Chemistry

hi.. i want to know if there is a easy way to make sulfur..

here's a useful link

Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13? A) More information is needed. B) They have the same number of atoms. C) A one gram sample of carbon-13 D)* a one gram sample of carbon-12 What is the total number of protons and neutrons in a water molecule? A) 10 B) 12 C) 15 D)* 18 E) none of these Humidity is a measure of the amount of water vapor in the atmosphere. Why is humidity always very low inside your kitchen freezer? A) because the frost in the freezer absorbs this moisture B) because the kitchen freezer is most often sealed off from the atmosphere C) because it is not possible for water to be …

regarding to this topic: http://www.scienceforums.net/forum/showthread.php?t=40900 Why not over electrolysis of water? Isn't it enough hydrogen...? I didn't want to split the other topic.. so thats why I am asking here!

Hello, Is the Change in Gibbs free energy of formation in electrolysis (of water) the same as "the minimum electrical input energy" required to disassociate 1 mole of water? Thanks.

Hey guys, New on the forums I have a free house this weekend and access to a wide range of chemicals (my dad has a masters in chemistry, go figure) not least of which, pottasium permanganate. Any good, interesting reactions you would suggest? (have already tried with icing sugar ) Thanks in advance

I've been waiting to do titration with a standard solution of HCl to determine the concentration of anhydrous ammonia. Would there be a substitute I could use without a Burette for accurate readings? The one possible choice that I've figured was to manually drop the titrant from a beaker until endpoint but I'm not sure if it would be accurate enough. Does anyone know of any other possible way's to carry out titration without a Burette and being as accurate as possible to a real Burette? Thanks PS. Burette's are too expensive for me to buy at this time and the concentration of HCl is 0.15 mol/L.

I often hear that sulfuric acid is the strongest /most corrosive/dangerous of acids, followed by nitric and chloric. But they all dissociate to the same extent ( for reasonably dilute solutions), so they all have the same concentrations of H+, which in my eye was the essential characteristic of an acid. Does the counterion (SO4 2-, NO3 - , Cl -) matter too ? If so, why ? Thanks for your input, McCrunchy

I've been looking at youtube vids again and ive thought of two methods for improving this demo... 1) use icing sugar, for better surface area to volume ratio... this should speed the reaction up 2) use a conical flask instead of a beaker... this would make the carbon "snake thinner and therefore longer.... i'm not sure if this is safe, thought because if the carbon isnt soft enough it might plug up the neck and make the flask explode? perhaps it's better to use a glass measuring cylinder? what do you think? also... what happens with other carbohydrates? fructose, glucose, starch?

Hi guys, Do you know what is meant by m* on a mass spectrum. I have a mass spectrum but I don't know what is meant by " m* , 191 : 220 -> 205" which appears on the spectrum. 220 is the MW, and 205 is the strongest peak, but I don't really know what is meant by m* and 191. Can someone help me please. Thank you very much

Are the random electric field fluctuations that cause water to self-ionize considered zero-point energy? Also, does self-ionization require the same amount of energy that is normally required to convert H2O -----> H3O(+) + OH(-) which is 79.9 kJ / mol (at 25C). Thanks.

Hello- this is my first post. I'm looking for suggestions on how to get myself interested in and excited about chemistry. I'm taking my very first class in it in 2 weeks and I'm more than a little bit worried. Anything you can reccomend, like chemistry related stories, articles, artwork, books (the chemistry of hell joke in here was awesome), philosophy, recent discoveries that I can use to cultivate my interest would be sooo helpful. I have a very weak grasp of math and have always been that way. I am hoping I can turn that around. By weak I mean I never learned my multiplication tables in 3rd grade and still have to count on my fingers or write down the most…

is it that there turned into a gas and mixed up or something? Im guessing it varies for different atoms, so, lets say hydrogen. What would i need to do to get one hydrogen molecule to bond with one carbon molecule? and then, how would i make it so it was something like 3 hydrogen molecules and 2 carbons? thanks guys. sorry if this is a stupid question.

Ok,cool thanks guys. Off topic but too lazy to make another thread: How much mathmatics is needed for chemistry?\ Thanks.

Is there any simple way to calculate the pH of a weak acid in a solution if you already know the dissociation constant of the acid? I've looked it up but can only find long methods that involve factorising quadratic equations. Are these long methods the only way of getting the pH of a weak acid when you know the concentration and dissociation constant of the acid?

If the copper was not completely dry, excess water is likely to be present in THE RESIDUE. As we know, water has its own mass, it will add to the overall mass of copper, making the actual yield higher causing an increase in percentage yield. What else can i say in order to enforce my idea above. Thank You

is there not a chemical that can neutralize CO2 ? surely there must be Merged post follows: Consecutive posts mergedin the future we are planing to put CO2 under ground , what of a rupture ? is the CO2 so tightly bonded that photosynthesis is the only way to break this bonding ? what of electrolsis ? I don't get what the ultimate problem is ? is it money ?

Hello where can im buy german dark aluminium or indian blackhead powder in small mix (500 - 3 kg) thanks

how would you calculate the ksp for MnCO3 if 1.07 mg/L are required to make a saturated solution?

1) Find out why certain gases such as HCl(g) and NH2(g) should not be collected over water. Can someone please help me with this answer, I have been searching but i cannot find a very accurate answer for my homework. Any help is appreciated. Thanks

Is the heat of formation the same as the enthalpy of formation or do you define heat of formation as the "heat" change of a reaction when 1 mole of a substance is formed from its elements in their standard state.

my question is that in this scenario what would the result be? i heard that MgCl under electrolysis will produce mg(s) + cl(g) which is what i am after. i am hoping that mg(s) would then react with the water to produce hydrogen(g) and Mg(oh)2 which would react with the HCl to form MgCl + 2(H20) does this make sense or am i missing something?

Is acetone soluble in: sodium chloride sugar citric acid iodine glycine gelatin oleic acid glycerin Any help with any of them would be appreciated. Thank you very much.

Is there a way I can make self-sustaining boiling water with household chemicals?

Hi! I'm in a project where we are trying to study some properties of encapsulation of some phenolic ácids and flavones by cyclodextrins. I've found this paper: Cyclodextrins and Molecular Encapsulation. Author: Szejtli, J. Source: Encyclopedia of Nanoscience and Nanotechnology, Volume 2 , pp. 283-304(22) , but i can't access it. Could you give me a light where i can search for UV-Visible, IR, pH, Solubility data? I don´t know yet the route for the study.. :| Thank you very much! PS - Sorry my bad english! :|