Chemistry

Hi! Boron trifluoride is a nonpolar molecule due to its high symmetry even though the covalent bonds within the molecule are polar. As a result, the only type of intermolecular forces in BF3 would be the London dispersion forces. I understand that these forces are exhibited by nonpolar molecules because of the correlated movements of the electrons in interacting molecules. Because the electrons in adjacent molecules "flee" as they repel each other, electron density in a molecule becomes redistributed in proximity to another molecule and this results in the creation of a temporary dipole moment in the molecule. However, the boron atom in BF3 is still a partially positive…

There is confusion regarding to this eqn! As given, E=E°-RT/nFIn[M]/[Mⁿ+]----that's ok. But in Daniel cell the Nernst eqn for, Zn(s)|Zn2+(aq) electrode is E=E°+RT/2FIn[Zn2+]---- +ve sign has been put and the molar concentration ratio taken [Zn2+]/1.Why&How?

I was in the lab yesterday making RIPA buffer with the flu and wasn't thinking straight.....I was weighing out my solids into the same beaker: sodium fluoride, SDS and sodium dioxycholate however I had rinsed my beaker first, so the bottom was wet...which was bad news for me as when I added the sodium diocholate last the reaction released a nasty vapour and the sodium dicholate turned yellow. I'm pretty sure a little hydrofluoric acid vapour was produced in this reaction but my stand-alone chemistry years are long behind me. Can anyone enlighten me as to what reaction would have occurred?

I was asked to make a 1000ppm sulfuric acid. I have never encountered anyone asking for ppm concentration of an acid before, at least in my field. I have 1N and 12N concentrated h2so4 in stock. How do I make this?

I have been trying to figure this thing out. I saw a picture with I AM STARSTUFF written in amino acids, but the molecules themselves were represented by colored dots. I wanted to do it, but actually put the molecules onto it. However, I found that in Marvin Sketch, you could chain them together and the program would instantly do it for you. But I just want to make sure it is correct. Can anyone check this? The chain is Ile-Ala-Met-Ser-Thr-Ala-Arg-Ser-Thr-Sec-Phe-Phe I've tried, but I keep getting different answers, and it looks close to the original, but some things are extra.

We all (sooner or later) have noticed that foods relatively high in protein (especially those low in fat) are very prone to sticking to a pan, or in general to any non-specially-coated metal surface. For example really lean white fish, which is almost all protein, is one of those devils which will always want to stick. Likewise, egg whites can stick. To some extent, almost any food that doesn't have a generous amount of easy-rendering fat seems to stick, but higher protein is more sticky. To counteract this tendency, one learns to compensate by putting some kind of fat (usually oil or butter) into the pan in advance of the food. Most people seem to get the best resu…

Hey so, I have just found this forum because I wanted to express this (maybe silly and flawed) idea that I had to maybe find a way of reducing the amount of atmospheric CO2 we have, to try and help to solve the ever growing problem of climate change. I have been researching ways we could reduce atmospheric CO2, such as thermal decomposition, however this requires a temperature of about 1300 degrees C, which would probably mean using more greenhouse gases to use the process than it does removing it. An idea which I had, would be to remove the CO2 that is in the ocean. I researched this a little bit, and there is a company which does this with a product called Liqui…

Hello guys, I'm trying to find resources that explain how to properly fit XPS data, with examples if possible from a variety of materials: polymers, transition metal compounds, etc. Can anyone point me into the right direction please?. Thanks !

Has anyone ever died from accidentally swallowing a little toothpaste after brushing their teeth?

Dimethyl benzyl ammonium chloride and alkyl are the active ingredients in Lysol wipes, and I used them to wipe off my tablet, and later used hydrogen peroxide to wipe it off. I was wondering if possibly using different cleansing agents on the same object could cause adverse effects, like maybe they could react and become toxic? Please let me know if I should be concerned about this combination (I wiped it down with soap and water after, but I'm not sure that's sufficient to remove all residue) thanks!

