New answers tagged


I refer to a good response on the general question "Discrete variables in regression model? found on a sister site. The quote in part: General confusion appears when you mix in ordinal data, such as those 5-point "how satisfied are you?" questions. They are expressed in whole number, very easily to be confused with discrete data. However, ...


I'm not sure why you think they are enantiomers. They are actuallually diastereomers as stated: As depicted, the compound to the left is $(2R,3S)$- while the compound to the right is $(2R,3R)$-. Thus, they are pair of diastereomers. To be enantiomers, either the compound to the left should be $(2S,3S)$- or the compound to the right should be $(2S,3R)$-.


There's a great open access paper from 2020 on the subject: "Understanding Trends in Molecular Bond Angles" J. Phys. Chem. A 2020, 124, 7, 1306–1311 The authors calculated a wide variety of species using accurate quantum chemical methods (CASSCF/CASPT2 method, ANO-RCC basis set). They rationalize the trends as a function of the polarizability of ...


My error was that I read the $$\vec{e}_{ij}$$ vectors as if they were canonical vectors. Especially I implicitly assumed that $$\vec{e}_{31} \cdot \vec{e}_{32} = 0$$ Which is of course wrong. If one inserts $$\vec{e}_{31} \cdot \vec{e}_{32} = \cos(\phi)$$ the correct expression is obtained.


The "expanded structure" is the expansion of condensed structural formula. For example, the expanded structure of the condensed structure $\ce{CH3CH2CH3}$ is given below along with the lewis structure Basically, the lewis structure has been simplified by representing the two electron covalent by a dash $—$ instead of dots. Lewis structure ...

Top 50 recent answers are included