Chemistry Stack Exchange Community Digest

Top new questions this week:

How does Potassium Hexfluoronickelate(IV) exist in a stable state?

Nickel generally does not exist in a $+4$ Oxidation state. Wikipedia has the following to say regarding Nickel(IV): Ni(IV) is present in the mixed oxide $\ce{BaNiO3}$. ....... Ni(IV) remains a ...

inorganic-chemistry coordination-compounds oxidation-state  
asked by Aniruddha Deb 6 votes
answered by Oscar Lanzi 9 votes

Dimethylethylamine or Ethyldimethylamine?

I thought that Organic Naming was based on alphabetical for alkyl branches, so I thought it was ethyldimethylamine, however google results show me Dimethylethylamine. So which one is right? And is ...

organic-chemistry nomenclature  
asked by Luke 4 votes
answered by orthocresol 8 votes

Miller Indices and the case of a cubic crystal

My textbook, Solid-State Physics, Fluidics, and Analytical Techniques in Micro- and Nanotechnology, by Madou, presents the following image and explanation in a section on x-ray diffraction and Laue ...

crystallography miller-indices  
asked by The Pointer 4 votes
answered by Karsten Theis 2 votes

What is the effect of basis set on charge transfer?

I am calculating the energy and charge transfer of a globally neutral system, composed by two opposely charged monomers (EMIM-BF4), coming closer to each other, with DFT (B3LYP) and MP2. As a thumb ...

quantum-chemistry basis-set  
asked by Marco Di Gennaro 4 votes
answered by rlaplaza 1 vote

How do the three Miller indices (hkl) denote planes orthogonal to the reciprocal lattice vector?

The Wikipedia page for Miller indices defines Miller indices as follows: There are two equivalent ways to define the meaning of the Miller indices: via a point in the reciprocal lattice, or as the ...

crystallography lattices miller-indices bravais-lattices  
asked by The Pointer 3 votes

Is there an anisotropy factor (g factor) for TDDFT Abs and CD calculations?

Experimentally, anisotropy factor is calculated by dividing the CD spectra by the absorbance spectra multiplying by a factor of 32980 (in order to get a nondimensional quantity) Theoretical ...

quantum-chemistry spectroscopy chirality uv-vis-spectroscopy td-dft  
asked by C. Alexander 3 votes

Interstitial defects in crystals: "high energy configurations"?

In the Wikipedia article on crystallographic defects, a type of point defect known as an interstitial defect is described as follows: Interstitial defects are atoms that occupy a site in the ...

crystal-structure crystallography  
asked by The Pointer 3 votes
answered by DrMoishe Pippik 3 votes

Greatest hits from previous weeks:

Why lanthanides and actinides are shown separate from standard Periodic Table layout?

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 ...

periodic-table history-of-chemistry  
asked by SRy 13 votes
answered by Uncle Al 12 votes

Is there an easy way to find number of valence electrons"

I want an high-school level answer. What I mean with "valence electrons" is the outermost electrons in that atoms' electronic arrangement? For example, 3 in an atom with an electronic arrangement of ...

atoms electrons orbitals  
asked by user4117 4 votes
answered by Jerry 5 votes

Difference between thermodynamic and kinetic stability

What is the difference between thermodynamic and kinetic stability? I'd like a basic explanation, but not too simple. For example, methane does not burn until lit -- why?

thermodynamics kinetics stability  
asked by Cyrus 37 votes
answered by thomij 43 votes

Why add water first then acid?

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 ...

acid-base experimental-chemistry safety  
asked by pmod 54 votes
answered by permeakra 53 votes

What are t2g and eg in CFT?

In the crystal field theory (CFT), when the splitting of the d-orbital occurs, it gets divided into two parts. The upper part with higher energy is the $\mathrm{t_{2g}}$ and the lower part with lower ...

coordination-compounds molecular-orbital-theory notation symmetry group-theory  
asked by NeilRoy 18 votes
answered by AngusTheMan 25 votes

How to determine number of structural isomers?

I have come across many questions where I'm asked to give the number of possible structural isomers. For example number, structural isomers of hexane is 5, while the number structural isomers of ...

organic-chemistry isomers  
asked by Freddy 22 votes
answered by matt_black 23 votes

What is the condensation point of water?

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 ...

water  
asked by CodyBugstein 9 votes
answered by Richard 11 votes

Can you answer these questions?

Why is Cadmium so carcinogenic compared to other heavy metals?

This free article as well as this article do a good job highlighting the carcinogenic effects of Cadmium and the mechanisms by which they occur. However, my question is why is Cadmium so carcinogenic ...

biochemistry transition-metals  
asked by Aniruddha Deb 1 vote

Does Glycerol give silver mirror test with Tollen's Reagent?

I did an experiment in my school lab in which we had to identify the given organic compound. In my Lab Manual, it's written: Take 2 ml of Tollen's Reagent and add a few drops of organic sample. ...

organic-chemistry experimental-chemistry organic-oxidation  
asked by Vedansh Agrawal 1 vote
answered by Aniruddha Deb 0 votes

How are the pKa's of very strong acids derived mathematically?

It is often said that "for very strong acids (HCl, H2SO4, etc.), the pKa value cannot be experimentally derived from standard titration and instead needs to be theoretically computed". However, I ...

acid-base  
asked by Just A Young Artist 1 vote
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