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On the DF-B97D3/def2-TZVPP level of theory the bond angle of water is $104.2^\circ$. Which matches up quite well, see what is the bond angle of water? The bond angle of oxygen difluoride is $104.9^\ci …

The trigonal bipyramidal shape of $\ce{PCl5}$ is indeed the lowest energy conformation. I have had a very hard time figuring out what your description of the structure meant and I am still not convi …

Have a look at Molcalc. It's fully online and uses JSmol as a visualiser. Alternatively you can browse the Pitt Quantum Repository for structures that have already been calculated.

One reasoning would be applying Bent's rule: In ethane the $\ce{C-H}$ bonds are approximately composed from $\ce{61\% sp^{3.3} C}$ and $\ce{39\% s H}$ orbitals. That results that the $\ce{C-C}$ bon …

The crystal structure shows a strangely distorted molecule with only $C_\mathrm{i}$ symmetry. Values have quite a wide range, $\angle(\ce{CCH})\approx 100-120^\circ$. See below for all values and xyz …

I highly doubt that it could exist. The co-linear arrangement, $C_{\infty\mathrm{v}}$, of $\ce{Cl-O-S-Cl}$ is a second order saddle point on the DF-BP86+D3(BJ)/def2-SVP level of theory on the $S=0$ po …

I completely agree with Gonçalo Justino's answer, but would like to add another shade to it. In principle there are quite a few possible arrangements thinkable for this molecule - at least in the gas …

Ivan already stated quite briefly in the comments, that the planes you drew would transform an upward facing chlorine to a downward facing chlorine and vice versa, and that the same holds for the meth …

Propadiene is an allene which has $D_\mathrm{2d}$ symmetry. This dictates that the distances between the hydrogen atoms at the opposite terminal carbons are the same. In mathematical terms: $$d(\ce{H …

This is not a good exercise question, because none of the options is actually correct. It basically asks you to blindly apply a model which cannot yield the correct result. Before continuing any deepe …

Fixing the bond angle to a set value seems like an extreme solution to this problem. It is. To be honest, fixing parameters in a calculation is almost always no solution at all. The resulting geo …

With VSEPR theory you can predict the structures of $\ce{BX3}$. Since boron only has three valence electrons, all of which are used for σ-bonding to the halogen atoms, they arrange in a trigonal plana …

Bent's rule is not as much a rule as it is an observation. It was first applied in the context of valence bond theory and therefore used for hybrid orbitals only. At the initial stages, VBT only used …

Yes, you are correct. The IUPAC defines alkyl groups in the following manner: Univalent groups derived from alkanes by removal of a hydrogen atom from any carbon atom $\ce{–C_{$n$}H_{$2n+1$}}$. …

According to my German version of Holleman-Wiberg: Inorganic Chemistry there is one additional, very short lived species, the so called tetraoxygen. A short article is also available on Wikipedia. Wi …