Applied Chemistry

How do you dry an oil solid sample to get its dry weight without causing the oil to evaporate? Every dessication technique I've tried doesn't work....vaccuum suction or incubation in a dessicant atmosphere. It seems that the oil smothers the water droplets, preventing them from escaping. Any other old school chemistry suggestions?

Hi all! how could I induce gelation in ethanol. I mean to say are there some polymeric materials to do so? I need the information as I am trying to prepare the gel form of a topically applicable ethanol soluble drug. Help awaited... thanx for your time neeraj

Here's an explanation for how a simple battery works: I just don't understand why the electrons find it easier to combine with the hydrogen on the carbon rod. The electrons are orbiting the hydrogen atoms on the zinc rod. Why would they want to move?

Perhaps this could be in general physics, but here I go... What is the voltage generated using Aluminium and copper Carbon and magnesium Aluminium and magnesium Copper and magnesium as electrodes in 3.4% ClNa ? Where is a table that gives the values that its differential potentials determines the voltage generated ? -if that is how I remember it works- Miguel Merged post follows: Consecutive posts mergedNever mind... found it: http://www.corrosionsource.com/handbook/galv_series.htm

Methane (CH4), ammonia (NH3), water (H2O), hydrogen chloride (HCl), butane (C4H10), phosphine (PH3), oxygen (O2), carbon dioxide (CO2), ethene (C2H4), nitrogen (N2), ethyne (C2H2). And how do you know? Please someone respond in less than an hour!

This could (almost as meaningfully) be stated in reverse: "The history of the chemistry behind technology's evolution." Hello everyone! It's been along time since I've been to this forum, and my interest in the history and evolution of chemistry is still with me. Does anyone here share my interest in the evolution of chemistry? And if so, do you recommend any books that might satiate my hunger to know? To be as specific as possible, I want to know about the technologies that made chemistry possible. I think that the successful isolation of each element involved a unique technique. Although, in regards to metals like copper, gold, silver and the like…

Given the summer time I've always wondered if there were any substances that would help in combating heat and humidity without using airconditioners and electrical appliances. I was looking at a chemical approach. Is there something I can make that is first cheap or moderately cheap that would take away (absorb) humidity? and is there any safe reaction I could do that would have a decent endothermic reaction that would effectively cool down a small room?' I think if there was I it would be well know, but I figure I would give it a shot. Any help would be cool. ( that pun is for phi)

I realize that this number is the amount of atoms in a mole. But does anyone have any idea how that figured that out way back in the 1800's?

im not entirely sure if this is the right place it. but here a question that i, or anyone else i know can answer. so maybe your collective minds can help me out. Nitrogen dioxide NO2 decomposes when heated according to the equilibrium 2NO2 <--> 2NO + O2 for which K = 9.0 @ 910 degrees Celsius analysis of a mixture of NO2, NO and O2 at 410 degrees C shows the concentrations of these species to be 2mol, 1mol and 2mol respectively. a)is this an equilibrium mixture? b) if the mixture is not an equlibrium mixture, which reaction - forward or reverse- will be favoured as the system moves to equilibrium. that is word for word, there is no more inf…

According to the first two images of this wikipedia article http://en.wikipedia.org/wiki/Crookes_tube the anode of the crookes tube is situated ahead of the metal cross. Why do the electrons, which come out of the cathode, continue toward the cross to form an image behind it instead of heading straight for the +ve anode? Merged post follows: Consecutive posts merged29 views and no replies... Doesn't anyone know?

Ive recentley made a spud gun. I use a good flammable propellant, but i need an easy to make ignition system. Without using piezos or BBQ ignitors, or sparkplugs, can anybody help me by telling me how to make an alternative ignition system. Im only 13. Please help...:flame:

To plate precious metals (excluding silver) does it just take a pyrex pan, 2 clamps, wire for clamps, power source object to be plated, distilled water and the metal anode?

I bet most of you know what a Non-Newtonian fluid is but for those who don't, a Non-Newtonian fluid is something that acts like a solid under pressure but other wise acts as a liquid. Here is one simple way to make a Non-Newtonian fluid: 2 parts corn starch 1 part water The thing is, that with this set of materials the product ends up being milky white in hue. My question is if any one knows how to make a see thru/translucent Non-Newtonian fluid? I would like to be able to make look as water-like as possible:cool:

Hi. Trying to find out if by mixing a few not-fancy compounds, a thick ink can be made, like the ones used in ballpoint pens. Remember those high school experiments that produce colored solutions... Can they be made in a viscous form? How are ballpoint inks made?

