Chemistry

Wasn't sure whether this belonged in physics or chemistry, but being that from my familiarity with physics, heat makes objects LESS conductive, I assume it's chemistry that explains this. (And/or gives us enough to go on as to whether or not it's a hoax.) Starting at 4 minutes and 13 seconds in, you can see a tree branch that fell on two power lines conduct smolder; presumably from conducting electricity between them. However, it takes more than a minute for any flames to become visible. Within seconds of the flame becoming visible, you can hear audible electrical arc sounds for a few seconds before the tree branch outright explodes, turning the smoke given of…

So a lot of companies try to get around admitting to the sugar content of their products through special pleading. They'll refuse to count high fructose corn syrup as sugar, for instance, presumably by the fact that it's technically chemically distinct from sucrose. This raises a key question; how was sugar originally defined? Did the original definition include all things chemically counted as sugars, or just a narrower subset of them?

Water is easily the most common oxide of hydrogen. Its two hydrogen atoms for every oxygen atom correspond to the 2- charge of oxygen and 1+ for hydrogen. I would think, if only for those reasons, "hydrogen oxide" would be the most appropriate name for it. To cap it off, other covalent hydrogen compounds seemed to be named that way. H2S, for instance, isn't called "dihydrogen monosulfide." However, I always hear "dihydrogen monoxide" referred to as the name for water when people are using it to mock environmental scares. I see two explanations for this: A. They're actually that ignorant about this, which would make it seem rather hypoc…

I dont have much knowledge in chemistry but I'm trying to emulsify or dissolve Talc/mg stearate into water. I'm making effervescent tablets as a science experiment and use these as the lubricant. However they form a layer of gunk on the water surface, I'm looking for any excipients to emulsify/solublize the gunk. Thank you =)

In introductory chemistry at university I heard of an equation called the Clausius-Clapeyron equation relating vapour pressure to temperature of a substance. I vaguely recall hearing it applies to other liquids than just water. What I do not recall hearing is whether or not it applies solely to substances in their liquid phase. Does it apply to solids? Does it apply to solids dissolved in liquids? Does it apply to liquids dissolved in other liquids?

https://www.youtube.com/watch?v=y-4qqcCxD6g So the following video shows a method; involving hydroxides, silver nitrate, and ammonia, for depositing silver directly onto a surface. 1. Could any excess silver (ie. not deposited onto the surface) be re-used? 2. Could something like this (make the metal deposit onto the surface) be used with cheaper reflective materials, like aluminum? 3. How cost-effective would this be, as a mirror-making method? Does it depend on whether it's a flat mirror, concave mirror, or convex mirror? Would this be good for creating especially large concave/convex mirrors if you already had a large sur…

Hey, I have a project in my microelectronics class and trying to do research and learn more about h-BN. Are there any open source resources that I can get a full understanding of its properties? Thank you for the assist.

I live in sweden where we have a rule in the municipality that says if you have a floor well in the garage, you must have an oil separator that cleans to maximum 5 ppm of oil for discharged water. It is possible to buy ready-made oil separators with coalescer, but they are large and expensive. Since my flow only comes from melted snow from the car, it will be very low. Can I then collect the water from the floor well in a small tank, and then let it decant, and then be sure that it has separated after a certain time?

I am trying to figure out which chemicals/compounds might cause mild chemical burns in liquid form. I am not necessarily interested in things which would cause severe burns like acid; rather, I am interested in things which would give mild burns to human skin, perhaps after prolonged exposure. I was also interested, primarily, in organic chemicals which arise naturally in nature and not things which are synthesized, but I understand that might not be possible. Any help would be much appreciated. Thanks!

If it we're then adding white milk to it would make a grey drink, not a light brown one.

I used 9 V battery for water electrolysis. It shows bubbles forming. Then I connected a Multimeter to measure current. It shows a reading of 0.018 A but there are no bubbles formed at the electrodes. Any suggestions on what might be causing this?

I have water and an unknown metal. I know the masses of both, as well as the temperature changes. I know the specific heat of water, but I have to determine the specific heat of the unknown metal. There is a equation that goes as follows: q rxn = -(q soln + (C * delta T)). The q rxn would stand for heat the metal absorbed/released and q soln absorbed/released. C is (q cal / delta T). m water - 100 g m metal - 5.332 g cp water - 4.184 cp metal - n/a delta t water - 5.5 delta t metal - 23.5 I heated up the water and kept the metal at room temperature, so I think I would switch up the equation so that it goes like this: q soln = -(q …

what chemical method to determine the number of OH-groups in a sheet of paper?