Hi all! I am working on polishing a concrete slab. The existing slab has recent sulfuric acid stains and areas where the chemical is in high concentration. We need to clean this off the concrete completly in order to apply acrylic I need to know the safest method to do this. I have been told,use baking soda and water? This seems wrong!! Any help would be so great Thanks

I remember hearing a story when I was younger, about how court "wizards" would use science that both the peasants and their leaders were ignorant of to appear magical. The story went as follows: A crime is committed in a village under a lord's protection, and there are 3 suspects. The lord calls his court wizard and demands he find out which is guilty. The wizard takes his leave to prepare, and chooses 3 similar rocks of a porous nature. He takes one of the rocks and grinds mustard seeds with it until it is coated in mustard powder. Returning to the lord, he summons the three suspects and tells them they will be subjected to a test. They must each hold onto a ston…

http://www.scienceforums.net/topic/75161-the-mercury-plasma-ion-propulsion-engine/page-3?p=840405#entry840405 John wrote this post which included the phrase "I'd put my hand in a beaker of mercury" Aside from safety concerns - which was the original area of the comment - How easy would it be to "put my hand in a beaker of mercury" and what would the sensation be like? iirc Mercury is denser than almost every other liquid at rtp, it flows quickly but beads together - so would it be like heavy, and unyielding treacle? Dense and strange custard? Difficult to tell the difference from a beaker of water?

My hair dries easily and looks better when it's sleek and wet. I don't usually put hair gel in my hair but should I start doing so? However, if there are any, what are some of the negative results of using excessive hair gel in your hair? Am I better off in the long-run if I don't use hair gel?

It is now summer and time to slip-slop slap (at least in Australia). This means putting on sunscreen but I am worried that if I wear sunscreen and then choose to eat something I will get sunscreen on my food. If I do get some sunscreen on my food as I touch it, could I die? What is the probability? Has anyone ever died because of this? Should I just not put sunscreen on when I think I will eat after a few moments after putting it on? Also, does wearing sunscreen on your skin greatly diminish your body's ability to make vitamin D from the sun?

Hi. I'm wondering what the reaction is between KNO3(potassium nitrate or saltpetre) and sugar is. Im not in chemistry currently and would not understand any formulas but a normal non scientific answer would be nice. Like, How does it work? What is happening, What are the different ingredients for? Thanks Erik

This might be a little bit off topic, but I remember back in college we had a lot of different colored wooden spheres that had different amount of holes in them that would represent different elements. I remember black was carbon, white was oxygen, etc. And you could connect them with either wooden sticks or springs, which we used in a lot of our chemistry classes. I cannot remember what they are called. If someone knows what they are called, or even better has a link to where I can read up on them/buy them, I would be really grateful.

Please post and contribute Chemistry wallpapers here in this thread:

Please watch this video. video removed

I am renovating my house, and I am wondering if there's any material that can absorb the heat from coming through the walls and keep the temperature in the room lower than outside? Thank you in advance

Hello readers, I was just wondering that Hydrogen in di-atomic state has its capability to explode when lighted with a spark. So in that case what is the amount of Force that is exerted by the explosion of Hydrogen? Does explosion of Hydrogen produce smoke? In that case what if the explosion is to take place with a lot of Oxygen supplied? Please help me answer this and clear my doubts. Thanks in advance.

Hi! I wanna experiment using KClO4. however, I know, KClO4 is easily humid. and humid KClO4 is not fit for this experiment. so, I would try to dry KClO4. of course, I read MSDS of KClO4, but I couldn't get enough information. is it not bad drying KClO4 in the oven for 120℃? or are There other method help me and give me some information. because I'm not good at english, My explanation is not enough... sorry..

thanks Merged post follows: Consecutive posts mergedas occur in a fuel cell

After six months of having a screen protector, it fell off. Two days later, my phone fell off a table and hits the floor and now has star-like crack. Well more like half of one. It's on the side of my screen. Replacing my phone is not possible as it is not under warranty (my foresight is lacking), repairing it costs just as much of the phone itself apparently for my model, I decided to get screen crack filling resin and a new phone protector. However, most of the cracks do no go down to the touch sensor, and are only hairline cracks. They did not occur where I type or would minimally use the screen. Could I use a watch chip/scratch resin to fix the smaller cracks to …

Any help or advise would be greatly appreciated on this matter. I work for an up and coming stucco/paint company as a quality control engineer. I'm fairly new and not used to this type of work and I'm having difficulty figuring out a solution to a perplexing problem surrounding our batches . We color test and white test our batches and a majority have been failing quality control. They are turning out too blue because of the RD3 titanium we mix in to make it white. When the batch is mixed to long or theres too much water it will always turn the batch to the blue side . I was wondering aside from the obvious solutions ( have production watch the associates like a hawk) if …