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holy crap they're good marks budz. congrats. ill prob get mine tommorrow

But nobody would care about the SC still so people would just get lower marks in it, plus, the hsc isn't that hard. You do have to know you're stuff but its not mind boggling

Just remember, a good tutor doesn't mean doing well in maths. You've gotta put in the work and do the study your tutor tells you. If he/she doesn't mention studying/homework he is a retard so get a new tutor

I had 5 exams in a school week. I'm sure the school is allowed to do it. It isn't that hard if you know you're stuff

Yeah, thats amazing, i want to be like you

I think the first question is written up properly, its impossible that would happen as its written. If it was 3 cards chosen it would be prob=3/¹²C₃ =3/220

you can always delete messenger if you're feeling desparate

Thanks a lot, I'm doing Anthony and Cleopatra and this site looks pretty helpful

that was quick, hadn't even put up the poll

Just wondering, what takes up the majority of your time when studying for chemistry.

The Macquarie textbook has a good overview of PHAs and, when combined with other secondary sources (google), gives you all the info you need. That's how I did it

OK, it can exist, but not without a + charge on it

Yeah, the problem is that NH₄ has a charge of +1 and therefore can't exist by its own as you have put

When people say a 1 molar solution of acid, they mean a 1 mole/litre solution, if thats what you mean. Its really confusing because sometimes in exercises they can also say 1M HCl.

er, it actually says 500kg, and the question is how many moles... I don't have a calculator with me, but with the second question, don't you just multiply this number of moles by 2, and then multiply by 1.6. Man I'm lazy

Year 11, just understand the concepts, don't sit there doing questions heaps because marks don't matter that much, however the understanding of what you're doing is

Ba(NO₃)₂+Na₂SO₄ -----> 2NaNO₃+BaSO₄ Then, work out the mass that should be created: n=m/M =.222/261.3 =.000850 moles Now, for the barium sulfate, n=m/M .000850=m/233.4 m=.198g Impurity=.198/.259*100 =76.6% EDIT: Happy?

I'm actually planning on doing about 1 hour all holidays, then on ANZAC day doing about 12. Then i don't have the problem of forgetting it before school resumes

Writing notes through the term then reviewing them the day before the exam worked for me

I'd be in for that