Applied Chemistry

i want to get rid of disgusting cockroach. there are some small cockroaches appearing in my kitchen, undoubtedly, mother cockroach laid some eggs ..... insect spray is not the only way to dispose of them. i want to try boric acid solution to mop the floor, the worry is does boric acid corrode ceramic tile and laminated floor ? (alkali was once used to mop the ceramic tile, unfortunately the tile was damaged. ) thanks in advance

Is there a standard, commonly used measurement for the rate of absorption for hygroscopic solids and liquids?. I'm looking for a comparison of the hygroscopicity of various substances such as: Calcium nitrate Potassium Hydroxide Ethanol Sulfuric acid Eg, if I have 1L of Ethanol, with a given surface area exposed, for a given temperature and humidity, can I calculate a quantity of water absorbed per unit of time? How would I compare the rate of water absorption between KOH and NaCl?

Some compounds decompose before they melt. Distillation can also be more efficient at low pressure, where the liquid doesn't exist. So here's a sublimation distillator - on the paper at least. A rotating cylinder with compartments lets the powder fall through the vapour, aided by paddles or buckets, as preferred to a shaker or a gas jet. Heating at one end and cooling at the other establishes a temperature gradient. The rotation axis is adjustably tilted over the horizontal, so the powder overflows through holes from a compartment to the next warmer one. The holes are small enough that the vapour flows gently towards the colder compartments, and the shape of their e…

Bought 2 different distillation kits...non-pyrex. After about a dozen distillations, the distilling flask cracked. Bought a different one...flask cracked again. Broke down, and saved up. Bought a pyrex distillation kit, much more expensive. Has lasted me well over 2 dozen distillations! Pyrex, only pyrex.

I'm planning to conduct experiments in tire pyrolysis to produce small particle carbon for use in other projects. I'd like to hear ideas for the best, cost-effective catalysts to use in the experiments. The plan calls for using various, phased pressure and heat levels. Thanks in advance!

Hi I'm not sure if this is the right place, but... I am a the editor of Urethanes Technology International and UTECH-polyurethane.com and i would dearly like to know why we use some gases as blowing agents in rigid polyurethane formulations. I understand that they help to make bubbles of the right shape and size. My question is why are materials such as CFCs, HCFCs and now HFOs insulating gases? I guess there could be big dipoles within a smallish fluorinated molecule, but how would that make the gases insulating? Is there some kind of inter molecular attraction in the gas? Any help would be appreciated. Best wishes Simon

I need the answer for this issue because i cannot find it on internet, if this is possible or not. Or the difference between a neutral atom and one that is ionized, about the heating and freezing. The importance is when it should not or there is a difference, then we could ionize oxygen atoms and prevent them from freezing, that would be nice for splitting molecules. When they should freeze, you would say that + and - frozen atoms will attract themselves like a magnet...

Hello nice people! Fractional distillation is accomplished by varied apparatus: http://en.wikipedia.org/wiki/Fractional_distillation http://en.wikipedia.org/wiki/Spinning_cone http://www.solvent--recycling.com/spinning_band_packed_column.html but I haven't seen precisely the one I imagine: The rotating disks expose a good area of liquid film for evaporation and condensation, while the pools are separated excepted for narrow pipes that avoid diffusion. This permits one temperature per pool and disk, and hundreds of disks are feasible. Thanks to the good stage separation at the liquid and the vapour, the theoretical separation efficiency must be attained - which c…

Good day Everyone. I have made a solution which have following components (mmol.dm-3), (NH4)2HPO4 1.1 mmol/dm3 (NH4)2SO4 1.2 mmol/dm3 CaSO4 2.1 mmol/dm3 MgSO4.7H2O 2.3 mmol/dm3 Sodium lactate 1.4 mmol/dm3 NaCl 100 mmol/dm3 What will be the ratio of Chloride ions to sum of all other anions in this soltuion (Cl-:all other anions)?

Let's say I have an amount of silicon dust in the bottom of a jar of water. What are some good uses for silicon that I could try with household supplies; And with this element could I create silicone?

Hi Guys, I am currently on the verge of submitting my Master's research proposal to my Supervisor. Although i have several Research ideas on the table, i am particularly fascinated by the field of Ecotoxicology in Analytical Chemistry. As part of the research proposal, i need to construct an Artificial Ecosystem which i can use to model what exactly happens in the real in situ environment. Please give me advice on how to construct such models. Youtube didn't help. Thanks

Hey, We've just had our first baby and unfortunately my wife was diagnosed with epilepsy and needs to take a certain drug named Levetiracetam. The drug is passed to human milk and its safety for babies is still under debate. I think that in 2015, there must be a way to filter out the drug from human milk - and I want to devote myself to it. I'll be happy to get some thoughts and starting points on how do you see this filteration possible (I have an MSc). Thanks!

