Unanswered Questions
8,738 questions with no upvoted or accepted answers
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Bromination with NBS and AIBN
I reacted 3-pyridylacetic acid (6 fluoro) with NBS and AIBN in CCl4. I refluxed the reaction mixture for 4 hours at 80 degrees. No reaction occurred, and the starting material remained (based on TLC ...
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Finding porosity using Ideal gas law
A 1 $cm^3$ sample or reservoir rock is put in a chamber of 10 $cm^3$, where the total pressure is 750 $mmHg$. This chamber is closed, and a valve is opened such that the air can expand to another ...
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Will CO2 dissolved in water change the tds reading of the water?
I have filtered water reading between 0 and 4 ppm on a tds meter. I add CO2 using a soda stream. The water reads 27-34 ppm after adding CO2.
Is the change in tds readings due to the CO2 or due to ...
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Why Car Parrinello Molecular Dynamics doesn't need an SCF calculation at every time-step?
Reading the various terms of the Lagrangian in CP-MD I'm trying to understand why there is not an SCF procedure hidden there.
In fact, it seems to me like the second term of the Eulero-Lagrange ...
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why does sp mixing occur in smaller elements?
So I just started learning MO theory. I'm aware of a difference in the MO energy diagrams for elements smaller than n=14.
The sources I refer all point to s-p mixing in the smaller elements which ...
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How can oxygen make a coordinate bond in O3 without vacant orbital
I was taught that for the formation of a coordinate bond the first condition is that the donor atom must have a lone pair of electron and second condition is that the acceptor must have a vacant ...
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2
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How does ML / AI models can help us in high throughput screening studies?
I am a chemist interested in applying fast methods to search for suitable molecular candidates for several applications (let's say HOMO LUMO gaps, excitation energies, etc.) As a consequence, I ...
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Why would large activation energies give a large gradient of the rate constant?
I have read carefully this answer on SE, and there is a part I don't understand. SE exchange user said:
If you plot the Arrhenius equation (given in your text) vs temperature the slope of this gives ...
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Trend of effective nuclear charge down a group
Does the effective nuclear charge decrease down a group? Many online sources,including Wikipedia show this conclusion with the calculated data. But our teacher told us and again some online sources ...
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What is the density of solid methane at atmospheric pressure?
I'm curious about the density of solid methane since it might be slightly more energy dense than liquid natural gas. The materials project computes the density to be 0.433 g/cm3 which is higher than ...
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pH probe equation derivation
This is a bit of a niche question, but I am struggling to find a good answer just by Googling around. I've been reading recently into the function of pH probes and ion-selective electrodes in general.
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Is stainless steel current collector is corroded by sodium perchlorate electrolyte solution? If yes then can you please explain
I used sodium perchlorate electrolyte solution for making cell and in my electrode I used stainless steel as a current collector and cellulose as a separator.when I m doing cyclic stability then the ...
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Reason of screening effect
I am totally confused about the screening effect. Is it because of the repulsion of inner electrons which ultimately reduces the net force of attraction for the outer electron , I'm pretty sure that ...
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What are the EN values for sp and sp2-hybridized carbon atoms?
I've asked ChatGPT and found on Quora separate answers:
Quora states the EN values of sp and sp2-hybridized carbons are 3.2 and 2.7, respectively while ChatGPT claims 3.3 and 3.0.
Any additional ...
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Mass of boron in boric acid
I have recently submitted a slime activator product for EN71-3 UK toy safety testing. The test aims to measure the amount of boron that is able to migrate from the toy if it is consumed by a child in ...
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