VCE Chemistry Exam Discussion and Solutions (in progress)

[JaeSunRyoo]

Mind that suggested solutions do not necessarily reflect VCAA marking, so some additional things may be accepted if the assessors feel lenient.

Naturally, given that the sample solutions that get released here aren't official afaik.

Still, it'd be good to see what others think so we can actually discuss the questions a bit further.

[barryexo]

is the solutions posted up yet?

[lovebiology]

Are they up??

[messi10]

Are they up??

The solutions will be up soon

[AvogadroCadabra]

I don't want to burst your bubble, but I'm pretty sure hydration was what they wanted, looking over my notes now.

Addition seems to general, but answers.... wait, WHERE ARE THE SOLUTIONS???

pretty sure they'll accept addition... once they accepted 'covalent' for a question asking for the type of bond because even though it wasn't what they asked for it technically wasn't wrong... so i'm sure addition is accepted. same goes for ether/glycosidic link etc.

[2352300]

Killed myself trying to understand calorimetry when none of it was there ?! The Mars question was an actual fuck up. At this point I'm hopping on board the submarine filled with that volatile H2

[bentennason]

where is the exam copy

[2352300]

where is the exam copy

Copyright issues with matt damon atm soz

[Srd2000]

Does spelling matter for the exams? Like if I spelt 'asphyxiation' as 'asphixiation', will I get the marks? Thanks

[occidit]

Does spelling matter for the exams? Like if I spelt 'asphyxiation' as 'asphixiation', will I get the marks? Thanks

As long as it's understood you should get the marks, unless it's a total cooked spelling.

[Deonyi]

I believe they did penalise misspellings of 'glycosidic' though.

[Srd2000]

But like a non-VCE-chem word should be fine? Like asphyxiation? Cheers

[katg]

I reckon it was the volume of NaOH. That's what I put anyways, pretty sure I'm wrong.

The independent variable was the percentage purity of the tartaric acid, as that what was affecting the titre volume.
Whilst not being manipulated, it was neither controlled nor the dependent variable. The volume of NaOH was the dependent variable, the concentration of NaOH was controlled, and the volume of tartaric acid solution was also controlled.

[messi10]

The independent variable was the percentage purity of the tartaric acid, as that what was affecting the titre volume.
Whilst not being manipulated, it was neither controlled nor the dependent variable. The volume of NaOH was the dependent variable, the concentration of NaOH was controlled, and the volume of tartaric acid solution was also controlled.

I think the concentration of tartaric acid was the independent variable since the percentage purity is not a variable in the experiment and just a result of calculations that require concentration of tartaric acid. The titre is not independent because it depends on concentration of tartaric acid
I hope that clarifies some issues.

[JaeSunRyoo]

I think the concentration of tartaric acid was the independent variable since the percentage purity is not a variable in the experiment and just a result of calculations that require concentration of tartaric acid. The titre is not independent because it depends on concentration of tartaric acid
I hope that clarifies some issues.

If that's the case, how would one "control" or manipulate the concentration of tartaric acid? From what I can remember, the question stated that you had 30g of the commercial sample that was diluted to 500ml and then take aliquots from that.

Can you really say that you can manipulate the concentration when you don't even know how much the % of tartaric acid is even there in the first place? The only thing we know in relation is the manufacturer's claim on its purity.

I'd like to think the manipulated variable would have been the sample used, i.e. the tartaric acid sample itself, since we are testing the validity of the manufacturer's claim on the purity of the product.