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Hi Everyone, This is the q29 of the 2019 Chemistry HSC question. My answer is at the very bottom (method: find the equation of the lines of best fit and then plug in values to get output. It is wrong though. The answer was that the treatment was effective for Cu ions but not for Pb ions. Anyone...

I don't know how to do C. Here my working. I used the fact that "modulus of cross product of two vectors = area of the parallelogram enclosed by those vectors" The base/floor/subscript vector in the projection expressions is the arbitrarily chosen vector (1,1,0) which has a z=0 coordinate since...

so my school is ranked in the 10s to mid 20s, I got 75% for my first ext 1 maths internal, the average was 60% but my ext 2 math was 88% and average was 78% and highest was about 94% my chemistry was 90%, average was 70-ish% my English was 18/20 (average unknown) and highest was 20/20 and my...

Hi everyone, so for extension 2maths, can people contribute a list of results that, although obvious, would require proof before being used in the exam? For example, I wonder if you can only apply the triangle inequality and Cauchy-schwarz vector version inequality after proving it somewhere...

What is the difference between how the "two texts collide, align or mirror each other in a certain aspect" versus how the "two texts explore common issues, etc"? Arent they just both synonymous versions of "What is similar and what is different between their presentation of ideas?"

Hi everyone, So for both extension 2 and 1, which of the identities in the Reflections, shifts, and periodicity category of the wikipedia page on "List of trigonometric identities" do I need to know? I somehow can't attach the link

is there anyone here who is really qualified for private tutoring extension 2 confidently and seriously?

Hi Everyone, Would someone please kindly supply some criticism for this following past paper? I did one for abbot sleigh recently and there was some constructive feedback for that one too if people want to check it out so maybe this thread might help as well.

so Hello Everyone, Abbotsleigh past papers are actually pretty full-on. Is there anybody here who has finished the HSC or can give good constructive advice on my responses to this Abbotsleigh paper I did? I would appreciate it very much, and I am sure many others will, indirectly, be extremely...