What does it mean for a potentiastat to apply a negative voltage between the reference and the working electrode? I know the voltage is changed by current injection at the counter electrode. Please explain

What exactly is exchange current density when it comes to electrocatalysts? Is it favorable in electrocatalysis?

Can someone please explain to me the concept of overpotential? And also what does it mean in relation with electrocatalysts? Thx

hi, I'm going to make nitrocellulose using 5g cotton, 50g KNO3 and 80ml H2SO4. Will these quantities work? I'll do it outside. Do I have use a cooling bath when it's 5°C outside?

I had this high school project and my experiment involves using coconut water as a culture medium. what perplex me is that when i add agar-agar to coconut water the volume increase?! -what i do know from what my chemistry teacher told us is that when you add more mass it won't increase the volume but the density will increase In my experiment, i had to make a ratio for the right mix not too soft and not to hard the manufacturer's instructions said mix 90 g of agar-agar into 400 ml of water Hench to make 1000 ml media i use a basic ratio and portion formula M1/V1 = M2/V2 90g/ 400ml X n/1000ml (90 g X 1000 ml) / 400 ml = 225 g thus i ad…

From my grandpa era tricks; when the windshield wipers stopped working, rubbing a split potato onto the glass allowed to see very well until those old vacuum motors/hoses get fixed. And it works great. What is in that juice? Some surfactant ? Never tried as defogger for my scuba mask. Would it work ?

Hi. Disemboweled a defunct CO detector (not a smoke detector) to find out what the sensor would be like. And got There is a cylinder the size of a fat AA cell. has only one ~0.1 mm hole behind a tightly packed dessicant sachet blocking it. Seems filled with liquid. The incomprehensible part is how can CO easily enter such tiny and blocked orifice promptly to signal the alarm, in still air... By searching, seems it is a Pasted from the web : "Electrochemical Carbon Monoxide DetectorsThis is an electrochemical cell that is designed to produce current in relation to the amount of carbon monoxide present in the air. Carbon monoxide is oxidized to carbon dioxid…

I don't think I could solve this back when I was good at it. What would be expected to precipitate from water saturated in carbon dioxide, calcium carbonate and gypsum including a substantial amount of sodium decahydrate and some sodium bicarbonate and sodium chloride as the pressure decreases and the temperature increases? There are several more exotic compouns in trace quantities. I suppose the question really boils down to what is the proportion of gypsum to calciuum carbonate in carbonic acid? Thanks very much in advance for any help.

I have recently started a new project as a process engineer working with solvent recyclers. We are looking to optimize our solvent recovery per hour. We are a high volume company and looking to recover thousands of liters of ethanol a day. The boiling point of ethanol is 79 C. Under vacuum (28 inHg) it drops to around 34 C. We add 50 degrees Celsius to the boiling point of the solvent in order to maintain boiling throughout the solvent. For ethanol, in normal atmosphere, we would use a temp of 130 C. Under vacuum it should be a temp of around 85 C. What I've found is, despite the vacuum, I need to maintain the temp around 130 C to get the same distillation rate…

Hi All, I am trying to employ FT-IR (ATR) for comparing the real composition against the theoretical composition of a copolymer series. I have synthesized the homopolymers of monomers X and Z and then the copolymers at different theoretical composition (5, 10, 25 and 50 mol% of monomer Z) of both monomers. Then I got the spectra of all samples employing the ATR technique and identified the following peaks: - (1461cm-1) present in all samples/spectra's, which I have used as an internal reference. - (985cm-1) present in spectra of homopolymer X and the copolymers. I have assigned it as a characteristic peak from the monomer X. - (1104cm-1) present in spectra of homopolym…

Hi, I'm a senior high school student doing a project on pesticides in produce and would appreciate it if someone could explain to me the general basics of Liquid Chromatography Mass Spectrometry (LC-MS) and how it can be applied to detect pesticides in produce. Thanks!

You can nitrate the sugar molecules from cellulose to make nitrocellulose. Can you also nitrate mono and disaccharides?

Hello all Probably the wrong type of thread, sorry did not know where to put it. I wanted to know if I could clean my remotes safely with Nail polish remover and whether it conducted electricity or not. Being a bit sad, I connected a battery and bulb with a small amount of nail polish remover in the circuit, yet it would not conduct electricity. Does this mean that if some got into the remote, it could ruin it? It is Ethyl Acetate, although it says that Aqua is in it as well. Alan