Chemistry: Discussion, Questions & Potential Solutions

[Lear]

I think the second isomer given for 3biii is also incorrect. The correct one is drawn, however, for the skeletal formula.

[Sci-hopeful]

I think the second isomer given for 3biii is also incorrect. The correct one is drawn, however, for the skeletal formula.

Yes, you are correct 

It should have a 3C backbone 

[yash.k]

Hey, could someone please tell me what my study score would roughly  be from these scores:

SAC Avg: 80%
Exam Score 70-75%
Good cohort

Thanks 

[Azzzz]

Hey, could someone please tell me what my study score would roughly  be from these scores:

SAC Avg: 80%
Exam Score 70-75%
Good cohort

Thanks 

Hey! If you wish for people to predict study scores please post on the study score prediction thread since this is a thread based solely on chemistry questions. Also for future reference please provide your ranking within the cohort
https://atarnotes.com/forum/index.php?topic=138501.0
But with those scores, I think you are looking at around 35-37

[26985]

Thoughts on A+/A this year?

[Lear]

Thoughts on A+/A this year?

To be honest I’d say the same as last year but many will disagree. While most of the exam was pretty easy some questions such as the 4 panel question undoubtedly screwed people over. Also the exam was long..

[AlphaZero]

Hey all, we've noted the errors you guys have pointed out in the solutions. We'll get to fixing them ASAP.

Just so people know, I'm not doing the Chem and Physics solutions. I'll just be formatting the documents.

I wish I could help go through the Chem solutions but I wasn't that great at chem, so I'm pretty much useless here lol

[Sci-hopeful]

Hey all, we've noted the errors you guys have pointed out in the solutions.

Just so people know, I didn't write them. I just formatted the document. We'll get to fixing them ASAP.

I wish I could help go through the solutions but I wasn't that great at chem, so I'm pretty much useless here lol

Great job with formatting! Thanks for your efforts.

And a huge thanks to the solution writers too! What a bunch of geniuses!

[AlphaZero]

Great job with formatting! Thanks for your efforts.

And a huge thanks to the solution writers too! What a bunch of geniuses!

Well, I did the solutions for Methods and Specialist. Chem and Physics is done by someone else

[zenith101]

Does anyone know if there should be consequential marks for the 4 panel q if we didn't multiply by 4? If so, how many?

[Lear]

Does anyone know if there should be consequential marks for the 4 panel q if we didn't multiply by 4? If so, how many?

When marking I decided I'd only get one for that. I'm assuming 1 mark for recognition of 4 panels, one for working out and one for the >correct answer<. Probably only get the middle one.

[petersenge]

When marking I decided I'd only get one for that. I'm assuming 1 mark for recognition of 4 panels, one for working out and one for the >correct answer<. Probably only get the middle one.

To be honest I can see assessors giving 2 marks, 1 mark for correct utilisation Faraday's Laws/Equations, 1 mark for correct molar ratio and 1 mark for answer. However, the following 1 mark question based on your previous answer only awards 1 mark so that question requires the correct answer.

[Jiggleling]

Yeah, what's up with that crap? Such a stupid thing to do...

Hi! The odds are that VCAA will not award the mark for siginificant figures for that question

[Jiggleling]

WOW!!! Thank you so much! Truly amazing work - would have taken AGES to type up chemical structures!

Friendly FYI (zero disrespect, as your work is much appreciated)

1aiii is 2,3 dibromo 4-methyl hexane

2d Oxygen is evolved (not hydrogen)

3bi M(parent) = 73g/mol

5cii m(ethanol) = 11370g, which in then times by 29.6KJ/g (databook)

8cii n(petrodiesel) has not been inputted into the calculator correctly, affecting subsequent working out

9d Both experiments were turned off after 180 sec (identical graphs) to this point. Maybe a stirring issue between Student A and B???

Hi! Thankyou so much for providing this feedback. Most of it was identified and is fixed, a new copy will be uploaded tomorrow! We are so sorry for this confusion for the last question i suspect that the calibration started at 180, not stopped.

[G-Fr3sh]

Which one has the lower GI?

My teacher stated there were two possible answers:

1. The shredded pieces would have a higher GI, due to inceased surface area resulting in an increased rate of hydrolysis to produce glucose.

2. Both would have the same GI, due to the large coconut pieces required to be broken down by chewing the chunks into smaller pieces, increasing SA and Therefore Rate of Hydroysis to produce glucose