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you use the 4.18x10^3 if you want you answer to be in Kilojoules straight away, however when you use 4.18 your answer will be in Joules

yes except be careful of the significant figures, they may be picky and take marks off

first we find the moles of H+ and OH- released. n(HNO3) = 0.030 x 0.1 = 3x10^-3 moles since HNO3 ionises to produce one H+ ions per molecule, then 3x10^-3 moles of H+ are present n(Ba(OH)2) = 0.010x0.1 = 1x10^-3 moles since Ba(OH)2 ionises to produce two OH- ions per molcule, then 2x1x10^-3 =...

Ok well first find the change in heat using mc(change in temperature) = 350x4.2x77 = 113190 J therefore 113.19 KJ is required and ethanol produces 1360 KJ per mole although only half is used to heat it, so 680 KJ/mol is ethanols ability to heat the water. 113.19/680 = 0.166 moles therefore 0.166...

They are inert so I haven't heard of a noble gas oxide sorry

Aiight cool and best of luck tomorrow :D

If you look at the structure of an ester, not the small ones but a long one, do you see how the oxygens are surrounded by non-polar long hydrocarbon chains?? this is what allows it to dissolve non-polar molecules as the long chain on either side neutralises the polarity caused by the oxygen.

First find the number of moles of H+ ions and OH- ions released. using n=CxV n(HCl)= 0.020x0.08 = 1.6x10^-3 moles since HCl ionises to form one H+ per molecule then 1.6x10^-3 moles are present n(NaOH)= 0.03x0.05= 1.5x10^-3 also since NaOH produces one OH- ion per molecule then 1.5x10^-3 moles...

no it does not matter

where is this question from?? ppm is not the same as mg. mg is mass whereas ppm is the concentration so mg/L

dude seriously get over yourself, this is what they found hard or something useful they may come tomorrow, why don't you give us a "hard" chem question

This ^^ hahahahaha

Aiight well what are exapmles of both ground and airborne instruments used to measure ozone and how is it measured??

hahaha um define validity and reliability, happy lol

it has 2 normal covalent bonds then the oxygen gives 2 electrons to form a coordinate covalent bond, not sure how you want me to draw it on this and I'd say know validity and reliability well :D

Oh aiight, still 2 hrs is quite a long time and you can talk about a lot but nice work haha and isn't that economics not legal

Well Melbourne apparently has better education and facilities, but UNSW will pay you lol and you will get industry training. I would base the decision on where you live actually

Hahahahahahahahahahaha did you just copy the entire textbook onto your palm cards and read :p and to think my english teacher deducted a mark because i went 8 seconds over lol and it was his fault I went over as well

HAHAHAHAHAHAHAHA how did you keep everyone seated for 2 hrs and what did your teacher say?? lol I think my teacher would have strangled me if I did that

I applied for the actuarial one and didn't get it, and honestly didn't really want it lol