So I'm a chemistry major, and I do great in school - but it occurred to me recently that I rarely use my knowledge in any practical way in my real life. I used to buy a pretty expensive formulation of niacinamide gel for my acne... I decided to try to make it on my own from the much cheaper capsules you can buy at Walmart. I just want to see if this makes sense. I know niacinamide (vitamin B3) is very water soluble, and heat stable, and non-toxic. The capsules I bought have "whole rice concentrate" as a filler, which is apparently rice bran and germ. If i dissolve the contents of the capsules in hot water and then run it through filter paper to remove the filler, I sh…

Hello. I was just wondering if any of you guys would be cool enough to tell me or give me some links to how to read what diagrams like the one below are called, and what the different bonding signs mean. Im kind of new to chemistry, but i crave to learn some. thanks.

hi i'm seeking to know how i can make ethylalcohol gel want to find how to make some small cash aside have gone as far as mixing ethanol with calcium acetate but the gel did not form i'm looking at making big quantities (and quality) please.

Standard enthalpy of formation: Species Enthalpy (kJ/Mol) Br(g) 111.9 Br2 (l) 0 Br2 (g) 30.9 What is the standard enthalpy of vaporization of bromine? What is the energy neede for the reaction Br2 (g) ---> 2Br (g), i.e. the Br -Br bond energy?

What is the standard entropy change for the each of the following reactions at 25 degrees C? a. 2 Na(s) + 2H20 (l) ----> 2NaOH (aq) + H2 (g) b. NaCO3 (s) + @HCl (aq) ----> 2NaCl (aq) + H20 (l) + CO2 (g) Comment on the sign of: delta r S degrees (sorry, don't know how to represent it?)

I'm trying to make a piece of home-made jewelry, unfortunately it's been a few years since I last took a chemistry course (or did anything chemistry-related for that matter). My goal is to electroplate some silver writing onto a copper ring I have. I was wondering: - What is the easiest, cheapest way to get some silver nitrate, and how much would I need to plate something that has ~1cm squared surface area? - Does oxidized copper electroplate as well as pure copper? i.e. would I be able to oxidize the ring, carve something through the oxidation, electroplate the desired area with silver, then sand off the oxidation? Thanks.

hello i am on a foundation year for mechanical engineering and have been given an assignment on plastic bonded explosives. My piece is on the microstructure/ sensitivity. I have looked all over google searching using loads of titles trying to get something usefull on this. 90% of it is either way too complicated or you have to pay and register to a site. Can somebody please give me a link to a site that is the basics of the microstructure and explains the varying volume fraction varys the sensitivity cheers tom

I have an interesting experiment going on right now. I'm trying to learn how to test ores for their mineral content. I found a recipie for SSN (saturated salt and nitric acid). I've used this to leach the ore from two locations. I tested two samples from the first location. One is just the ore in the vein, this turned yellow quickly then turned a darker orange color as time went on. The second sample from this location was out of a pocket of pyrite. We concentrated this down to the heavyist pieces (which where also the darkest) and used just a small amount of this for the second test. This one fizzed wildly for a couple hours and made the glass warm, it also ended up the …

Hey there, I'm investigating the decomposition of hydrogen peroxide and, after attempting to write the plan up, realised I have quite a lot of questions. ^^; 1. How are gases that spontaneously decompose stored? (stupid question I know) 2. I'm expected to investigate the use of inhibitors and buffer solutions, but beyond simply using them then not using them, how would I get a large range of data? Is it possible in this case to use varying amounts? 3. I'm meant to be using yeast as a catalyst, I know it's not used up in the process but I'm still not sure how much of the solution I should be using in comparison with the amount of hydrogen peroxide. Any suggestions? …

I was wondering if iron(III) chloride will substitute the iron oxide used in thermite, if so could i produce it with sodium hypochlorite bleach?I have aluminium powder already so it wont be a problem. My idea here is to oxidise a package of steel wool with bleach, allow the iron(III) chloride to precipitate drain off the excess bleach, and rinse the precipitate a few times.

Yesterday, since I'm teaching electrochemistry at the moment, I decided to try to replicate THIS experiment. I had some pure lead sheets, which I tore up to make electrodes. It worked beautifully, and I had none of the troubles with the strange material from the anode, which to me suggests that Woelen's hypothesis that the material is to do with the impurities in his electrodes is correct. I'll take some photos one day perhaps maybe.