Top new questions this week:
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This is pyracyclene: If I’m correct, pyracyclene has four resonance forms (double carbon bonds shown in red): Now my problem is estimating the dominance of each form. Are they equal or is there one …
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In an open quantum system setup where the system is coupled to infinite harmonic oscillators as bath (as in the Caldeira leggett model, for example), through the Hamiltonian, $$H = \frac{\hat{p}^2}{2m}…
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I am aware of the fact that d-block elements like zinc, cadmium and mercury have lower melting points than other d-block elements. Also I am aware that these three metals have a fully filled d shell. …
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I plotted the boiling point of alkanes against their molar mass and found the following trend: I expected the trend would be linear, since (based on my understanding of what I’ve learned in class so …
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I am trying to purify ferrous sulfate (for some electroplating experiments) and I came up with the following process: Dissolve 200g of iron fertilizer in 300ml of distilled water heated to 54 °C (…
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In the picture above you can see how some logos have permanently burnt-in. I wonder if it has to do with the fact that the materials are “organic” as the name suggest, or because current …
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If we compare the boiling point of hydrogen and helium using molecular weight criteria (both have London dispersion forces as intermolecular forces of attraction because both are non polar then the …
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Greatest hits from previous weeks:
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The boiling point of water is $\pu{100^\circ C}$. However, we find that even at room temperature, water can evaporate into gas. Therefore, water vapor can exist at temperatures of, say, $\pu{50^\circ …
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What are the definitions of these three things and how are they related? I’ve tried looking online but there is no concrete answer online for this question.
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I have read conflicting advice on various sites about the appropriate methods for cleaning plastic and rubber items and would like to ask people who actually know what’s going on what they would …
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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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A mixture is made by combining 110 mL of 0.15 M $\ce{HCl}$ and 215 mL of 0.055 M $\ce{HI}$. What is the pH of the solution? $$\ce{HCl -> H+ + Cl-}$$ $$\ce{HI -> H+ + I-}$$ According to what I …
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This is a 10th-grade question. The melting point of a substance decreases with increase in presence of impurities in it. The melting point of ice decreases from 0 °C to -22 °C on mixing salt in it …
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I am looking for the precise definitions, as I am very confused as to what they are exactly because although I mostly understand what they mean, I have encountered some conflicting definitions that …
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Can you answer these questions?
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I dissolved $\pu{25 mmol}$ $\ce{FeCl3*6H2O}$ in $\pu{25 ml}$ ethanol and got a clear ethanol solution of $\ce{FeCl3}$ 4 days ago. And I keep it in a drawer from light these four days. However, when I …
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I have 2 steel parts which were both powder coated in a polyester powder coat, however one of them does not perform exactly as I would expect it in my unusual use case which depends on temperature. I …
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I was reading about atropisomers and their impacts on drug design, and I started wondering whether we have a formal definition for identical molecules. Atropisomers are not the same molecules because …
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