Please tell me the name of that oil that has no fragrance or little bit fragrance & can dissolve in alcohol.

Hi guys, Been reading a lot of studies, and a lot of the time the measurements are done in μm. I personally want to make a topical solution of 1 μm rapamycin, how would i calculate that to mg per ml? Thanks!

Hi all, Class A burettes (50ml) have a stated tolerance of +/- 0.05ml while class B are +/- 0.1ml. What are the practical implications of this in recording measurements? Typical practice is to estimate a second decimal place which seems wrong with class B burettes which are most commonly in use in schools - a titre would be recorded as e.g. 25.55 +/- 0.1 ml. Here the number of significant digits are outside the tolerance or is the actual reading to be taken as somewhere between 25.45 and 25.65? In the case of a class A then this would be between 25.50 and 25.60. In essence, it seems wrong to record more significant digits than the tolerance allows - this wo…

ok so i have a solution of CuCl2 or copper (II) chloride (ive seen it called both) well is there a way to precipitate the copper out? or another reaction that will give me Cu metal?

Hi. As am taking blood thinner medicine and often get skin cuts; I would like to know if there is one styptic pencil preferably made without aluminium. Do you know ?

I really think I've possibly been poisoned by my own husband and probably does it every opportunity he gets. I feel he doesn't love me or cares about me anymore. As we speak I am not feeling well. Plus I know he's probably been cheating on me with other women behind my back. And my liver is hurting right now and I can't go to the bathroom.

We all know what electronegativity is: it is the ability of a chemical element to attract the bonding pair of electrons when it forms a bond with another chemical element. Electronegativity was introduced in 1936 by the German chemist Wolfgang Pauli . He gave the above definition of electronegativity . But where does it come from? Well I think i have the answer ->Radius of the element : The bigger radius of the chemical element , the less electronegativity it has because the attraction from the core of the bonding pair of electrons is reduced by distance and the atomic radius gives a good value for the distance between the core and the valence electron…

Hello, I’m new to the forum and I’m hoping to find an answer to this. After searching extensively online for a scale that will measure fractions of a milligram I am only finding scales that will weigh 1 milligram. I need to take a 2mg capsule and measure out either 1.5mg or a little more of the powder inside (1.75mg?). I need something super sensitive. I found ONE scale that will weigh micrograms but it is far outside of my budget (almost $1000). If anyone knows of a good sensitive scale for measuring powder that can measure parts of a mg I would greatly appreciate the help. Thank You!

Hello everyone, This is my first post on this forum and I would like to begin by pointing out something that most chemists already know and seem to have accepted as a matter of convention and tradition. It is something that I just cant get over and it really just rubs me the wrong way. The Standard Periodic Table is broken, with 30 Elements placed out of order and omitted from the numbering system to save paper space. The true arrangement of the Elements has been said to be, "impractical" and "too wide to easily fit on a Standard sized peice of paper". The International Union of Pure and Applied Chemistry (IUPAC) has gone back and forth with Periodic Table…

So my Quantum Chemistry PhD Thesis is 30 years old this week. Hardly anyone read or referenced it so now, for the first time ever, you can have it for free. Modify it, change some fluorines to chlorines, swap Heisenberg for Schrodinger and away you go! Emboss it for that extra sizzle! Congratulations Dr. Professor !!! Cheers! Link deleted

Anyone is welcome to post! Especially study camp qualifiers and honors/high honors recipients but that's not necessary!Hey guys! Starting a thread to discuss chemistry olympiad in the US, but others in the world feel free to discuss and give input! This past year I made it to the national round but didn't make study camp, which is the goal for this coming year. So, those of you who have made the study camp in the past, please give some input - would be highly appreciated!1. What do you guys recommend for textbooks to prepare for the national round? Most of what I've seen says Atkins for General Chem and Klein for Orgo for all knowledge needed for Parts I and II. Is that a…

In this work, fluorescein was incorporated with an equal molar of 1-chloro-4-nitrobenzene and double potassium carbonate (molar ratio), the solvent of this reaction is dimethylacetamide (50 ml for 5 g of fluorescein). The solution was stirred in at 110 °C for 24 h, after that cooled to the room temperature and precipitated in cold water, but a solid, similar to potassium carbonate, remains at the bottom of the reaction vessel, and the efficiency is very low (25%). I don't know the cause of this problem. This is the structure that I expected for first stage: In the next step the solid that was obtained from the previous stage, i…