Chemical Definition and 1000 Threads

So basically, instead of using large complex pumped lasers, we use chemical lasers that have insane power output. They are used to fuse a fusion pellet. The excess energy is collected and part of it is used to prepare the next batch of chemicals needed to run the laser. What would be the...

i am looking for a chemical compound that has a boiling or condensation temperature between 10C and 50C at standard pressure and is not one prohibited for discussion in the Physics Forum or any online chemical forums. something that is organic and not very toxic is preferred. it should be...

Hello, I'm just out of grad school working now as a chemical engineer, though the problems I've been asked to solve are quite varied in nature. I've known about and have used physics forums for a while, and just got around to making an account. I hope to learn a lot from here.

Hello! I am currently a chemical engineering major. I love all of my class but I am struggling in Physics

Hi there, Thank you for welcoming into your community. I completed a five year electrical control engineering college, then studied chemical engineering followed by a PhD in analytical chemistry. Since the last seven years I work in a role that involves chemical engineering and process...

What type of chemical and physical transformation occurs in the blue sphere silica gel when it is subjected to very high temperatures above the temperature supported by it for several minutes? does it turn into a compound that will absorb and store moisture and water inside and can leak if it...

Hello everyone, I am looking for a material with the following characteristics: - It must be machinable - be as thermally insulating as possible, and resistant to a temperature of at least 100°C - transparent to near-infrared light (~1µm wavelength) - relatively resistant to deformation, for...

Are physical atoms really arranged in hexagon patterns, or is that some sort of way to represent them for illustrations in textbooks and in science articles? (i.e. atoms aren't actually arranged in any hexagon pattern)

I want to build a mini chemical cabinet to try to eliminate odors in my garage as my wife thinks the car interior now smells. The chemical resistant rubber strip sealant is crazy expensive, but as the intended use will just be fumes with no actual chemical or fuel contact to the seals, can I use...

I am trying to find out it's name.Please help me

Hi Unfortunately, I can't get on with the following task. The system looks like this it is divided in such a way that the same number of particles is present in each ##\epsilon## section. I am now to determine the energy ##E(P_h,V_h,N)## at the height h using the energy ##h=0## i.e...

I recently had to do some IR specs of some inorganic compounds (technically organometallic), and I found the literature for inorganic bonds lacking, like the wavenumber of metal-oxygen, metal-carbon bonds etc. Is there a data book on this?

Hello we learned about the chemical equilibrium and how to write it's formula in the case of liquid and gaseous phase , what about a reaction involving different phases ? like this one : how do we write the formula for the chemical equilibrium ? do we just ignore the carbon ,is there any rules...

Hello i am trying to solve a problem set about chemical equilibrium , the issue is that my results don't correspond to the correction . can someone tell me what is wrong with my answer , thanks here is the problem and his correction : here is my answer :

Hello , i am a little confused about this exercise because we talk about gases reaction and we are asked about the concentrations P.S : i have other questions that depends on your answer . Thanks .

If you had this chemical compound, for example, how could you test if its pure? $$C_{15}H_{11}I_4NO_4$$

I am actually studying engineering but we are making a project about chemistry, and i don`t know much about it. I need chemical compounds that i can visualise. For example water. need help [Thread moved from the technical forums to the schoolwork forums by the Mentors] [...and thread contents...

Got some good resources on Chemical plant design and construction. A Chemical plant design and construction. B Chemical plant design and construction.

Freezable. Maintains flexibility when frozen. Re-usable. Non toxic. Need to know the chemical name to enable sourcing for a manufacturer.

I am working with matrices to balance chem equations. I have googled hard equations to balance and find that most, at least what I have found, have the number of elements to be less than the terms in the equation. for example ... FeCr2O4 + ... Na2CO3 + ... O2 -->... Na2CrO4 + ...Fe2O3 + 1CO...

Below are some examples of Chemical Reactions/Equations. 2H2 + O2 = 2H2O CU+ H2SO4=CUSO4 + H2 2MG + O2 =2MGO 2NA + CL2 =2NACL and so on ... I mean is RHS=LHS always true for all Chemical Equations or only for specific chemical equations or not true at all? 2H2O=2H2 + O2 CUSO4+H2=CU+H2SO4...

I was just wondering if a mini fridge could ever work on electricity alone with no toxic chemicals inside?

In alkaline water electrolysis you add Potassium hydroxide, or Sodium hydroxide to the water you want to turn into hydrogen and oksygen. But is the Potassium hydroxide, or Sodium hydroxide consumed during electrolysis and needs to be replaced? Or do you just have to keep adding water as it is...

Hello! I've recently encountered this problem https://www.physicsforums.com/threads/need-major-help.117630/ and solved it and I'm stuck at choosing between 2 solutions. I don't understand why do we need to plug in 0.39 and 0.65 to (1-2x) and NOT to (1-2x)^2. I mean, we were given 2NO2, not just...

Does fermi level (in metals) depend on the density of states? I am asking this because from fermi-dirac distribution it seems like that fermi level is non-dependent of DOS, but there is chemical potential in fermi-dirac distribution, which is said to be dependent of DOS.

In chemical reactions generally ΔG < 0 , but if we were to consider a reversible path between pure reactants and products at 1 bar pressure , shouldn't the ΔG = 0 for every reaction ? and if it is due to non-pv work , I don't see any non pv work being done in reactions happing in a closed...

Is it possible to chemically inhibit (block/absorb) ionizing radiation from radioactive elements, and is any research being done in this area to use it for long term storage of nuclear waste (in conjunction with other precautions, of course)?

