All Questions

I am new into LC-MS/MS stable isotope targeted downstream analysis. I've found numerous papers talking about MID (Mass isotopomer distribution) but in some european publications I found CID (carbon ...

$G = H - TS$ $=> dG = dU + pdV + Vdp - TdS - SdT$ At constant pressure and temperature (which is the condition for most chemical reactions) we have $dG = pdV - Tds$ Now, $dq = dU + dW$ ( first law ...

I am aware that combustion reactions are exothermic. The energy stored in the chemical bonds of the products is less than the energy stored in the chemical bonds of the reactants. The difference in ...

What is the total entropy change of an ideal gas undergoing an adiabatic expansion in a vacuum? It is my understanding that since the expansion is adiabatic, there is no change in entropy change ...

I'm self-educating myself in the periodic table and came across some number notations I am not familiar with. Also to clarify, I have no school background and English is not my native language. That ...

The simple mechanical application of the electron hole operator to sulfate radical anion suggests but two possible reactions (if energetically possible), of which one is: $\ce { •SO4– + h+ = SO3 + O ...

I've heard that elemental lead and lead oxide are inert. I know that lead compounds and salts are poisonous. If lead is boiled, are the vapors toxic or small particles toxic when condensed?

I am simulating the combustion temperature for various compositions of syngas and finding the product temperature. Part one is varying the ratio of CO and H2 from 3:1 to 1:3 in the syngas, burning it ...

I came across this question: 1 g of H2 gas expands at STP to occupy double of its original volume. The work done during the process is? So can a gas expand and change its volume at STP by doing work ...

I'd like to use 5% sulfuric acid and 3% hydrogen peroxide as an etching solution for copper. (In the past I've used dilute hydrochloric acid and hydrogen peroxide but the generation of chlorine gas ...

Why do some heavy molecules exist as gases at a certain temperature, when lighter molecules are solids or liquids at that temperature? I am asking because radon is normally a gas, but that it has a ...

When we add heat to CuCO3, we have a decomposition reaction of CuCO3 ---> CuO + CO2. Why is this so? Why does it decompose into CuO and CO2? I read that this has to do with polarization. Please ...

I am separating a larger container of sodium polyacrylate crystals into smaller containers for student experiments. Commonly known as "Deco Cubes" and used by florists in decorations and ...

When I was eating papads (well-toasted crispy doughs/chips served in various regions of India and Nepal) I found that touching them with my wet hand made them make quiet yet audible crackling sound. ...

This article from 2009: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2776169/ mentions the potential impact of tautomerism on QSAR modelling, and concludes that more work is needed to address it. 12 ...

I have a ween problem with amino acids (AA). Everywhere I look are AA written with NH2 and COOH group, but why? pK of these groups are (at neutral pH = 7) for NH2 group lower and for COOH group higher ...

Options A) 6&6 B) 6&5 C) 5&6 D) 5&4 According to me exclusive of central atom there are 6 atoms in a plane

All my knowledge To solve this answer you have to do electronic configuration of an atom whose atomic number is 16 , so the electronic configuration will be = 1s^2, 2s^2 ,2p^6 ,3s^2 ,3p^4 , what I ...

Understandably, the relative atomic masses of isotopes are often not close to whole numbers as they're adjusted for isotope abudandancy eg. $A_r(Cl)\approx35.45$. However, wouldn't one expect the ...

I need a code/app/website that can receive a DNA sequence, for instance AATCT, and output a file with the atomic coordinates. I used to do this on this website http://www.scfbio-iitd.res.in/software/...

I was recently watching a video on electro plating I understand that it only works with metals so I wondered if there's a method to do the same thing but with non-metals.

Why doesn't the bromine react with the methyl red at the start of the bromine clock reaction? I assume the rate of reaction (and rapid removal) of bromine with phenol is much, much, much faster than ...

The following carbanion has 20 pi electrons . Shouldn't it be anti aromatic ?

Made homemade shampoo using: Sodium lauryl sulfate (SLS) Glycerin 95% ethanol Sodium stearate Made homemade soap using: 20% sodium hydroxide Vegetable oil 95% ethanol 20% sodium chloride ...

Thermo Fisher website explains that "WDXRF uses crystals to disperse the fluorescence spectrum into individual wavelengths of each element, providing high resolution and low background spectra ...

