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Octanol and decanoic acid both have water solubility < 0.005 M (ie. less than 1 percent). They would each appear as an immiscible layer floating on top of water, so for practical intents & purposes, they are water insoluble. I agree with you that many chemical properties lie on a continuum and...

International Chemistry Olympiad (abbreviation is IChO).

I think most of us have a tendency to think we did worse in an exam than we really did and if you found it challenging, a lot of students probably did as well - media coverage seems to suggest this is the case...

Fractional distillation is based on different boiling points of individual gases. The boiling point of nitrogen is -196 degC, so that’s the temperature at which the nitrogen gas will turn to liquid and can be poured off. The only equation I can think of would be the enthalpy balance equation...

What you’ve shown is true, but not the complete picture. Substitution of the cytosine nucleotide (C) could just as likely have been to a G or A. The possible resultant mRNA triplets could have been AAC or AAT, either of which would have produced an amino acid change from lysine to asparagine...

I imagine that by scaling extension students up, it’s quite compacted at the top, so amongst the cohort with a scaled mark of 100 would be a range of raw marks, but anyone who achieves a raw mark of 100 deserves to be equal first. Students in different schools who achieve a perfect score in the...

Before the new Head of Maths arrived, my eldest wasn’t even allowed to work ahead in preliminary or 2U maths (her teacher, who thankfully retired, even complained to me about it at P-T interviews).

It’s entirely at the discretion of the school. The top selective schools do offer acceleration in other subjects (for example agriculture at JRAHS), which lightens the number of units & study load in Yr 12. Our local school previously wouldn’t offer acceleration. My eldest studied all 14 units...

I’ve always assumed from your profile & posts that you too have been accelerated in maths. Extn 1 can be studied in parallel or before Extn 2; the preliminary (Yr 11) course must be completed before either can formally commence.

My ‘dear son‘ who is in Yr 11 & only accelerated in maths.

DS did actually realise both of these properties which made him think the region was much more complicated than it turned out to be, so time ran out before he started on the proper graph. He has a lot of rough workings & sketches, but no idea whether they'll count for much. Overall, he thought...

They stated that there are only four genotypes and showed that anyone who is dominant for both traits has both dominant genes on the same chromosome (type 1). Therefore the male of the original couple must be type 1. His partner only carries recessive alleles and every partner that has joined...

It’s an inequality, so you still have to work out what regions to shade. DS didn’t get to that bit. Did everything else but didn’t have time to check the rest of the paper, so could have lost marks on ‘silly mistakes’ as he did with the Adv Maths & Ext 1 papers in previous years.

I think the answer should be A (2/14) but I'm wondering if you have posted this question because either you or whoever set the exam considers B (3/16) to be the appropriate answer.

Keq is the general term for the equilibrium constant to describe a reaction mixture at equilibrium. It is calculated by the product of the quantities of each/all of the products divided by the quantities of each/all of the reactants: ie. For reaction aA + bB + cC ⇌ xX + yY + zZ Keq = [X]^x...

Only have time for a brief reply but might help to point you in the right direction: - Monoclonal antibody therapy isn’t gene therapy (noting your post vs title of thread). - They are synthesised but the way they act is the same as the antibodies our bodies produce. - Each mAb targets a...

You’ve still got a year to go before your HSC exams, so I think it’s not inappropriate to offer this general advice: Wherever possible, seek to understand the concepts which underlie the dot points in the curriculum. It is much, much easier to remember information when you understand how it fits...

My main point, though, is that questions can be challenging, but shouldn't be ambiguous, to avoid penalizing students for gaining knowledge. Option C isn't truly correct.

The existence of these regions turns this MCQ into one which can potentially handicap someone who has additional knowledge.

Thank you for your reply Popsandtops. From your HSC year, I was wondering if your intel might come from a relative?? I’d also love to find out if any of the colleges have a piano or keyboard that residential students can access. We were hoping that my son would get the opportunity to scope out...