# All Questions

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### Friedel–Crafts acylation of substituted anisole

I am attempting to form a synthetic route to a tetrasubstituted benzene compound. In the scheme, there is a step that requires the formation of a carbon–carbon bond in the C-6 position of a methoxy ...
24 views

### How do we draw the Lewis structures of complex molecules and ions?

How do we draw the Lewis structures of complex molecules and ions such as ClOF3, OSF4-, F2SeO2, etcetera? I know that for simpler molecules, we can determine the central atom using lowest ...
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### Enthalpy change in an isothermal process at constant pressure [closed]

While studying thermodynamics I encountered a statement stating that " The Enthalpy change in an isothermal process is zero".I started analysing and got stuck when I came to the condition ...
35 views

### How do chiral molecules actually rotate light? [duplicate]

How do molecules actually change the direction of a photon of light? It requires more of a particle physics answer but the question is highly relevant for chemistry.
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### How to extract transition density cube from .fch file in Gaussian? [migrated]

I have been trying to extract the transition density cube of a simple molecule, $H_2O$. I did a regular geometry optimization and then TD-DFT calculation with a keyword Density=Transition=1, which is ...
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### Why do we use external pressure to calculate work done by a gas in case of compression instead of using internal pressure?

According to formula work done is (Resisting pressure X dV)? Then in case of compression, isn't the resisting force is internal Pressure? Then why we the formula for compression is same as expansion ...
43 views

### How to produce light of wavelength range 95nm to 100nm on large scale and if there is one in market then please send the link [closed]

i need light of wavelength ranging between 95nm to 100nm to perform an experiment on selective ionization of gas mixture and for this technique to be used at large scale i want to know about how to ...
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### How can I store reagent under inert gas?

I need to store some aliquots of 2,3,5-tribromothiophene. I searched for how to store reagent under inert gas, And I found this : https://avantilipids.com/tech-support/faqs/protect-from-oxidation In ...
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### Failure Cases of Adiabatic Approximation

We may exactly write the wavefunction of a molecular system as $$\phi(r, R, t) = \sum_{k = 0}^{\infty} \chi_k(R, t) \psi_k(r, R)$$ where $r$ is the coordinates of electrons, $R$ is the coordinates ...
28 views

### Nucleophilicity [closed]

When considering the strength of a nucleophile, electeonegativity is a factor to consider. A more electronegative atom will hold electrons more strongly and be less willing to donate their electrons. ...
121 views

### Relative abundance of mixture in mass spectra

In MS, as far as I know, the $y$-axis, relative abundance means the number of ions detected. Then does ratio of heights of two peaks stand for molar ratio, not mass ratio For example, given that I ...
38 views

### How to electroplate iridium? [closed]

How to prepare the electrolyte from solid iridium? And what voltage/current is suitable to electroplated? What thickness per hour I can achieve?
35 views