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H2O + e- <-> 1/2 H2 + OH- -0.83V Use this when water is getting reduced and nothing else 1/2 O2 + H2O + 2e- <-> 2OH- 0.40V Use this when the environment of the reaction contains oxygen eg. A wet iron plate left on the beach. Since oxygen exists in the atmosphere, then we use equation 2 (RUST)...

I don't want to give you too much... but I'd like to send you in the right direction Firstly, write down the balanced chemical equation: 2KI (aq) +Pb(NO3)2 (aq) -> PbI2 (s) + 2KNO3 (aq) Read the question and identify the aim: finding the concentration of EXCESS LEAD IONS (Pb2+) Now you ask...

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So you can plug it into your trig identity - (sinx)^2 + (cosx)^2 = 1

HSC is rote-fest but there will be concepts that are really difficult to understand.. In terms of content, HSC is easier In terms of questions/tests, HSC is harder (I don't think you can get away with everything memorized unless you can apply it correctly and logically) This is my opinion

"A focal chord is a line segment that passes through the focus of a parabola and has its endpoints on the parabola."

Silly mistakes.. possibly the most feared obstacles to be overcome by everyone I believe the main cause of this is lack of focus. You might be doing the tests too quickly (as others have said), and the quicker you do them, the lesser focus you have on the small details. To remedy this problem...

Wolfram alpha, if you just want the ANSWERS (but there are solutions)

Please

LOOOL

\int \frac{dx}{(2x+5)^4} = \int (2x+5)^{-4}dx = \frac{(2x+5)^{-4+1}}{(2)(-4+1)} +C = -\frac{1}{6}\cdot \frac{1}{(2x+5)^3} +C

For (ii), draw a diagram and see if you can use the definition of ellipses (ratio of something on something = e) Hey, they chose T such that it lies on the x-axis so must P and Q be vertical? If so, you can find point P easily by subbing in x = ae (the focus) In the end, distance formula was...

Beautiful

Matrix after Gaussian Elimination: http://snag.gy/jVmfx.jpg (scroll all the way down, line (5) and pretend there is a line separating columns 2 and 3) For this matrix to have a unique solution (Because if m^2 /3 + 2m +5/3 = 0, you won't be able to solve for z and so no unique sol'n for z) m^2...

I made a mistake while reducing the matrix down into row-echelon form.. I'll assume that you did it, could you please tell me the last row the matrix? Or entries 3,3 and 3,4?

I will Gauss it up

Yeh yeh yeh... I honestly had in mind that iron rusts faster than steel because steel is an alloy of iron What I was thinking while I typed up this post was: Which one is more corrosion resistant lol xD

Hm.. it might depend on the medium I'd say steel because it's an alloy of iron Here is something to cogitate about: Does pure iron rust faster than impure iron? Explain your reasoning

Bump, nothing will stand in your way with Vivian aside you!

It is extremely hard. If that teacher was perceptive enough, he/she could have detected a bullshit tick. Well... for all of my tutors, I see that their tick have a unique style to it which MAY need practice to emulate. So to completely emulate a person's tick, you must exert the same amount of...