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#99151 What are you listening to?

Posted by BuckminsterFullerene on 04 June 2007 - 02:38 AM in General Chat

Sufjan Stevens - Chicago



#99079 What are you listening to?

Posted by BuckminsterFullerene on 01 June 2007 - 02:21 PM in General Chat

Procol Harem - A Whiter Shade of Pale



#99025 What's On Your Mind

Posted by BuckminsterFullerene on 31 May 2007 - 03:28 PM in General Chat

Not only Maldeleine, but every other missing person, Otherwise, Biology and English which are asphyxiating my cerebrum.



#99023 Big Brother 2007

Posted by BuckminsterFullerene on 31 May 2007 - 03:23 PM in General Chat

They'll send in a homosexual guy first.



#99022 Chemical Engineering at Aberdeen

Posted by BuckminsterFullerene on 31 May 2007 - 03:21 PM in Course Choices

From what I hear, It is some tough shit!



#99006 Big Brother 2007

Posted by BuckminsterFullerene on 31 May 2007 - 12:53 AM in General Chat

All idiots, bar the old ones.



#98948 Chemical Engineering at Aberdeen

Posted by BuckminsterFullerene on 30 May 2007 - 08:57 AM in Course Choices

Chem Eng yes, though not at Aberdeen



#98944 helpppp

Posted by BuckminsterFullerene on 30 May 2007 - 06:02 AM in Chemistry

Yes, to show you've done it, though it would be pretty self explanatory if you had marked out your answers laugh.gif It shouldn't matter, though I you are really worried try contacting the SQA or something. I get paranoid that I haven't marked out my multiple choice answers correctly all the time as well.



#98941 Answers to 2007 Higher Chemistry

Posted by BuckminsterFullerene on 30 May 2007 - 05:42 AM in Chemistry

QUOTE(Kiltox @ May 30 2007, 12:37 AM) View Post
Think I've lost more marks in the multiple choice than in the rest but nothing too major so should hopefully do well biggrin.gif Thanks for that, though I'm not gonna look into it in too much detail, will no doubt cause paranoia.

I think you've made a mistake on one of the MC questions though, the one that asks you to compare sodium hydroxide to ammonia.

Surely NaOH has a higher pH as well as a higher conductivity since it's a strong base and the other is weak? smile.gif


Yes surely, I'm sure it was higher PH and higher Conductivity, anyhow 90% minimum. laugh.gif



#98908 Exam Post Mortem

Posted by BuckminsterFullerene on 29 May 2007 - 07:08 PM in Chemistry

No, wasn't too bad anyway. Is it just me or do these exam papers seem to change colour in accordance to variable light intensities?



#98906 Post Your Picture

Posted by BuckminsterFullerene on 29 May 2007 - 06:50 PM in General Chat

should be in my profile somewhere



#98905 What's On Your Mind

Posted by BuckminsterFullerene on 29 May 2007 - 06:42 PM in General Chat

Biology and English, they better not screw me over. mellow.gif



#98904 Exam Post Mortem

Posted by BuckminsterFullerene on 29 May 2007 - 06:41 PM in Chemistry

What I found annoying was that the data booklet was of a different format to the ones I'm accustomed to using blink.gif



#98880 Exam Post Mortem

Posted by BuckminsterFullerene on 29 May 2007 - 02:45 PM in Chemistry

QUOTE(celticfcz @ May 29 2007, 03:39 PM) View Post
QUOTE(xClairex @ May 29 2007, 03:34 PM) View Post
overall i think it was a fair paper.

section A was a bit annoying as i could get it between at least 2 it was choosing between them that was the hard bit lol

section B most of the questions were fair there was a few parts that i was unsure on hopefully done enough to get a decent pass smile.gif


totally agree with you there - i also managed to usually get them down to 2 then had to guess!
for the first question it asked about a halide and transition - wasnt there 2 of them? probably something else you do but i just couldnt figure out what!


There was two of those but one of them ended in Ite instead of Ide, and that was wrong.



