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Quote from: Wreath on Today at 07:23:30 AM I may be ashamed later, but I thougt that 22,4 dm 3 is the volume of 1 mole of any gas? Only at STP, and even that doesn't have to be true as STP is not well defined... Quote so, if there is 22,4l container and 1 ATM pressure, there should be 1 mole of He exactly?  Assuming temperature of 273 K - yes.

Yes. If one of the salts forming is insoluble, it will precipitate. You just have to filter it off and evaporate water to get NaCl. For example, reactions in water: * 2NaI + PbCl 2   2NaCl + PbI 2 PbI 2 has a low solubility in water. So you filter it out and you're left with salty water (and still some traces of Pb 2 ). * Na 2 SO 4 + BiCl 2   2NaCl + BiSO 4 BiSO 4 will precipitate. * Na 2 (oxalate) + CaCl 2...

I find organic synthesis questions hard. The only reference I can find to benzanal synthesis is http://en.wikipedia.org/wiki/Gattermann-Koch_reaction which is a "type" of Friedel Crafts alkoylation of benzene where the unstable methanoyl chloride is formed in situ. I don't know from which ester you would start to end up with a methnal side chain my guess would be (working from the information here:...

anybody know? 

Quote from: The Cancer Curer on Yesterday at 09:18:26 AM Quote from: DarkLightA on Yesterday at 07:11:57 AM Is this good for me? Or is it too advanced? http://www.amazon.com/exec/obidos/ASIN/0486656225/thechemicalfo-20/104-3671508-3002355?_encoding=UTF8&camp=1789&link_code=xm2 Great book to begin with. Are you sure it won't be too hard?

The short answer is that in the beginning you have to memorize and learn things as isolated facts. Everyone does; there is no way around it. Nobody pops out of their mothers womb saying, "Oh yes, I see the electron is flipping its spin when it interacts with light. *nod nod*" Nobody. A lot of the theories are disconnected from one another at first and before you can begin to study their connections you first have to...

http://en.wikipedia.org/wiki/Biuret_reagent Copper sulfate is a quite stable solution.

Quote from: Olshia on Today at 04:22:18 AM It is movement of charged species throughout the structure, i.e. ions or electrons @Ranadeep I also mentioned the ions x) And graphite has delocalised electrons. Three e - of each C atom are bonded covalently and the last e - is free to move. About HCl or carboxylic acid, they are covalent, but they ionise when is solution, so if you have HCl (g) , then it is covalent, if HCl (aq) it is in solution,...

(sorry, I didn't answer in the order of your q's; PV = nRT can be used if you want to see how the actual change is occurring, but as Felixe noted, you can use the following short-cut; you can get the same answer by solving for n w/ the initial pressures/volumes and then plug them back in with the new volume, or do this:) a - b)  If you use P1V1 = P2V2, you can get the partial pressure of each gas in the combined...

http://www.google.com/search?q=oxygen+element&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a