

U guys reckon a raw 74 could allign upto an 80?

 

[coolcat6778]

U guys reckon a raw 74 could allign upto an 80?

thats so high... yes.

 

[hm...mmmm]

I mean 74 feels pretty bad since everyone keeps saying it was the easiest exam so far. But yea hopefully I atleast get 80

 

[BionicMango]

I mean 74 feels pretty bad since everyone keeps saying it was the easiest exam so far. But yea hopefully I atleast get 80

I do not think it was the easiest exam so far, it will definitely scale equal to or better than last year AND 2023 (the latter is more likely). Too many trick questions imo.

 

[barnyard]

I mean 74 feels pretty bad since everyone keeps saying it was the easiest exam so far. But yea hopefully I atleast get 80

me and my friends all agree this was prob the hardest hsc so far not sure what that means for scaling if ppl are so conflicted

 

[BionicMango]

People said similar things for physics last year and it scaled well. When it’s this divided it’s because it’s niche-er and therefore will scale better.

 

[C2H6O]

People said similar things for physics last year and it scaled well. When it’s this divided it’s because it’s niche-er and therefore will scale better.

pleasepleaseplease be right

but 'good' scaling in chem is sht anyways

 

[BionicMango]

pleasepleaseplease be right

but 'good' scaling in chem is sht anyways

Yeah but good scaling in physics is pretty good, 81 became 90 last year and people were divided whether it was easier or harder

 

[pigeon729]

Is the paper out yet

 

[C2H6O]

Is the paper out yet

https://www.nsw.gov.au/sites/default/files/noindex/2025-11/2025-hsc-chemistry.pdf

 

[pigeon729]

thanks ethanol

 

[barnyard]

do u think i'll lose marks in the second last question for saying the base peak was due to the cooh- bc i had no clue and i thought i would have mention the base peak?

 

[C2H6O]

do u think i'll lose marks in the second last question for saying the base peak was due to the cooh- bc i had no clue and i thought i would have mention the base peak?

no idea how they thought we would even reason this cause the real spectra has the molecular ion peak as the base peak
either they are testing our reasoning to think that we cannot predict base peak in which case probably but i doubt theyll assess it like this
other alternative more likely is if your reasoning for the base peak is theoretically correct they give marks
i myself didn't specify base peak cause i had no clue whether it was identifiable so dk if ill loose marks for not trying to reason. i just labelled the other peaks as "Other major peaks"

 

[carrotlover123]

wait guys, do ur exam invigilator tell yall to add an exam row for the carbonylic acids for the last question, like 9-13 ppm?

 

[barnyard]

no idea how they thought we would even reason this cause the real spectra has the molecular ion peak as the base peak
either they are testing our reasoning to think that we cannot predict base peak in which case probably but i doubt theyll assess it like this
other alternative more likely is if your reasoning for the base peak is theoretically correct they give marks
i myself didn't specify base peak cause i had no clue whether it was identifiable so dk if ill loose marks for not trying to reason. i just labelled the other peaks as "Other major peaks"

well i said the cooh- would have the base peak bc the bonds in hydroxyls and carbonyls are the strongest in the whole molecule so that fragment is gonna stay together the most often? idk if thats even a correct explanation tho if that isnt actually the base peak
but i think all the solutions ive seen online did what u did