skwiff

Hi ,

 

I am a postgraduate student of chemistry , I want to know about chemo informatics. Can any one help me in this regard

 

thanks in Advance.....................

what like chemo theropy?

:S I really hope that doesn't happen here. The other thing you could do if the acetone etc doesn't work, is make chloroform using the haloform reaction (acetone and hypochlorite) and use that to perform the extraction.

im not making chloroform again ^^ not after i nearly knocked myself out. it smells nice tbh ^^

If you have a simple distillation set up you can get cheap DCM from DCM paint stripper... It is literally DCM mixed with a gel to make it stick to the wall lol. Its 87% here in australia, and its like $20AUD for 500g... it's obviously not going to be reagent grade after a simple distillation, but it wille be more than satisfactory for an extraction.

 

Edit: As for acetone and white spirirt, they will probably work, but will also bring through a lot of less desired compounds- that may be why wiki has the other method suggested?

DCM has been banned for use in paint strippers here in the UK (an the EU) so that opition is out of the window^^

mainly because i dont have much money to buy DCM ^^ acetone and white spirit are cheap and easier to obtain ^^ i know i can get DCM on ebay and i might do that next time i get paid ^^ but atm im running a mini trial with both white spirit and acetone using 125m of both solvent to see what woul happen

have you tried ebay?

will it be possible to extract this from black pepper using white spirit or acetone as i dont realy want to be using DCM...

sorry for the spelling mistake ^^ its ment to be piperine

if you press two peices of ice together they stick...

i saw a video on youtube about the making of hydrobromic acid, the guy used potassium bromide and sulphuric acid the set up was a beaker and over head stirrer and then a basic still. to me this seemed a bit ott because the product would require to be sepurated from the residual H2SO4

by using simple displacement chemistry one can make it using hydrochloric acid, this in theory should produce a more pure sample for the HBr can be boiled off and passed through distilled water to produce the acid.

equation:

KBr(aq) + HCl(aq) --> KCl(aq) + HBr(aq)

instead of:

KBr(aq) + H2SO4(aq) --> KSO4H + HBr

I wonder, why is gold dissolved by Aqua Regia. This is just a mix of nitric acid and hydrochloric acid. And each of these acids, by itself, won't dissolve gold. Yet together, somehow, they can. This seems strange. Is the gold affected by the chlorine, in the hydrochloric acid? If so, shouldn't the hydrochloric acid work by itself - why is the nitric acid needed - it's got no chlorine in it.

in simple terms. the HNO2 forms ions of gold but in an equalibrilum so it does not dissolve, the HCl then bonds to the gold ions to form AuCl3 and this can not reattach to the gold, then the HNO2 ionises more gold and the process continues untill the gold is dissolved

EMP is over-hyped in the press. It is fairly easy to protect against high altitude EMP (HEMP), which is basically a plane wave pulse of high amplitude..

 

I once stood in a full-scale threat-level EMP test bed, and had forgotten a cheap credit-card calculator in my shirt pocket. It was exposed to a full threat-level pulse -- with no ill effects.

 

This is not to say that EMP is no threat at all. But if a decision is made to shield from HEMP then protection is relatively easy to implement. Source region EMP is another kettle of fish entirely.

faraday cages would protect agaist EMPs, so if you have an iphone and are worried about EMPs stick it into your budgees cage at night...

Not directly, but when either one shuts down a hospital, or snarls traffic so first responders and ambulances are delayed, or other situations, there will be deaths caused by the attack.

death is not a direct result, it is abit like major flooding, those who survive the wall of water will have to contend with diseases... my point is that an EMP might indirectly cause death but it woud cause chaos and panic over vapourizing hundreds of civies

But since you are indiscriminately targeting civilians, it would fall under the same umbrella as a cyber attack that did similar things.

yes but cyber attacks do not cause death, and nethier do non nuclear EMPs

EMPs occure as a side effect of nukes, and the EMP its self is not very destructive (unless you are on life support or in a plane) so it would be caled a weapon of mass disruption, much like how biological and chemical/radiological (dirty bombs) they don't cause damage by destroying a vast area in one area nor can they change the landscape (destroy mountains) unlike the nuke blast that emmits the EMP. so a weaponized EMP would be more of an inconveanience than a threat.

I believe it should, but it would dissolve the gold much slower.

that is to be understood ^^

store it a glass reagent bottle... surely glass is more inert than HDPE to acid corrosion

electrollysis of a bromine salt using graphite electrodes

work out (or just google it) the molaraty of 38% HCl (should be about 12 or 13 moles) using the following n=m/RMM and then use this to work out the concentration C=n/V

Cyanides are not dangerous...same thing for common reagents in the lab. Do you really want 2 know REALLY dangerous materials? So toxic, that one exposure 2 them can be deadly? I will give some examples of EXTRAORDINARY toxic materials:

 

Botulinum toxin

 

Ricin

 

Abrin

 

Diphteria toxin

 

Dimethyl mercury

 

Methyl isocyanate

 

Batrachotoxin

 

