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A box has 4 geography books and 3 maths books in it. Two books are selected from random from the box. If I wanted to find the probability of say, getting 2 geography books, would that be with replacement or without in terms of the wording of the question? EDIT Oh and another one...

What exactly would we be required to know? The reactions occurring at the anode and cathode? Or something simpler like environmental issues? Would the HSC 2002 Q probably be the hardest related Q they could ask about that?

(b) A sample of hard water contains 6 × 10–4 mol L–1 of magnesium carbonate. Calculate the mass, in mg, of magnesium carbonate in 150 mL of this sample. Just wanted to know the correct answer.

This is probably really obvious but... 8) A sulfuric acid solution has a concentration of 5 × 10^−4 mol L−1. What is the pH of this solution, assuming the acid is completely ionised? (A) 3.0 (B) 3.3 (C) 3.6 (D) 4.0 I don't see why the answer is 3. Do I have to do something to the number?

What exactly occurs during this step? Is it just the monitoring of the process to ensure desired results? Or does something else happen?

Does anyone have the answers to this? I'm only asking because the answers on the site are actually answers for the Independant paper not the CSSA. I was getting pretty frustrated with the supposed answers until i realised they were for a different test.

Probably a really simple question but: When doing exponential growth and decay questions, do i round up or down? Like, say the question was asking "How many days will it take for XXX to increase to XXXX" and my answer is 14.34. Would that mean 14 days or 15? Or is my answer just wrong? Same...