Applied Chemistry

Is there a material that expands or contracts when electricity is introduced? For example if the material is in this shape 0 then electricity is introduced it turns into this o or vice versa. Thanks in advance.

Hello, I'm a watchmaker and i have a tin ingot which i would like to smelt in a cast iron skillet and then pour into something else, but i'm not sure what materials can be used to prevent the tin from sticking. I want to use something with a flat bottom because i'm using the tin as a polishing block and i would prefer a close to flat surface right after pouring so i don't have to do too much more work to get it in a usable state, and of course, i want to be able to remove the tin from whatever i pour it into to use the flat side. I'm looking around on Amazon.com and have found a baking pan of the appropriate size with a silicone based non-stick coating, obviously inte…

I am relatively new to rocketmaking as a hobby and was wondering if there was any way of preparing rocket fuel for small miniature rockets without the use of potassium nitrate. The rockets that i make are around 4/5 inches high and weigh around 100g. The reason that I dont want to use KNO3 is that the stores that I know of that supply me with it have all slowly stopped supplying it due to bans and are forced to re-stock.One store does sell a fertilizer with soluble potassium oxide and nitrogen but thats as close as it gets to pottasium nitrate I'm hoping to use more simpler and more common household ingredients to be more independent of garden stores and pharmacies. …

Hello. In order to meet the following criteria what addition or chemical reaction to a typical polyurethane base (home depot floor coating) would you recommend please state your answer and the modifications to the physical characteristics of polyurethane your recommendation would make. Alternatively if you were to start from scratch and could make up your own product what constituents and process would you use, please be specific. thank you for your replies. 1. Improved flexibility/elasticity 2. unchanged or increased heat transfer 3. withstanding shrinkage and expansion in temperatures of 35-65 degrees Fahrenheit in humidity of 50-85 percent RH. 4. …

Is there any new breaktrough development of a material for better containment of helium in weather balloons ? Beyond mylar, with more durable containment, perhaps from nanothechnology ? Or,.... is there any new larger molecule gas, lighter than air which will not escape trough current porous materials in balloons ?

As I understand it, Calcium Hydroxide (which is a common compound in various industries) will react with Carbon Dioxide Gas to form Water and Calcium Carbonate. It seems that CaCO3 is popular in many industries and reducing CO2 levels are a necessity. So the question is, would delivering and dispersing a payload of Calcium Hydroxide be reasonable? Also am I missing anything? I feel that someone had to have come up with this idea already.

So I have a little project I've been wanting to get up for a while, but I'm not very good at chemistry. I've been looking for a chemical that will readily pick up oxygen that's pumped through it, and release it when heated (preferably below 100°C) The closest things I've been able to find are perclorates and metalic oxides... but I don't trust some of the metals due to metalic gas release which can be toxic :$ Anyone have any ideas of what could help me, or is chemistry not my friend for this?

This is just a hypothetical question, I am not planning on actually smelting any metal, at least not at the moment. I have a collection of aluminum cans that I amassed over a period of 6 months on my long walks along the forest preserve trail (along a river) and the surrounding area/neighborhood. A lot of my cans were at some point in the river and have accumulated some river sediment on the inside. Some of them were found by the side of the road and have sand and even small pebbles embedded in them. Other cans contain cigarette butts, gooey substances that resemble thick saliva, ants and other dead bugs and insects, small and assorted pieces of plastic, etc. I have …

So I know that if you provide an oxygen source fire can burn underwater, either by providing enough heat tthat the water breaks down and provides the oxygen or via some other chemical or mechanical means. However my question is more specifically, could one saturate water with enough oxygen that more traditional methods of starting a fire work, such as matches, burning paper or something along those lines? It seems like this would be possible, however the saturation may not be high enough to allow this sort of reaction.

Mods: Is this acceptable, I am not asking people how they made the stuff, where they got it etc. I'm just wondering what the most dangerous thing you think you've seen / used I saw these when we were clearing out an old cupboard in the chemistry lad last week: I think the most dangerous chemical I have ever seen was something labelled [ce]Hg(ONC)_2[/ce] and it was in the back of one of the school chemistry cupboards... I did some reasearch and this stuff is explosive. My chemistry teacher said he never knew it was there - he said it has probably been there for years, the next day the bomb squad were called up to remove the stuff... I just wish I could have seen i…

hello, i was wondering how salt melts ice, particularly NaCl. I'm curious how the bonds between the Na and Cl interact with H2O to lower the freezing temperature of the water. Also i would like to know how the enthalpy changes throughout this reaction. In my view of the process i had thought ionic compounds such as salt had relatively weak bonds thus how could it release enough energy to brake the H2O bonds? also where would the energy come from to brake the NaCl bonds? and the would be exothermic correct?

