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Nope the hydrogen would stay in solution. I probably should have stated 'more active metals' but we are mainly focusing on Iron which is above Hydrogen.

Firstly: Steel is an iron alloy containing no more than 2% carbon. Adding chromium increases resistance to corrosion because chromium is one of those passivating metals producing the inert layer resistant to corrosion. Secondly: Molybdenum increases resistance to corrosion as well as strength...

Similar to metal displacement, Hydrogen will come out of solution while the metal will go into the solution (become an ion) I apologise it isnt really all that clear without the + or - to indicate ions.

I agree because then it gives my answer :p

I got 4/7 but I dont know if this is right: Total number of ways the cards can be arranged: n = 7! = 5040 Ways in which first OR last are A: n = 2 x 3 x 4 x 5! = 2880 P(E) = 2880/5040 = 4/7

Hi all this is an essay I wrote, in 40 mins, answering the CSSA Trial Question: Could someone take a look, comment and give a mark out of 15.

Theres two main reasons why Acidic environments accellerate corrosion: 1. Take a look at the Standard reduction potentials for Oxygen in acidic and neutral environments: 1/2 O2 + H2O + 2e -> 2OH 0.40 V 1/2 O2 + 2H + 2e -> H2O 1.23 V From the above results you see the standard potential...

The HSC mark reported on your results is not used in the calculation of your UAI, the raw marks are used and it is these marks that are scaled. Also Maths is out of 120 not 105 ;)

Yes I was wondering how you miraculously answered the question before it was asked :p

The inequality is chopped off at the bottom all I see is 'given that PR - PQ = QR show that' and then its cut off.

On average I get done around 6-7 hrs each day which is plenty for me since ive been studying throughout the year. I find maths and maths ext easiest to study for because I dont get bored studying it. Same with Physics and Chemistry. English and Religion just bore me to tears so I dont do as...

Ive got one of the trial questions and our half yearly question if that helps: How have the texts you have studied this year effectively shaped your understanding of the varied types of journeys that exist and how they can have an impact on peoples lives? 'When we travel, we often focus on...

I think either works, it's more personal preference and what is easier for you. I structure by texts which doesn't work too bad and my marks weren't any better when I atgtempted structuring by what the text is saying about the topic in question. So yeh, either way works fine just do what is...

Thanks for that, I knew there was some reason why the sum of those two angles was 65.

The sum of the two angles is always the same because the third angle is always the same due to angles in same segment rule. I dont believe my explanation is an actual rule as at that pint I got stuch for an official rule explaining it but... As P moves closer to one of the points A or B the...

Now Q2: Angle QCA = Angle CBA (Angle between tangent and chord) Angle RAC = Angle CBA (Similarly) Therefore Angle QCA = Angle RAC Angle QCA + Angle CAR + Angle ARQ + Angle RQC = 360 (Angle sum of quad) 2Angle CBA + 84 + 70 = 360 2Angle CBA = 206 Angle CBA = 103 Once Again please...

Ill start with Q1 AT = TB (Tangents from a point) Therefore ATB is isosceles Angle TAB = Angle ABT (Base angles of isos triangle) Angle TAB + Angle ABT = 180 - 50 (Angle sum of triangle) = 130 Therefore Angle TAB = Angle ABT = 65 Now Angle PAB + Angle...

You can email the diagram to me if you like, lost_auzzie@hotmail.com. Ill try and solve it with my own diagram in the mean time

Yeh it's 15 days, Id like it to be 16 though :D

Heheh obviously I meant week :( (edited now) Ah well put it this way, after a day of torture it would be pretty much over, 16hrs of exams, would be an interesting experience.