Post by: Michael0007 on June 07, 2010, 06:44:29 pm
Some examples are:
molar masses of CH3 (15), CH3CH2 (29), glucose (180)
Cr3O7 2- => Cr 2+, Fe 3+ => Fe 2+
Alcohols = Cn H2n+2 O, Esters = CnH2nO2
What do you guys think is important to memorise?
Which formulas? which equations? which molar masses? which states? etc.
Post by: Souljette_93 on June 07, 2010, 06:50:28 pm
Souljette
Post by: chansthename on June 07, 2010, 06:55:59 pm
What do you guys think is important to memorise?
Which formulas? which equations? which molar masses? which states? etc.
all of the reaction pathways with hydrocarbons
and don't forget asprin and salicylic acid etc. Mr (molar masses)
Post by: crayolé on June 07, 2010, 06:59:47 pm
to kind of triple check your answers and have a gut feeling that its right
Aspirin content in tablets is always in the 300-350mg mark, nitrogen content in fertilisers is usually around 4-8%
Whats Trytophans formula? ;o
Post by: samiira on June 07, 2010, 07:12:03 pm
Post by: happyhappyland on June 07, 2010, 07:12:53 pm
Post by: mankay on June 07, 2010, 07:55:58 pm
penicillin is going to be on this years exam
What makes you think that?
Post by: VCE123456789 on June 07, 2010, 07:56:24 pm
Post by: akira88 on June 07, 2010, 07:57:30 pm
do we need to memorize the salicylic acid and aspirin structure..??It would be preferable to remember them :P
Post by: TrueTears on June 07, 2010, 08:00:24 pm
penicillin is going to be on this years examis penicillin even on the course? i vaguely rmb asking my teacher this last yr and she said we didnt need to know bout it...
Post by: iffets12345 on June 07, 2010, 08:05:52 pm
Post by: Toothpaste on June 07, 2010, 08:13:46 pm
Post by: m@tty on June 07, 2010, 08:20:37 pm
If it IS on penicillin, itll probably be on structures/functional groups. I don't think its as relevant to the course as aspirin. Like, for aspirin, we know about cycloxygenase, prostaglandins. Penicillin, all I can remember is that it is from a mould and a form of antibiotics.
What are these ? :-\
Post by: Toothpaste on June 07, 2010, 08:27:07 pm
As if you have to know them. Dw.If it IS on penicillin, itll probably be on structures/functional groups. I don't think its as relevant to the course as aspirin. Like, for aspirin, we know about cycloxygenase, prostaglandins. Penicillin, all I can remember is that it is from a mould and a form of antibiotics.
What are these ? :-\
But as a side note, COX determines what happens to arachidonic acids and usually arachidonic acids get turned into prostaglandins. PGs enhance responses to histamine and other inflammatory mediators. Aspirin just interferes with COX's and therefore prostaglandin synthesis, so it has anti-inflammatory effects.
Post by: 8039 on June 07, 2010, 08:38:12 pm
Hydrogen bonds = H-NOF
Diatomic elements = BrINClHOF
Glucose has two OH at the bottom while Galactose has OH and H
Post by: 8039 on June 07, 2010, 08:39:59 pm
What are these ? :-\
Just hormones (kinda) that go around your body giving you pain, aspirin stops them from producing hence less pain. I remember writing an essay about it, but don't remember nothing.
Post by: m@tty on June 07, 2010, 08:53:00 pm
Post by: HungTran2009 on June 07, 2010, 10:18:19 pm
CnH2n-1COOH (MUFA)
CnH2n-3COOH (PUFA)
Goes down by 2 hydrogen atoms each time...I think :/
Post by: chansthename on June 07, 2010, 10:22:42 pm
Probably a good idea to remember that chlorine, carbon, and hydrogen have different isotopes. CL 35 and 37; C-12 and 13; and H-1 and 2(deutrium). Also Bromine 79 and 81. These may be necessary knowledge when having to account for multiple parent ion peaks in mass spec.
yeah, I have looked into it and 13C is more likely to occur in nature than 2H so that is my preference if I have to decide between 2H and 13C but they should mark both as correct anyway.
Post by: HungTran2009 on June 07, 2010, 10:24:10 pm
I've come across a couple questions requiring them in prac exams.
I'm dying right now...btw :)
Post by: cindyy on June 07, 2010, 10:29:51 pm
So for Linolenic acid, the formula is C17H29COOH
A saturated compound would have 17*2 + 1 hydrogens =35
35-29=6
6/2=3
therefore 3 double bonds !!! :D
Post by: iffets12345 on June 07, 2010, 10:43:06 pm
Post by: m@tty on June 07, 2010, 10:50:29 pm
Do we have to know gas laws from last year?? (besides PV=nTR)
I've come across a couple questions requiring them in prac exams.
I'm dying right now...btw :)
You can derive them.
If mole amount and temperature are constant:
But on the right this is constant
So you can say:
Similarly, if pressure and mole are constant:
Again the right is constant so
etc.
Pretty useful. (Thanks to Mao when XLL was actually running)
Post by: 8039 on June 07, 2010, 11:46:35 pm
Best thread ever btw!