Hi, I am currently working on the chemical etching of zirconium oxide (ZrO2), but chemistry is not my specialty so a little bit of help would be really welcome =) The experiment is quite simple : I put a ZrO2 sample in a hydrofluoric acid solution (48% wt) for different times at room temperature, and I study the effect on the surface of the sample. My aim right now: knowing (theoretically) what are the reactions that can take place, what are the products that actually appear and (maybe the most important) what mass of ZrO2(s) can be dissolved in the solution My questions : what is the methodology I should follow ? Which kind of diagram should I calculate ? and is ther…

Hi there, I'm required to write a made-up expert witness report concerning any topic of interest. I want to do it on the analysis of chocolate suspected of containing a foreign substance, in this case cocaine. I at a bit lost as to how to do this exactly though, there are loads of articles about chocolate being laced with THC, arsenic etc. but no real information on how the analysis was carried out. This whole report has to be hypothetical so I dont have any spectra etc, but that doesn't both me so much, just how to go about starting analysis. I was suggested that dissolving/slurrying the chocolate in water, adding NaOH to pH=10 to make sure the alkaloids in c…

I just had a bit of accidental chemistry. I'm in a study where I'm not allowed to drink any caloric beverages. So, I'm allowed water, black coffee, zero calorie soda, etc. They also give me this stuff called Crystal Light. I decided to try to make my Sprite Zero taste better by adding some of the Crystal Light to it. That was a bad idea-instant volcano. It reminded me of the Mentos-Diet Coke reaction, so maybe it's the same thing. I don't know the active ingredients in that reaction, though. Crystal Light: citric acid, potassium citrate, maltodextrin, aspertame, magnesium oxide, <2% flavoring, acesulfame potassium, soy lecithin, red 40 Sprite Zero: carbonate…

By time stamp 1:12 on, at -----> Is that way to handle and process lithium metal 'normal' and safe in the industry ?

Hi. Is this correct ? <Polyethylene terephthalate PETE is soluble in phenol, chlorophenol, nitrobenzene and dimethyl sulphoxide> Is there others ?

Hey, I'm having a problem isolating a plant extract out of methanol. The solution is about 15% extract by mass. My institute has a rotary vacuum evaporator, however, I have been attempting to use this to no avail and no one here is especially experienced with the apparatus. I really don't know what the problem could be - here's my trouble shooting thus far: vacuum pressure on the system is 10inhg; none or very minimal leaks; water bath temp first attempted at 60C won't even evaporate off at 90C; tried different speeds of rotations; condensor is running. Yesterday it started working for a small period of time, but then I realized that the rotating flask was lo…

i was attempting to collect some gas from the reaction of 3HCl+Al>AlCl3+3H ((is this right?) it has a noxious odor so i always wear a mask but hydrogen i odorless?) but the reaction bubbled enough to blow a chunk of Al into the rubber tubing which then melted in the heat, how can i avoid this? the hole in the tube was coincedentaly the right size that escaping gas put newtons 3rd law in place and acid got sprayed everywhere

Hi. Which wood would yield better/more methanol; 'alive' freshly cut timber or 'dry' old dead wood ?

http://lnk.nu/google.co.uk/28fr Are results that come from a spectrometer such as the image above continuous? I ask because I need to find the area under a spectrum. If the data points are continuous then I would use integration, if it's discrete then I would use a summation. I've confused myself as even though a continuum of wavelengths in an interval are applied to a molecule, surely it is impossible to record the absorption at every value in a that interval.

I am facing a problem. I am trying to manufacture drainage cleaning materials. For that one of the chemicals used is Sodium hydroxide. But it absorbs moisture the moment it comes in contact with air. It absorbs moisture when i am trying to pack ii in the 50gm pouches. Can some one help me as to how to prevent this. How to prevent sodium hydroxide from absorbing moisture. I need help over this very urgently as all my raw materials are getting wasted due to this.

Is it possible to change phase of matter by compression in constant temperature??

diffusion-coefficient.docA solutionof pH1.2 was made from 2g sodium chloride (NaCl), 3.2g pepsin (800 – 2500iu mg-1)and 7ml 37wt% hydrochloric acid (HCl) was made up to 1000ml in DI water. where Fi is Faraday ‘s constant, T is the temperature in Kelvin, R a gas constant, zi is the charge number on the species, D is the diffusion coefficient, Ci is the moistureconcentration and κ is the ionic conductivity. Theconductivity of the solution was 2.4*10-4 Ω-1m-1. I wouldlike to know how to calculate the Cl ion, Na ion, H ion diffusion coefficient?

Hello SF, I have been reading about RO systems (both Industrial and residential). Please consider, that I have a solution containing only water and NaCl (means no other chemicals, pathogens, bacteria, etc.). Passing the solution through RO membranes, I am able to remove 90% of water. Now, my doubt is about the possibility of extracting the brine that did not pass through the membranes. I know the brine can be flushed out as waste. However, I would like to know what percentage of the brine will be flushed out? Suitable replies would be real help to me. Regards.

It is possible to make artificial diamonds. All you need is a pressure and the seed diamond will grow. Like all instable elements tend to turn into lead eventually, how can we manipulate gold to multiply? Is there even a scientific way to make gold? I am speaking in terms of non-profit.