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but 1+3 = 4 and 2+4= 6 so should it be the first?

Describe each of the layers of the atmosphere (4 marks)

wait sorry just to confirm, why cant you start off with 1,3-dibromo etc? How do you get the 2,4 dibromo thing?

yes omg that's what I was just looking at right now hahah. Thank gosh, cheers for that! :)

methyl is like the last thing, has the least precedence

Ohh so that's what they want in hsc right? So it doesn't matter about electronegativity of the halogens or weird stuff like that?

hmm there's a discrepancy? What logic do you use for it? Normally you wouldn't start with the methyl group :/

stop sewage and agricultural run off from percolating into the river/water body.

how would you name this compound? And what's the thought process in doing so? :)

I was in the same situation. I did dry cell but a while ago i switched to lead acid. Doesn't take long to memorise and in terms of comparison it's better too :)

n of sulphur = 1/32.07 = 0.031181789834737 =n of SO4 2- m of S04 2- = n x M = something Then mass of (sulphate/1g of fertiliser) x100 = answer

Ohh ok thanks!! :)))

pls help, what equation do we use for this?

Great, thanks! :D

hahah guys how do you draw a lead acid cell battery. Which of these is right...

Oh yeah true, AAS haha didn't even realise. Cheers :)

Awesome, thanks HPF! :D

True but if they ask a question, describe a quantitative measure of hardness then you'd needa talk about EDTA and perhaps explain it? Or we wont get asked that?

Thanks guys! Btw for the quantitative test for hardness with EDTA, how much do we need to know about it? Can someone provide some details about it? Thanks :)

not really, I've never seen it related to concentration and it's best not to incase your marker is a bitch and thinks that you're talking about concentration instead :/ Perhaps you're overcomplicating it just a bit.