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Well the question said "it will operate if at least one component works" so I'll assume parallel.

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...

I didn't refer to them specifically. I just talked about them both as a whole, compared to HCl :(

Exactly what i was trying to say.

From increasing ease: As you progress forward, it becomes easier to oxidise. So you would start from the one with lowest oxidation potential, and then go upwards. Thus, it should be D. Hope that made sense. If not, er...it's too late now anyways. No point arguing.

Heh yes her getting pwned sounds very entertaining. Get a photo and post it up! I got A as well. I don't see how it could be anything else.

Well I had A and what I assumed was: The mass of the two reactants would be the same as the two products. Thus NO2 + O2 = 0.66 + 0.72 Then I just assumed that the mass of NO2 was half of that. Then you can work out number of moles, since you have mass and molar mass (work it out) Then...

Was the answer really C? Damn my calculations were nowhere near, so i thought "Gee, I think I'll guess C. I haven't had a C in a while" Let's hope it works out!

Ah crap that doesn't sound like what I did. What was the final answer then?

I was actaully asking what happens during the propagation stage. I guess I can cut out the quality control stuff then. Damn tutor, yet again! Gesus: dimer?

Thanks Paroissien that's great. I needed the info about current research. Geez everyone's using biodegradable huh?

Damn I've never seen those before either. Thank you!

At first i thought it was some kind of yield related question but there's none of that stuff with addition polymerisation is there? I'm stumped.

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?

Answers in my marking guidelines say D. I would agree

Yes. They were saying when it exceeds that ratio.

You'll probably need more than one property.

I thought the pH adjustment occurs earlier on?

Woot got it right! (may not seem like a big achievement but I always manage to get these questions wrong >_<_ Thanks ben7. Standards package? Is this obtainable?

(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.