What are the maximum number of electrons in each shell?
Feb 20, 2014 · In the third shell (n=3), we have: The 3s orbital; The 3p orbitals; The 3d orbitals; In the fourth shell (n=4), we have: The 4s orbital; The 4p orbitals; The 4d orbitals; The 4f orbitals; So another kind of orbitals (s, p, d, f) becomes available as we go to a shell with higher n. The number in front of the letter signifies which shell the ...
Reflux under inert conditions - Chemistry Stack Exchange
Oct 8, 2024 · If a procedure calls for reflux under inert conditions, is it alright if I let nitrogen as protective gas run through the condenser for about 15 minutes, and then attach it to the flask with pre-stirred reactants under nitrogen counterflow?
NH protons not appearing in H NMR spectrum of 3,4 …
Jan 31, 2023 · If you have integrated that peak, you'd see the integration value is more than 3-protons of the real compound. That means your compound is really wet when you take the NMR. The following diagram shows ratios of water peak to TMS and residual $\ce{CHCl3}$ peaks in a typical $\ce{CDCl3}$ (with 99.8% $\ce{D}$ and 0.05% TMS) solvent bottle (Ref.1):
How to calculate the amount of gas in a compressed cylinder
Apr 15, 2015 · I am trying to calculate a cost per hour use of a gas we buy in a cylinder. The details I have been working with are: Gas used CP-grade N2 material number: 110628-L can Gas: N, density = 1.251 g/...
quantum chemistry - How does one compute the number of …
I have run into trouble with an exercise in Szabo and Ostlund's Modern Quantum Chemistry. Exercise 3.14: Assume the basis functions are real and use the symmetry of the two-electron integrals [...
organic chemistry - Geometrical isomerism in 1 …
Mar 24, 2024 · $\begingroup$ @Thecoder001 1,4-Dichlorocyclohexane uses cis and trans in its IUPAC name, but 1,3-Dichlorocyclohexane uses R,S nomenclature. For the 1,4 substitution, you can't use R,S because of the symmetry of the molecule.
Why is mononitration of phenol carried out at low temperatures?
Nov 11, 2024 · In addition to prevent a thermal run-off, moderation of temperature typically allows to prefer the formation of the thermodynamically more stable product; normally, this were the p-addition, but this countered by the presence of two reaction sites for the o-addition. The author of the video equally shows this within the first minute of the ...
Diffusion/Streaky bands on TLC plate - Chemistry Stack Exchange
Jun 8, 2017 · 3. Solvent system. Although you say that "this solvent system has been used to run similar wax extracts", its always worth trying different eluents with your chromatography, unless your sample is identical to the prep you're following. A different modifier (formic acid or trifluoroacetic acid often work well), or different solvent mixtures ...
How to run a B2PLYP-D3 calculation in Gaussian 09?
Jan 19, 2017 · %nprocshared=4 %mem=4gb %chk=fohsdft3 # opt freq b2plypd3/aug-cc-pvdz scf=tight Input file taken from fohsdft 0 1 O -3.46278 2.54045 0. H -2.50278 2.54045 0. H -3.78324 3.44539 0. Since B2PLYP-D3 is a method, it goes where the density functional is normally specified.
kinetics - Calculation of the specific rate constant (k) - Chemistry ...
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