Top new questions this week:
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Davis, R. E., & Nakshbendi, H. F. (1962). Sulfur in Amine Solvents. Journal of the American Chemical Society, 84(11), 2085–2090. doi:10.1021/ja00870a017 I’ve also done this experiment. But what …
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In the school laboratory, a friend tried the famous Cannizzaro reaction for benzaldehyde. Some $\ce{NaOH}$ was added to benzaldehyde, and the solution was stirred for 30 minutes. What came as a …
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Chloropicrin can be produced through the reaction of sodium hypochlorite with nitromethane. On the surface, this seems to me to proceed through a mechanism analogous to the haloform reaction, with one …
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According to this document on lab safety (faculty.washington.edu/korshin/Class-486/AEESP-safety-notes.pdf), it says to not use $\ce{NaHCO3}$ to neutralise specifically base spills, stating &…
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In van der waals dry transfer, we pick up flakes of materials such as graphene using polymer films. The material is exfoliated onto an SiO2 covered wafer and picked off using the polymer film. It’s …
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I was wondering if there was any obvious reason why I wouldn’t be able to conduct a Claisen condensation between phenylacetonitrile and an ester like methyl benzoate under phase transfer conditions (…
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I need to figure out the structure of a $C_{8}H_{14}O_{2}$ molecule with this IR spectrum: and these $^{1}$H NMR spectrum signals: m means 4 or more spikes. I worked out that the degree of …
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Greatest hits from previous weeks:
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I’ve always been puzzled by this because my teachers happen to use only the KLMN method, but what is the difference between the KLMN and SPDF methods of finding electronic configuration?
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Am I correct in assuming that the following is true? $\mathrm pK_\mathrm a < 3$ is for a strong acid $3 < \mathrm pK_\mathrm a < 7$ is for a weak acid $7 < \mathrm pK_\mathrm a < 11$ …
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I know I should divide $\pu{g L-1}$ by the molar mass of the substance, but I don’t seem to find the specific answer on Google. So just to be sure: If I have $10^{-5}~\pu{g L-1}~\ce{Cu^2+}$ solution, …
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What causes the melting and boiling points of noble gases to rise when the atomic number increases? What role do the valence electrons play in this?
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Let’s take the $\ce{KOH}$ molecule into account. I know it is a base from literature, but how would one go about determining if a molecule is acidic or basic simply based on the structure of the …
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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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If one considers boiling points (in °C) of primary alcohols, one finds the following: methanol: 65 ethanol: 79 1-propanol: 97 1-butanol: 117 1-pentanol: 138 This trend is due to Van der Waals forces …
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Can you answer these questions?
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Generally speaking, because of the Pauli exclusion principle, it’s difficult for the electron clouds of two atoms to overlap unless they are covalently bound together. The degree of overlap can be …
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I have a question about diffusion rate of a slow release drug. The drug I’ve been taking has an extended-release formulation and contains beads encapsulated in a capsule. The beads are coated with a …
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We had a meeting today and talked about solving some issues improving the quality of life of our worker. We were talking about hexavalent chromium. We already deal with the welding fumes, but as I …
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