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Sulfuric acid is diprotic and releases two hydrogen ions, so you multiply the concentration by 2 and then do logs. H2SO4 + H2O -----> HSO4- + H3O+ HSO4- + H2O <------> SO4(2-) + H3O+

How was the test difficulty in regards to the 2013 CSSA paper?

Wot

In my opinion, carrying 13 units to the HSC is very stupid... Your 10 best units are going to count, therefore a whole years of work for a particular subject and an extra unit will be gone to waste as it won't be counted. You will be creating additional stress for yourself and the workload would...

yes, milk is slightly acidic! and so is tea

Paper 1 on thursday :(

Really? Ive been told by several people... So how does it work then?

The way they work out your internal marks is through the cohorts performance in the HSC exam. Your rank determines which mark you will receive as your internal, for example the person who is internally ranked 1st, will get the highest external HSC mark as their internal mark. YOU keep your...

Lawson question easy or hard?

Why are you using concentration? Its asking for mol of bromine not concentration... I got 0.232 Products of electrolysis of dilute NaCl are hydrogen ions and oxygen at the anode. Cathode = Hydrogen gas and hydroxide ions.

I have paper 1 on thursday and then 4 unit maths on the friday :blink2:

no worries ! :D

http://topscores.info/select-nsw.php#pagehere Tells you how many students got band 6 in each subject ^^^^

She's on 12 units atm, if she picks up french extension then that means she'll probably drop chemistry because its her shittest subject, unless she somehow does 13 units which is stupid because only 10 best units get counted and she's limiting herself by doing an extra 3 units. Anyways if she...

I thought the way to do this question using series and sequences was to split the number into 2 and 0.8181818181 and then 0.81818181 is the same as 81/100 + 81/10000 + 81/1000000 + .... this ends up being a GP, and then you use the limiting sum formula , a/1-r which gives 9/11. Then 2+9/11...

Highly doubt you'll get asked a question worth beyond 3 marks about instruments that measure radiation. Just have a rough idea of the 4 instruments - Photographic film - darkens when in contact with radiation. This is because of the reaction within the silver halide crystals of the film Geiger...

You replied while i was editing my comment haha :P what i meant was that because of the aligning process, it is much easier to get a band 5 or higher in advanced than in standard. for example last year raw mark of 68/105 in advanced was an 81 HSC mark, whereas standard, the raw mark was much higher

Advanced only scales slightly more than standard, not by a huge amount. Its much easier to get a band 5 or higher in advanced than standard. And you can always drop to standard in year 12 if you're struggling, but do advanced.

The standard solution (substance with known concentration) goes in the burette.

Autocorrect, didn't even realise lol