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2 hrs !!!!! LOL why the hel would a teacher give something that long and where did the teacher find the time to listen to everyones

Yeh I had read slow and steady and got just under 1000 wrds, with a powerpoint in the background, so it depends how you speak, and speak fast but understandable. Btw for my legal speech, well it was a 20 min presentation so your lucky hahaha

I said 1000 words in just over 5 mins so aim for around that

What this question is testing is your knowledge on the basic and acidic nature of salts, as well as the equilibrium properties. To increase the concentration of the (CrO4)2-, you must remove the hydrogen ions to shift the equilibrium left. For A sodium nitrate, the sodium comes from sodium...

nah like I said there is oxygen present and water is the by product. 4C2H4+2Cl2+O2 ----> 4C2H3Cl + 2H2O

The ethylene is heated to 150 degrees celsius, with chlorine and oxygen, and in the presence of a copper chloride catalyst.

Yeh true but I recommend using the substitution method because it is useful for almost any other situation whereas the factorisation may not work sometimes, but yes you can

That's what I thought at first but you do as in the proving step, when you got big Z, you expand the same way |Z+z(k+1)| like you did when you proved for n=2 and you have to state that, and then by continuing the chain you will get the solution.

The manual labour jobs are one of the highest, and traffic control lol except that's just a bludge

sorry I don't have a pen and paper, but let z=x+iy then you substitute and simplify, then you equate the real and imaginary. Btw u can not have an imaginary as the denominator so you must rationalise.

I got an old success book but there was a mistake in a calculation or two which was really annoying and that is really frustrating, that's why if I'm not sure now I try to refer to numerous sources like the net, online board of studies, my notes and the text book.

ppm is basically the same as mg/L, where 1000 mg = 1 g. If you want to another example look here http://community.boredofstudies.org/showthread.php?t=270087, and if you still need help just say :D the answer to the question is as follows. As the curve will be linear or close to it, we can say...

Lol yep except now the only reason I look at success one answers is for some other ideas haha but it's really annoying, and especially when their calculations are worng

I reckon the best all rounder player is Messi but he is still growing and will become better lol

Lol same ^^ :D

Depends on the question type, since ppm equals to mg/L, you can then use concentration to find anything you need. Note that 1000 mg = 1 g so 1 mg = 1x10^-3 g

First re read the question, 0.9 mol of N2 has been converted, thus 3x0.9 mol of H2 has also been converted using the stoichiometry, but you are right when you said 6.9-2.7=4.2 mol of H2 remaining. Also they just substituted the values into the equilibrium constant equation, that is wrong you...

Yep sorry was doing another question at the same time and did not realise, but as long as the molar ratio and such is understandable. Thanks

Dissolved Oxygen (DO) is the amount of oxygen dissolved in the water system. It is measured in ppm as the natural waterways and systems have approximately 8 ppm. Biochemical Oxygen Demand (BOD), is the measure of the how much of the DO is used by the organisms and bacteria present in the water...

Sorry but I will start from the beginning and go through, then if there is still anything you need don't bee afraid to ask :D 2HCl_{(aq)}+Ba(OH)_{2}_{(aq)}\rightarrow 2BaCl_{2}_{(aq)}+H_{2}O_{(l)} now number of moles of HCl = 0.025x0.75= 0.01875 moles number of moles of Ba(OH)2 = 0.01x0.5=...