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I hope the mods ban you, you're getting really annoying with these stupid threads.

\text{Describe&space;two&space;possible&space;sources&space;of&space;contamination&space;around&space;a&space;catchment&space;and&space;ways&space;of&space;reducing&space;the&space;contamination.&space;7&space;marks.&space;250-300&space;words&space;max.}

Na there are some areas which i believe i have repeated myself

Alright, lets make some sort of system which addresses marks and lines. For 7 marks how many lines y'all reckon?

Your answer has to be detailed. For 6 marks, you have to not only talk about the composition of the cell, you have to talk about collaboration, you have to talk about the chemicals which pose a threat, then you have to talk about which chemist does what, and as your talking about the chemists...

hahaha this is the worst question! Chemists need to collaborate when monitoring the environmental impact of the lead-acid cell battery to ensure the environment is safe from detrimental chemicals which could potentially kill organisms, both plants and animals. Different branches of chemistry...

YES! Sorry i confused myself with something, my notes say what you said. :D Thank you for clearing that up! New questions?

ANYTHING I WANT hahaha And some maths :p

Just remember this, halons are like chlorofluorocarbons but also contain bromine. Now, in regards to strength or the most 'dangerous' form of ozone depletion is caused by bromine followed by chlorine. Fluorine, is ozone friendly. The only part you really need to know is the definition of a...

First read this thoroughly and do everything it says if you want to ace economics. (if you haven't read it already) http://community.boredofstudies.org/22/economics/324354/state-rankers-guide-economics.html Created by Mreditor

Many papers (sample answers) only put the state for the ozone or the oxygen. I've seen it in past hsc papers as well, they're not too pedantic about the states in these equations.

I don't think they directly ask you questions about halons because all they are, are brominated haloalkanes. Halons are like any chlorofluorocarbons, they cause ozone depletion. You don't really have to know this imo, but wouldn't kill just to know what a halon is.

well ozone and oxygen is just gases so there easy to put. The rest you don't for obvious reasons.

Are you talking about these 2? O3 + UV ----> O2 + O. O. + O2 -----> O3

hahaha! I've honestly realised that this thread has been the best chemistry study. Not only are we giving weird/long questions, we are critiquing the answers we provide and improving them.

I think it's a good answer. 4/4 Give a question? I want to write an answer too -.- I am also sitting the HSC this year hahahaha

Only about a year delayed lol

New question : Discuss the advantages and disadvantages of using models in chemistry. Use examples to illustrate your answer. 6 marks

Hahaha, i slept at 2, woke up 8:30. It's not good, because i only had 4 hours sleep :[ the other 2 and a half hours were literally me not falling asleep But then for some reason i am not tired as well

rest of the paper is straightforward?