#98724 help please, excess, and % yeild

Posted by BuckminsterFullerene on 28 May 2007 - 01:52 PM in Chemistry

I can't be arsed though I'll still help!

You must compare the relative formula masses of both the reactant you are considering and the product who's yield you are approximating.

Hence 3H2 ---> 2NH3
GFM's 6 ---> 34
Have, 200 ---> x (You need to know what this will give you according to the previous ratio)

so x = 34 x 200 all divided by 6
so x = 1133 and this is what you should be getting when you use 200kg of Hydrogen

Though this is only theoretical and you actually get 650

so Percentage yield = 650/1133 x 100 = 57.36%



#98720 Quantitive elctrolysis question - help!

Posted by BuckminsterFullerene on 28 May 2007 - 01:34 PM in Chemistry

Firstly, use Q=It and you should get 960 C

Now, set out corresponding ratio's so you get

0.32g --- 63.5g (1 MOLE)
960 C --- x Coulombs (Unknown)

Now you should get that x = 63.5 X 960 all divided by 0.32

After such you should be getting 190500 C, this is the number of coulombs per mole, so you divide this by 1 F (96500) and should get roughly 2, so you you have two moles of electrons and It is therefore Cu2+



#98719 help please, excess, and % yeild

Posted by BuckminsterFullerene on 28 May 2007 - 01:26 PM in Chemistry

Hi Laura,
Well firstly in any excess calculation you must tabulate respective numbers of moles in each reactant.

Firstly, Silver Nitrate.

Divide its mass by its Relative Formula Mass, so 0.2/169.9 and you get 0.0011

Next reactant, Hydrochloric acid, Number of moles = Concentration x Volume
= 0.001 x 0.02 (volume in litres) = 0.00002

Now, you must look at the Reactant Ratio, just now there are no numbers preceeding each chemical formula hence, the incumbent ratio is 1:1
so
You have 0.0011 and 0.00002 and both need to react in a one to one ratio, so you only need 0.00002 moles of Silver Nitrate, so it is in excess.



#98610 Multiple choice Q4 2001

Posted by BuckminsterFullerene on 27 May 2007 - 05:02 PM in Chemistry

Here to help

Well

You Have;

NaBr and Na2SO4

The question tells you that you have 2 moles of Bromide ions, hence NaBr means that you also have 2 moles of Sodium in NaBr

Then

You have a total of 5 moles of sodium, so 5-2=3, 3 sodiums left for the sodium sulphate

then

(Na)2SO4
so
(Na)2 has 3 moles, so the sulphate must have 1.5



#98608 Quick Question On Acids

Posted by BuckminsterFullerene on 27 May 2007 - 04:44 PM in Chemistry

I myself find such ambiguous, but would assume stuff like 1mol/l or above would be considered strong, seen many of those types in MChoice papers.



#98603 This years chemistry paper going to be harder than last year?

Posted by BuckminsterFullerene on 27 May 2007 - 04:27 PM in Chemistry

I haven't done last years paper, would like to though!



#98599 Calculations

Posted by BuckminsterFullerene on 27 May 2007 - 04:11 PM in Chemistry

PVC, not sure, though I think its just an adopted synonym for N = cv calculations?



#98597 Calculations

Posted by BuckminsterFullerene on 27 May 2007 - 03:52 PM in Chemistry

Just remember n = cv (Number of moles = Concentration x Volume)



#98595 Calculations

Posted by BuckminsterFullerene on 27 May 2007 - 03:40 PM in Chemistry

Excess
Enthalpy changes; enthalpy of combustion, solution, neutralisation
Basic neutralisation ones
Volumetric Titrations
Hess's Law
Half Life
Quantitative Electrolysis
Percentage Yield



#98594 Calculations

Posted by BuckminsterFullerene on 27 May 2007 - 03:39 PM in Chemistry

Eh? what?



#98591 Quick enthalpy question

Posted by BuckminsterFullerene on 27 May 2007 - 03:28 PM in Chemistry

Because there is a regular increase in CH2 homologous units in each successive step