Top new questions this week:
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When zinc is added to sulfuric acid, it undergoes a chemical reaction that generates hydrogen gas and zinc sulfate. Can this reaction be reversed by applying pressure to the products converting them …
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I know that 19F NMR spectra are less sensitive to paramagnetic centers as an empirical fact: it’s my experience and that’s what people in my lab have always been saying. For instance, some of my …
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Wikipedia — Carbon sequestration claims that burying charcoal into the soil offsets $\ce{CO2}$ and thus reduces the greenhouse effect: In the soil, the biochar carbon is unavailable for oxidation to $…
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I have seen in organic chemistry books that the solvents they used in reactions are either protic or aprotic, both polar, but can carbocation exist in a non polar solvent? I believe it cannot exist.
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Basically, I want to know if molecular hydrogen (H$_2$) can form hydrogen bonds with other molecules (CH$_4$, CO$_2$, N$_2$). I’m trying to model the mixture of these molecules with SAFT equations of …
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I want to do some RAFT polymerizations but dont have a nitrogen line at the moment. It seems that people have recently implemented oxygen scavenging strategies to enable open-air RAFT polymerization. …
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The following gas chromatograph, taken from “Review of the different techniques to analyse tritium”, labels all but the largest peak. Given that the analyte is likely to be from some source …
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Greatest hits from previous weeks:
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In High School I learned that an exothermic reactions releases energy, while an endothermic reaction needs energy to occur. Now I learned that there is a separate, somewhat similar classification …
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Halogens bonded to benzene ring has three lone pairs. These three electron pairs can cause resonance in benzene ring. But, halogens are also highly electronegative and thus they have strong -I effect. …
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I read my book and learned everything about enantiomers, racemization, $\mathrm{S_N1}$ and $\mathrm{S_N2}$ reactions, but when I’m trying to identify molecules as chiral or achiral, I get confused. …
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Question: The dipole moment of $\ce{HBr}$ is $2.60 \times 10^{-30}$ and the interatomic spacing is $1.41$. What is the percentage ionic character of $\ce{HBr}$? What I know is that the percentage …
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Is the melting and boiling point of ionic bond usually higher than covalent bond? I know that compounds with ionic bonds are usually solid at room temperature, so I want other answers than this. (…
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In phenol, pulling the $\mathrm{p}_z$ electrons from the oxygen atom into the ring causes the hydrogen atom to be more partially positive than it is in aliphatic alcohols. This means it is much more …
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Hemoglobin is an iron-containing oxygen transport metalloprotein in the red blood cells of most mammals. Simply put, it’s a carrier protein. Interestingly it doesn’t carry carbon dioxide in the same …
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Can you answer these questions?
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The below longish quote is from Rosenberg’s Some Aspects on Brønsted’s Energetic Theory. It concerns two chemical species, $A$ and $B$, in a stationary flow enclosed by a pair of semi-permeable …
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I have a question about the following formula: $$Mu/Pu = \frac{1+10^{pHm – pKa}}{1+10^{pHp- pKa}}$$ This formula can be found in the following paper: Begg, E. J., & Atkinson, H. C. (1993). …
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Why is the change in total spin ∆S = 0 during an absorption of a photon, in contrast to the ∆L = ±1, where the photon transfers its angular momentum? I am aware that spin-orbit coupling breaks this, I …
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