Hi, I'm following an introduction course to chemistry and I am reviewing the chapter on Chemical kinetics. It's shown that the reaction speed for a certain component of a general chemical equation such as aA +bB <-> cC + dD , might be expressed as v = k[A]m[ B]m. I was wondering where it does...

Suppose we add a weak acid HA into pure water, so that upon addition its initial concentration is c. The following equilibria should establish in the system. $$\text{HA}+\text{H}_2\text{O}\rightleftharpoons\text{H}_3\text{O}^++\text{A}^-$$...

I have spent years physically charging high pressure bottles with multi staged bicycle pumps and spent large sums of money on electric high pressure air pumps not unlike a scuba tank air compressor. Pressure’s can be as high as 4500 PSI . The pressurized bottles are usually 300 to 500 cc’s. I...

1. How do you remove ants chemical trails on the wall? Water and rug not enough? 2. What are the exact details of the ants incredible chemical sensors in their antenna? How can they able to tell the difference between a hydrocarbon with 25 carbon atoms versus 24 atoms? 3. Lastly, is there an...

I noted that the number of carbons in the main chain is 7 (5 carcons and the outer two are attached to an outside 'CH3' grouping .. and the bonds are all single so we have a Heptane. We have the main chain diagram structure as follows .. -C-C-C-C-C-C-C- .. If we then number these carbons...

I am trying to learn statistical physics. While learning MB statistics, my textbook defined chemical potential as ##\mu = (\frac{\partial F}{\partial N})_{V,T}##. That's nice. Later when I started on Quantum statistics, my textbook described all three distribution functions via: ##n_i =...

Hi, I am designing a mash tun to produce beer. I have 1300kg of malted barley (at a known density) and 3250kg of water. Please could someone outline a method I could use as I am really struggling. One of the main problems I am having is accounting for the density change of the malt when it...

Does RFID wallet or any other wallet that suggest to be protecting contain any chemical addictive or have a different composition of material so that they can protect against unauthorized card reading?

let's take a chemical equation - CH4+2O2 ------> CO2+2H2O From Reactant side- the coefficient of CH4 is 1 and the coefficient of O2 is 2 From Product side - the coefficient of CO2 is 1 and the coefficient of H2O is 2 we can write this chemical equation in terms of molecules,atoms,moles. Can we...

I would like to write a program to calculate the equilibrium concentrations of 10 or more chemical species at any axial location along a quasi 1D isentropic methane-liquid oxygen rocket nozzle. Is anyone aware of any good textbooks that cover this topic in depth, specifically dealing with large...

For part (a), I used this formula where where the i's represent the substance being used and mu_i^0 represents some reference potential. However, to my knowledge this simply calculates the change in chemical potential from one state to another which is not of much help in finding the relative...

Summary:: I have an assignment on slurry bed adsorption and would like to know how to calculate residence time as it is not specified. I was also wondering if anyone had any suggestions for another isotherm to try and fit the data to (other than freundlich). Thanks ##\frac {dq} {dt} = \frac...

I can't seem to figure out which chemical properties govern the physical property that is young's modulus. For example, any linear (or with a low degree of branching) polyethylene with no crosslinking is still a somewhat rigid and solid substance (higher ym), whereas the most linear possible...

I have need to put some chemicals INSIDE a home electrical appliance which is a closed area. I am thinking and worried that if electrical parts could react with chemical and cause problems? The only possibility I can think of is if the spark from electrical appliances could react with...

J is 7.2 and 7.1 for the triplets (7.2 for the pentet, 7.1 for the sextet), chemical shift 0.93 and 2.62Also is it a AMSX or AMX spinsystem?

It is given that the solution is ideal, i.e. that we can take ##\gamma_A = 1##. I wondered what that small triangle signifies in the second definition? Thanks!

Hi For a personal project, has the energy level diagram of the below reaction been derived? Voltage Applied4B+2LiNO3+C ------------->B4C+2LiNO2+O2 Thanks,

Conversion: 9.65 kg = 9650 g Mass Al = 26.98 g/mol Molar Mass Al2O3 = (2 x 26.98) + ( 3 x 16.00) = 101.96 g/mol Mol Al2O3 = 9650 g / 101.96 g/mol = 94.65 mol Mol Al Required = 94.65 mol x 2 = 189.3 mol Mass 100% Al required = 189.3 mol x 26.98 g/mol = 5.107x103 g Mass 80% Al required =...

Hi, How to draw Lewis diagrams, Lewis symbols , chemical equations in LaTeX?

1a) Step 1: Balance the equation - S8 + O2 -> SO2 = S8 + 8O2 -> 8SO2 Conversion (t to g) 6.00 t = 6x10^6 g Molar mass SO2 = 23 + (2 x 16) = 64 g/mol 6x10^6 g / 64 g/mol = 9.375x10^4 mol SO2 reqired amount Sulphur = 9.375x10^4 mol / 8 mol = 1.172x10^4 mol S8 Molar mass S8 = (8 x 32)...

I see the top version used everywhere. But isn't the bottom version better? Because the top version makes it seem like H2 bonds with the C to its right and the other H2 bonds with the N. Whereas the bottom version shows the bonds correctly. Should I draw it like the top version and stop annoying...

Hello all! I would like to know what chemical/physical properties influencies the specific heat. For example, why are specific heat of metals smaller than the specific heat of water, and why do ice and steam have a smaller specific heat than liquid water do.

If an endothermic reaction has a lower temperature, since the forward reaction rate decreases more, the reaction should produce more energy to compensate for the decreased energy and raise the rate of the forward reaction until it reaches equilibrium with the reverse reaction. Is this saying...