I'm a newbie student in theoretical chemistry, and i just start to learn to basics in this field, and I always encounter a bunch of concepts like Hartree-Fock (HF), Electron Density, DFT. I managed to ...

Let’s say we have a simple exothermic reaction $\ce{A_{(g)} + B_{(g)} -> C_{(g)}}$ Since it’s exothermic, that means that kinetic energy of C is greater than the kinetic energy of the reagents. ...

In an ideal world, is moving a piston quickly, a reversible process as there is no heat loss due to friction? (as opposed to a quasi static process)

Consider an energy profile diagram. My doubt is that why does change in potential energy (PE) equal change in enthalpy here? At constant pressure change in enthalpy equals the net heat exchanged ...

I'm confused about the definition of "charge separation" in the context of resonance structures. One of the rules of stability of resonance structure is "the structure with least ...

I need to mix TEA and H2SO4 in equimmolar ratio. Acid is 72% pure and TEA is 99% pure.Both in liquid form. What should be the mass of each liquids? Further can I increase the purity of both liquids ...

I am trying to re-attach an automotive clip (painted plastic with a yellow (epoxy?) hard adhesive backing) which secures a trim piece back onto the vehicle's roof sheet metal (unpainted (primed?) area)...

I was thinking about the 2nd law of thermodynamics, and how ΔStotal=ΔSsystem+ΔSsurrounding. You could potentially have a reaction with negative ΔStotal occurring- a non-spontaneous reaction. But by ...

My chemistry teacher told me that the Gibbs Free Energy (G) function was created because determination of ΔSsurroundings, and thus ΔStotal was difficult, and we needed something better to explain ...

I have both Malonyl - CoA and Hexanoic Acid at my disposal. There is very little information on the SYNTHETIC process of olivetol acid. From my understanding, you must first convert the two CoA's into ...

Let's suppose in this question hydrogen bonding would be considered in structure 3 ... if yes, then it would be a weak acid because it will not donate H+, but according to the answer given in the book ...

Can someone please tell me how do model chemical reactions, by this I mean prepare input of chemicals on LHS and RHS of the equation. I can see how input CO2 can be prepared and for H+, I think for ...

I have {6-[2-(benzylamino)ethyl]-1,4-dihydropyrimidin-4-yl}methanol (at the top) and have to make the retrosynthesis steps for my class. I tried different things but I'm not sure about it. In 1 you ...

Suppose, I have two ions with the same number of electrons, but their electronic configuration differs slightly from eachother. Then, will they be called isoelectronic?

If an object is chiral, itself and its mirror image are non-superimposable and represent two distinct version of the same object. A hand, for instance, can be either the right hand or the left hand. ...

As the electrically-charged ionic tails of surfactants used to attach to the magnetic nanoparticles require the particle to be magnetized to stick to them; if a ferrofluid is passed has a solenoid DC ...

LiNiCoMnO2 This video shows the opening of Lithium Ion battery at https://www.youtube.com/watch?v=-KAHiCb_8-s Question 1: Can LiNiCoMnO2 powder be made from melting Li,Ni,Co,Mn together at high ...

Bonding molecular orbitals are distorted towards the more electronegative atom and so the atomic orbitals from this atom contribute more to those bonding orbitals. This implies that anti bonding ...

Usually in preparative chromatography one needs to know when the desired substance to be separated is coming down the pike. Often this required some sophisticated instrumentation. But, it occurred to ...

This is not a homework question, but for research. I am performing mass spec on serum metabolites using Thermo Q Exactive PLUS with a HESI source which was set to a spray voltage of -2.7kV under ...

I just used Bounce fabric softener moistened with water to remove stuck tar and dried bugs from my car. It worked like a charm, wiping it clean in seconds. Why did this work? The web says it ...

I am new in the Organic Chemistry (World of Reactions). I had got one question in my test. But, when I had seen it, I got no proper logic to tick the correct answer, and then when I saw solution, then ...

As in a recent question, I mentioned I collect elements. My collection already has quite a few elements and a rare alloy (I have silicon, molybdenum, tungsten, gold, platinum, silver, copper, ...

I am currently doing a research project, and for it, I would like to use a photospectrometer to find the concentration of Calcium Perchlorate in my sample solutions. My current method of data ...

I would like to know the explicit steps to compute the bond correlation function $$g_6(r) = \langle\Psi_6^*(0) \cdot \Psi_6(r)\rangle$$ for colloids in my experiment (2D). I have the position of all ...