Applied Chemistry

When copper(II)pentahydrate (CuSO4.5H2O) is heated, the deep blue color changes to the white color of the anhydrous salt (CuSO4). Why does this happen?....I know it has something to do with the splitting of d-orbitals....anyone know?

I was wondering what compounds are used to make red, amber, and green colored glass in old traffic lights. Google was no help at all. This is for an assignment due really soon, so if anyone knows, tell me.

i was thinking that if you have a more concentrated acid then there are more parts acid per part water. going by that surely a higher concentration would therefore produce more yield or end product. because there'd be more acid for the other reactant to react with... however in a recent experiment i did i found that varying concentration varies the rate of reaction, but does not vary the total yield produced... i was wondering why that is?

any investigation on household chemistry which is not that complicated but interesting!? we 've tried to investigate effect of sugar in milk under heat(millard reaction or whatsoever) , but it's rather difficult to reach the conclusion.. thinking of changing topic now.. but time is limited.. help!

I Have NO idea Any ideas.

I was wondering if anybody knew how to purify Activated Carbon in the lab. It's ash content is about 4% which i know is small but we still need to bring it down further. Dissolving in acids doesn't remove all the residue. any ideas?

How do u make kno3? Becuase im not sure how expensive it is in Australian Shops. Im only new at this kid of stuff.

if you have an exothermic reaction then heat is given out. so temperature increases... temp change is a positive value yet delta(temperature) will give you a negative number because the change in temperature, final temp value is greater than the initial temp. value, so the temperature change = initial temp - final temp = negative number. so we have: positive change for temperature negative delta(temperature) why is the change in temperature (delta) is negative whilst there is a positive change?

I am reading the book Quicksilver which has the running theme of alchemy and natural philosphy. Well, at one point someone discovers that you can get this cool stuff that glows by boiling some urine, so it gets demonstrated in the courts. Anyway, can you realy extract phosphorus from urine? If so, how? Has anyone here done it?

Hi there this is my first thread in this forum, firstly thank you all very much. one time i read about making kno3 from (manure,dirt,ashes,..etc) and i have found the way in this forum before i enjoy it, but the way was so difficult for me because the steps of it have no explain it was so simplified(too short) so of course i have too many mistakes, the thing i need from you friends to explain this way for me more and more and if you can add some pics,or something else, or to find me this way on a good website and with a good explaning and to be easy to do... i attached the file that i got from this forum in the past but it is not explain everything, you will find some…

I'm interested in the elecyro-chemical side of cold fusion. I have had a go at cold fusion using potassium carbonaye solution with copper and aluminium electodes and as the solution was heated, with 200v 0.6amps going trough, I witnessed the rapid dicintegration of the aluminium anode. Can anyone please explain

what is a disadvantage of using diffential staining (dyes to increase the speciman's contrast) in light microscopes?

In a farm land, we add ammonium sulphate to lower the alkaline of the soil. What's the reaction? Ammonia and sulphate ion and hydrogen ions? and to reduce the acidity, we add some calcium oxide, quicklime, why not add some calcium hydroxide, slaked lime?

3SnCl4 + 4Al(C2H5)3 -> 3Sn(C2H5)4 + 4AlCl3 In one experiment, 0.100L of SnCl4 (d=2.226g/mL) was treated with 0.189L of Al(C2H5)3, (d=0.835g/mL) What is the theoretical yield in this experiment (mass of Sn(C2H5)4)? please help!

Have any of you ever been in a chemistry lab or a store-room and saw something lying around that just made you go at the sight of it? It's happened to me a couple of times. High School: A half gallon of bromine in the chemical room. Yeah it was sealed and heavily wrapped, but still, a half gallon? 125 gram lump of white phosphorus. Various unlabelled chemicals of varying colors which we were never able to identify and too nervous to touch. College: Old biology closets where VERY old specimens were in jars of picric acid which had evaporated into a dangerous yellow crust. (Bomb squad had to come in and remove the jars and subsequently detonate them…

What is the definition of a displacement reaction? In aqeuous solution? Moreover, sulphur dioxide dissolve in water to give out hydrogen ions and sulphate ions? And, what is the reaction for a concentrated nitric acid reacts with a metal or a carbonates or hydrogencarbonates?

