Chemistry

Hi, i am khalid from pakistan. I am member of the Royal Society of Chemistry. I am 17 yrs old and an A'levels student. Any one who wishes to share their problems in chemistry at the level mentioned would be welcomed. i must tell for Indians and American the A'levels is the F.S.C level or else the Ist year. Any one who wishes to know about the Royal Society of Chemistry which is a leading organisation in Europe for the asvancement of Chemical sciences is aslo welcome and i would appreciate the move if any 1 wants to become its member. I do wish 2 see a positive replies from u ppl. Khalid (ChemSiddiqui)

so i have this lab question to tackle and i am not too sure about the answer. I was wondering what the products are of the reaction: add water to a stest tube then add KMnO4 then add sulfuric acid MIX ALL TOGETHER and then add KI. how do i know what the products are and if there is a precipitate. my observations of this reaction were that the solutions are all clear and colourless then once mixed without the KI they r yellow. once the KI is added the solution turns and orangey brown colour. PLEASE HELP!!!

is their any way to find out to compare the chemical reactivity of two element while only using the periodic table

can u tell if a compound is organic or inorganic by just knowing the molecular formula:confused: :confused:

Hi, Does anyone know of a good composition that will generate copious amounts of smoke, and doesn't have much if a flame. It will be ignited in a sealed container with a hole from which the smoke should exit. (Will the confinement cause the mix to explode rather than deflagrate?)

Hi everyone, I'm new to chemistry and I'll be taking a course in which I know that I am going to have to memorize the numbers and symbols to the basic elements. Can anyone give me a list of just the basic elements (or most common)? I would really appreciate it. Thanks:cool: P.S. I have a list of all the known elements and their symbols, but I'm not sure which ones are the most common elements.

PHYSICS - Element 118 Debuts On the Periodic Table from Discover (January 2007) Issue. Chemists will soon have to make room on the periodic table for a new element discovered in October. Element 118, tentatively called ununoctium, is the heftiest to date - it has 118 protons and 176 neutrons, compared with 82 protons and 126 neutrons in lead - but it is also one of the shortest-lived, decaying in less than a millisecond. To whip up a batch of ununoctium, a team of Russian and American nuclear physicsts shot calcium atoms (element 20) at a target of radioactive californium (element 98) in a particle accelerator at the Joint Institue for Nuclear Research in Dubna, Russi…

http://www.uky.edu/Projects/Chemcomics/ Even if it might not be the most fun way, it looks like it for me. "I just used my pincer attack to inject you with the world's deadliest elemental poisons: lead, arsenic, krypton, chlorine, selenium, n strotium." Go Comix!

does anyone know the two chemical that are used to make foam? you mix them together and they expand like 30 times the amount?

I just had this problem given to me, we just started it and im kind of lost: How many moles of oxygen are consumbed when 96.7 moles of hydrogen sulfide gas are burned producing sulfur dioxide and wator vapor in the process? I got 145 mols of o2, but im not sure

Does anybody know exactly how dangerous ~2ml of Didecyl Dimethyl Ammonium Chloride is to human health? I recently saw this chemical is the active ingredient in Febreze Antimicrobial.

the single bond enthalpy of oxygen and sulphur are +142 and +264 respectively, why oxygen atom has a much smaller single bond enthalpy than sulphur atom ?may anyone please expalin the large difference?

How common is ionic bonding between atoms that need to gain or lose 3 or more electrons for a full valence shell?

Hey! I need some help balancing the equation: C2O4 2-(aq) + MnO4 -(aq) --> Co2 (g) + MnO2(s) in a basic solution. I am not getting it right so i need some help determining it. I can do the reduction half- reaction , but not the oxidation half-reaction. PLEASE HELP!

Hey! I have to answer this question about and unknown solution: The unknown solution could be Ag+, Ba2+, or Fe 3+.To find which cations are in the solution you add the following solutions. No precipitate is formed when NaCl or Na2So4 is added to the solution. When NaOH is added a precipitate forms. Which cations are present of the 3 mentioned above? I answered the question that the cations present are Ag+, and Fe3+ because they are more insoluble thatn Ba2+ which produces Ba(OH)2 (aq). Am I right with the explanation or totally wrong? PLEASE HELP!!!!!

I am doing a first year chemistry pre-lab and I was wondering what the net ionic equation would be for : adding solid silver nitrate to aqueous hydrochloric acid. I know it produces solid silver chloride and aqueous nitric acid. Please Help!!!!

what is the difference between N3-N (a reading on my low range ammonia tester) and TAN (Total Ammonia Nitrogen) from other ammonia testing procedures?

I just learned about the Aufbau chart, and I used it to determine the orbitals of atoms with 8 and 10 electrons. Atom with 8 Electrons: 1s2, 2s2, 2px1, 2py1, 2pz1, 3s1 Atom with 10 Electrons: 1s2, 2s2, 2px1, 2py1, 2pz1, 3s2, 3px1 Are these right??

Hello. How complex could it be to make a couple of kilos of Gd5(Si2Ge2) plus 1% in volume of Fe added ? What equipment would be needed ? Miguel

Hi, So I ran out of Iodine, and I was attempting to make myself some. I took some NaI, dissolved it in distilled water, then added H2SO4 and H2O2. Iodine was made successfully, but the issue im having is isolating the iodine, I set up my distillation apparatus, and waited for the vapors to be begin deposition.. unfortunaltey they solidified at the opening of the flask, blocking the way for any other iodine to go through. Does anyone know how to solve this issue? or a different way to do it? Thanks

Which is the rarest chemical element. I heard that it is Francium but I'm not sure.

About the drawing the lewis structure, I am puzzled with deciding whether using the dative covalent bond or the double bond. What are you guys' very first step in drawing the structure of the covalent molecules? May somebody draw the structure of chlorate ion and sulphite ion? Is the biggest, most important task in drawing lewis structure is to give the every atom an octet structure and this task cannot be achieved only when there's a noble gas atom,right? and for the structure of sulphur dioxide molecule, if there is one dative bond and one double bond instead of two double bonds, then sulphur atom can obtain ocetet structure, but in reality, why this is not the ca…

Hi, I recently purchased '99.99%' pure silver and dissolved it in 6M nitric acid. I noticed the solution has a blue/green color, indicating copper impurity. Anyone have ideas on removal of copper contamination without losing much yeild? thanks.

I have bought some pure gelatin solid, for information, gelatin is protein. My question is how big is the protein polymer? I want to know it because i plan to dissolve it in water and introduce it into HPLC ( high performance liquid chromatography). Basically, the analyte molecules introduced into the HPLC column shouldn't be too big, otherwise the molecules will stuck inside the column. But the references didn't mention how big is the analyte is consider "big" to column? The term 'big' is so abstract.

Hi, I'm having trouble making magnetite from FeCl2/FeCl3 and Sodium Hydroxide. I have a bottle of PCB etchant (FeCl3), put some in a beaker, added steel wool to reduce it to FeCl2. Then filtered, added FeCl3 and began adding NaOH. The problem is this: Iron Hydroxide is forming? I don't know how to stop that, I'm getting little Fe3O4 and lots of Iron Hydroxide. I thought it was the Etchant (impure) so I dissolved iron filings in HCl to get FeCl2. I added FeCl3.. and did the same procedure.. with the same result =( I'm not sure what to do? Any ideas on better ways of synthesizing Fe3O4 or where in can buy it (other than online of course , because i …