Top new questions this week:
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I learned that, by using NMR, you could tell how many different hydrogen environments an molecule has. For example, benzene has only one. Since acetaminophen has an amide bond, and the bond has …
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There are a lot of questions here looking for simple methods to measure caffeine content (or extract it) including one of mine here and in Coffee SE: Home science optical absorption test for …
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I’m searching a comprehensive explanation for the following issue. Even though I knew before, that a regioselective bromination of compound 1 could be problematic, I wondered that the undesired 6-…
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As a mathematician, I want to simulate phase separations with the Cahn-Hilliard equation $$ \frac{\partial c}{\partial t} = M \Delta \bigg(\frac{\partial \mu}{\partial c} – \kappa \Delta c \bigg), $$ …
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I am reading about the Self Consistent Field Method and Linear Combination of Atomic Orbitals. Suppose we have one electron and one nucleus, then we can solve the Schrodinger equation explicitly. If …
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This former question is about the mobility constant $M>0$ in the Cahn-Hilliard equation. To determine the value of such a mobility for a simulation study, Kim and Sanders (2020) use the formula $$ …
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Mohr’s method of precipitation titration relies on the fact that silver reacts preferentially with chloride ions instead of chromate ions in solution. When I searched up why this is true, the only …
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Greatest hits from previous weeks:
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I’m not quite sure I understand this. My question is: Calcium chloride is a salt used widely to melt ice on sidewalks and roads. Explain why one mole of $\ce{CaCl2}$ would be more effective than …
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As part of a pre-lab exercise in Chemistry, we went through the necessary calculations to identify an unknown metal in a metal carbonate. The method was gas evolution by means of hydrochloric acid (…
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My chemistry book explains that even though electrons in the $\mathrm{2p}$ orbital are closer to the nucleus on average, electrons from the $\mathrm{2s}$ orbital spend a very short time very close to …
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I know that the lower the pH the faster fermentation occurs. Why does this happen?
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In the standard Periodic Table layout , all the elements up to 56 are in order i.e are in the same layout table. However, lanthanides and actinides are always shown separately from the layout like in …
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From school, I remember a very important rule: first you need to pour the water and then the acid (when you need to mix them) not vice-versa. This is because otherwise the aсid becomes very hot and …
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Do we have that $\pu{1 g/mol} = \pu{1 amu}$ ? Because we have, for the mass of an atom of carbon 12, call it $m(\ce{^12C})$, that $$m(\ce{^12C}) = \pu{12 amu}$$ and furthermore $$\pu{1 mol} \cdot …
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Can you answer these questions?
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I understand that charcoal/biochar are mostly “amorphous carbon,” and that the production of graphite via pyrolysis requires using a <60% C feedstock that will exists in liquid phase …
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Suppose you had a bottle made of sugar glass, and filled it with water that was already saturated with sugar. I know that with a fully saturated solution of sugar in water, no additional sugar can …
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What is the relation the symmetry of a reciprocal vector and lattice planes perpendicular to it? Are the two symmetries equivalent? I have this question because I want to “visualize” the …
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