TSR Chemistry Society
Chemistry discussion, revision, exam and homework help.
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Re: TSR Chemistry Society(Original post by Nirgilis)
Your sig gif is too much
BOT: Had a careers talk today. Who ever knew there were so many options for a chemist
cheers me up on days like today
Care to share? I've no idea what I want to do and any career talks we get are all about forensics and what to do now the FSS has been closed -
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Re: TSR Chemistry SocietyLittle bit lot for an amide (which is the lowest of the common C=O functional groups). Could possibly be a carbonate ester/carbamate or something similar where there is lots of pi donation into the C=O pi star orbital and hence the C=O bond is weakened quite substantially. That's just a guess mind as I've never seen an IR spectrum of one of those, could be wrong. A little bit high for a C=C stretch though. Do you know what functional groups you've got in your molecule? And do you have any other peaks in that region?(Original post by VanillaTwilight)
Quick question guys.. in an IR spectrum, a peak at 1650 would that be C=O or ArC=C ??Last edited by illusionz; 25-02-2012 at 12:05. -
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Re: TSR Chemistry SocietyI eventually figure it out(Original post by illusionz)
Little bit lot for an amide (which is the lowest of the common C=O functional groups). Could possibly be a carbonate ester/carbamate or something similar where there is lots of pi donation into the C=O pi star orbital and hence the C=O bond is weakened quite substantially. That's just a guess mind as I've never seen an IR spectrum of one of those, could be wrong. A little bit high for a C=C stretch though. Do you know what functional groups you've got in your molecule? And do you have any other peaks in that region?
It was an amine, but the C=O bond was lowered due to conjugation (a bit too low, but it was the only thing that would actually fit the molecular formula!)
Thanks though
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Re: The chemistry socI introduce myself!
Name: Gregorius alias Kallisto
Hobbies: reading, art, martial art, sport (mainly martial art), natural science (physics, biology and chemistry of course)
Where you live: I live in Germany
Current Studying level: Studying for my life and an A-level at the moment!
What you are studying: natural sciences, languages and social sciences - these are my subjects.
Hero(s): Otto Hahn, because he has discovered the nuclear fission - that's interesting - and both Marie and Pierre Curie who have discovered the radioactivity! Although radioactivity is dangerous, it's an important discovery not only for Energy Production!Last edited by Kallisto; 26-02-2012 at 16:01. -
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Re: TSR Chemistry SocietyHey, quick question which hopefully someone can help with, I need to work out mole fractions from a proton NMR spectra, we've been given the integrated areas under the peaks, so I assume it's using that, but we haven't actually been taught how. Thanks
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Re: TSR Chemistry SocietyHi guys!
Quick thermo question: When dT=0, dU=0. Why is this and is there a mathematical way of proving it? Our lectures give reasons for constant volume and pressure relationships, but not constant temperature
. Many thanks! 
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Re: TSR Chemistry SocietyBoth calcium hydroxide and magnesium hydroxide are solid elements. In terms of the solubility in water, a solid element is more soluble when it has an higher temperature. Calcium hydroxide is soluble by 20 °C (I don't know at the moment what it is in Fahrenheit.) and Magnesium hydroxide is soluble by 18 °C. In related to that calcium hydroxide has a higher mass unit per volume than magnesium hydroxide - 1,7g*l^-1 compared to 9mg*l^-1. That is to say 1,7g per liter solution is soluble in water for example. Solubility increase at high mass unit per volume and decrease at low one. Do you get it?(Original post by volvicstar)
(...) explain why calcium hydroxide is more soluble in water than magnesium hydroxide?
What did you mean with your first question. I'm sorry, but I'm not an Englishman! I didn't understand you. -
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Re: TSR Chemistry SocietyWhat is C3L6 an element and your problem about that? What can I do for you?(Original post by Silverland)
anyone willing to help me out on the last C3L6 question? -
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Re: TSR Chemistry SocietyI have no idea. I think there are not so much chemist in this forum at the moment.(Original post by boromir9111)
WhY so dead?
Are you interesting in chemistry? which doctrine is your favourite? Have you any paragons in chemistry and why?Last edited by Kallisto; 08-04-2012 at 22:57. -
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Re: TSR Chemistry SocietyWhat a pitty... Is there really not a member who is VERY interesting in chemistry (not only for exams)?(Original post by Loz17)
Exams I think. Nuff said.
Is there not a member who want to talk about one? I'm bored...
. Many thanks! 