Aflatoxins

 

Taipoxin

 

GF nerve agent (cyclosarin)

 

GD nerve agent (soman)

 

Dimethyl sulfate

 

Saxitoxin

 

Aconitine

 

Palytoxin

 

Maitotoxin (extremely nasty)

 

These are the chemicals of Hell, deadly as Grim Reaper's scythe

 

 

palytoxin and maitotoxin are the most toxic non-peptide based toxins in existance... but the are spat on by botutoxin

would a mix of nitric and hydrofluoric work in dissolving gold, in a matter of fact would any hydrohalide acid (obviously hydrochloric works) work?

if i was to form a solution of aqua regia using diluted acids (5 mol nitric and hydrochloric instead of 15 and 12 moles respcetifily) would it still be able to dissolve gold? the reason being is that if the acid is diluted should be some what safer than the 'pure' stuff.

sir,

anyone plz help me, its a chemical unknowen to me but know some properties,

it is a white powder, when a pinch of this white powder kept on cotton cloth,

add a drop of water, it reacts exothermically and emits flame it is light voilet

colour, plz name some of white powders with these properties, plzzzzz

try doing simple analyctical tests. like flame tests, nitrate, nitrites, oxides, halaides and so on... then put the peices together. this is the ony way i know how to identify an unknown chemical

okay thank you that sounds good. What about tree sap do know how long that stays sticky for once it is dried?

if you use a pine sap or cypress sap then the wood should be stuck together for a long time, but sap is even more brittle than super glue and epoxy 2 part

Do you know of any other materials? Preferably ones that stay Sticky for a long period of time??

super glue, 2 part epoxy resin, silicon acetate, contact adhesive, boiled down sugar...

Potassium Permanganate is easy and cheap to get here... I get it from my local photographical chemical supplier.. though that is what I actually use it for.. making B&W slides from film.

 

 

In any case, can we go back to the idea of using chlorine in a rocket? It can support combustion without any oxygen present, the different options of generating chlorine gas on the fly may be interesting too.

 

 

 

The reaction between hydrogen and chlorine gases in light might be an interesting idea to use.. the reaction occurring after it leaves the rocket.. or perhaps right at the bottom of the nozzles if you stick an LED (chemically resistant sealed etc) in there?

 

 

 

Speaking of old-timer welding. Here in Melbourne I saw welding on tram tracks at night, and they were using a chemical mixture to do it.

gas rockects are harder to store ( i am keeping the fuel in my freezer atm ^^) plus idont think i should be playing around with gasous halogens... i think i'l get some KMnO4 of KNO3 ^^

Solid fuel rockets are different. My good buddy and I once made a solid fuel rocket out of a CO2 cartridge stuffed with match-heads and using a "Jet-Ex" hobby cannon fuse. I insisted that we hunker down in a basement door stairwell and take cover after we lit the long fuse. Good thing. We launched our "rocket" from a short length of plumbing pipe to guide it and get it on its way. Our device turned into a pipe bomb. Schrapnel flew everwhere and broke a window on my house. I was digging pieces out of our home's wooden siding and from the garage wall for weeks. I told him we shouldn't just cut off the match heads without removing the cardboard inside the tips. He wouldn't listen. The cardboard clogged the nozzle and turned our rocket into a neighborhood hazard. Don't do what we did.

 

It is hard to get some chemical oxidizers but, potassium permanganate is a good one that some swimming pool suppliers sell as an anti-bacterial additive to the water, like certain chlorine containing substances. Mixing permanganate and glycerin in a small jar or test tube will produce a firework effect something like a Roman candle if you wait a few minutes for the mixture to heat up spontaneously. It is hard to imagine how you could develop this into a solid fuel rocket, however.

 

Get a good college chemistry textbook and look up oxidizers and reducers. It may even discuss how solid fuel rockets are actually made. There have been so many accidents on the launching pad that the trick will be to not kill yourself. Fooling around without much knowledge of exactly what you are doing is a good way to do just that.

 

I survived. I became an inorganic chemist. Making my own fireworks, firecrackers, rockets and the like were my first attraction to science in general, so I would not discourage you except to warn you of the danger. So, get help. See a high school chemistry teacher or a college chemistry professor who will guide you to safe ways to proceed.

 

the reason i chose margarine as the feu is because of its very high calorific content (2800 Kcal/100) but i was not to sure about which oxidizer to use so thats why i put it to the forums ^^

 

 

Aluminum is the fuel, not aluminum oxide. Aluminum oxide is often called alumina. It is quite inert. It contains oxygen, but is not considered to be an oxidizer. You can melt it in an oxy-hydrogen torch with some chromium oxide to make artificial ruby. If you used pure alumina, you would get artificial sapphire. There is a trick to this however. Mix powdered aluminum with Fe₂O₅ (magnetic ferrous ferric oxide) and you can make a sparkler type of firework. Old-timer railroad men remember when they used to weld steel rails using a mixture like this which will produce a fairly good quality molten iron. It would be only a temporary fix because it is quite brittle and not as strong as steel.