Recent content by nerdz1

Technically she is not allowed to disclose this information to the public as of yet.

I've been to both Ngo and Sons and Dr Du, and I must say, Dr Du is more catered towards students at the very top end because of the challenging questions he gives on a regular basis. He teaches Harder 3U in normal 3U classes (where there are students doing only 2U + 3U). From what I've heard...

But "lead-acid" wasn't one of the options you were given so even if you used it, likely you would not be awarded the marks.

This won't be helpful but tbh nobody can say definitively. Even though the general consensus seems to be that it was an "easy" paper, we still need to see how the state goes holistically. Also mark alignment can change dramatically from year to year, from memory, 85 went to 95 in one year whilst...

Yeah I think you're thinking way into it lol. BOS generally never extends into condensation with H2 or methanol product.

http://community.boredofstudies.org/attachments/1164/chemistry/32590d1445580512-general-thoughts-hsc-chemistry-2015-12046684_956764334395283_8188749964911151150_n.jpg I might be interpreting it wrong but I don't think it was equilibrium at 1L. Edit: My bad

Can somebody who got 10.6 for the K question show me how they did it? Thanks :)

By IUPAC convention, the brackets imply the if you essentially place the unit side by side, then it should work out to be the actual polymer. However, with D, this does not work. See: https://en.wikipedia.org/wiki/Repeat_unit and their example with condensation polymers. If you place the unit...

Can somebody confirm this? I personally do not think it is D because despite the hydroxyl groups reacting in the middle correctly, if you have 2 of these units placed side by side, you would have a C - O - O - C bond which should't be so right? I picked B because of this.

Citric acid is a triprotic acid.

98 would probably go to 99, and 99 stays at 99 or if you're lucky, goes to 100.

They should give you a "carry forward error" and pay the marks for (iii). :)

I think -1 realistically because it is technically only one error. They usually allocate 1M for one specific feature which needs to be included correctly e.g. axes + labelled graphs, scale...or something like that.

You would not get an undefined value because of the x^2, which would make it sqrt(9 - (-1)^2) = sqrt(8), which works out.

Yes you need to shade part of the third quadrant. This is because despite the "range" of the semicircle function in the preceding question, the inequality expands beyond it (in fact I suspect the question was placed there as a means of tricking). If you observe here...