Is there a mathematical way/formula to find the number of water molecules in hydrates? If someone knows the formula, could you plz also show steps to coming to that formula. Thx alot

My chemistry master has asks me to do an experiment to find out the how to change the melting point of ice, up or down. What i need to do is write a complete report on how i intent to show that i can increase the melting point of ice by adding salt and i also need to show the sensivity eg. number of degrees melting point increased compared to the concentration change of salt. After this i have to try and get the value degrees per concentration for other salts. LiCl,KCl,MgCl,CaCl. I am guessing this with all increase the melting point. Can anybody suggest a plan for the experiment and estimate how much change in concentrations i will need to make a noticable m…

I have lots of leaves piled up under my deck, which extends from the back of my house and is elevated about 4 feet off the ground. The deck has wooden trellices from the dirt up to the floor level to enclose the empty space, and a lot of leaves have accumulated in this space. If one corner of the space under the deck is about 3 feet high with leaves, does this create a fire hazard? If so, would smoothing them out to the rest of the space, such that they were not elevated much above the ground, make it safe? Thanks in advance.

How can you find what the compound is by knowing its mass and percentage compostions. For example a sample of a compound weighs 650 mg. It contains 257 mg of carbon, 50.4 mg of hydrogen, thus leaves us with 342.6 mg of oxygen. I worked out the percentage compositions to 38.5% C, 7.75% H and and 52.8% O. How can I find what this substance is? Thanx in advance

Hi I am designing a thermodynamic process which uses a Helium/Xenon gas to drive the Turbines. I am not to familiar with Helium and its properties when put under extreme temperatures of around 800 to 1000 C. The biggest concern I have is corrosive effects of the Helium on the material used for the piping. I will be using some alloy of stainless steel to construct the pipes. The danger is if the pipes experience corrosive effects then there will be a leak and this could cause contamination of the thermodynamic (secondary loop). Any help on this would be great! Thank you. Fischhaber Go Army Branch: EN

sorry to have to ask this, If I had more time, I`de find out for myself! has anyone ever taken apparts a Ni-Cad battery before? there`s a metalic Mesh (magnetic) with plenty equaly spaced holes in it, with a cake of a brittle shiney black material coating it, that will easily crumble and fall away when the mesh is flattened. which part is the Nickel, I don`t want the cadmiuim, just the largest portion of the Nickel. the brittle stuff is magnetic too, so magnetic detection is out the window. the last time I tried this was a year or so ago, and I did get my green nickel sulphate, but for the life of me I can`t rem how any help guys? edit: btw,…

Hi, I figured I could try making some H2(g) in my kitchen. Who knows when I will need a source of hydrogen gass . I attached a couple of wires to a 9V battery (smoke detector type), and put them into a bowl of water. Nothing happened, so I disolved some salt (I guess I should have used normal NaCl for simplicity, but ended up with a mixure of 50% NaCl, 40% KCl and 10% MgSO4, some health version). Surely, bubbles started to appear. After about 10 seconds the battery was running really hot. At first sight I though it worked as planned, but I could only see bubbles from one of the wires. ??? I tried putting a lighter flame on top of the water but couldn't notic…

I`m sure most folks are aware that KNO3 is used as the most common oxidiser in Pyrotechnics (gunpower, lifting charges, fuses etc...). has anyone here explored the possibility of using Other metal Nitrates instead? I`ve recently made a small batch of Iron Nitrate Fe(NO3)3 I already have Copper Nitrate Cu(NO3)2 and plan on making Aluminium Nitrate Al(NO3)3 since it`s the NO3 part that creates the desired effect, I`m wondering if having 3 x (NO3) ions in a single molecule might be more effective than the single (NO3) in KNO3? anyone here ever experimented with these before? and does it procuce "more bang for your buck"? edit, the method I`ll use is Fi…

What are some common chemical compositions for materials used very commonly. An example would be water is [math]H_2O[/math], salt is [math]NaCl[/math]. I'm not asking things like carbon dioxide ([math]CO_2[/math]) because that's not used by the average person (besides in breathing and photosynthesis). And obviously not the ones that I said above.