Thoughts on how to structure HW policy discussion Now, it's 2 am and none of this is set in stone, this is open to discussion. I'd like to mention that I actually came up with this independently and upon reading Martin's answer here we seem to agree on quite a few things. We can categorise que...

As established in a previous question, coordination compounds typically have a field split between the $\mathrm{t_{2g}}$ and the $\mathrm{e_g}$ d-orbitals.[1] This energy difference can be explained by the crystal field theory which assumes negative point-charges approaching a complex and destabi...

I was wondering if it is possiple to make formaldehyde from urea. I noticed they have a similar structure, but where the hydrogens in formaldehyde is replaced with two amide groups. Would it be possiple to remove those groups and replace them with hydrogen?

Instead of doing the whole derivation, I will provide the following two hints usefull in the derivation: Use the quotient rule (as is was already done by OP). $$ \left({\frac {f}{g}}\right)'={\frac {f'g-fg'}{g^{2}}} \, , $$ where in this particular case $f = \sum_{i,j} c_i c_j H_{ij}$ and $g ...

I remember having read in a book, Ask Me Anything (Dorling Kindersley), that a combination of copious amounts of table salt and vinegar is explosive. Now this was a really long while back, and I can't even find my copy of the book anymore. But I'm quite sure there was a mention of salt+vinegar b...

My 4 year old granddaughter, playing with molecular models, began making a cyclopentane ring, each of whose carbons bore a spiro-connected cyclopentane ring of its own , in the manner of spiro [4.4] nonane. If she hadn't run out of carbon atoms first, the result would have been a pentagonal crow...

Due to symmetry constraints ($D_\mathrm{3h}$) in $\ce{SO3}$ there 6 electrons in $\pi$ type orbitals. In a wider sense of the term this molecule is Y-aromatic, but the HOMO actually represents two electrons in in-plane lone pair orbitals of oxygen. The LUMO is an antibonding $\pi$ orbital with re...