New answers tagged

4 votes

What "physical method" does Feynman refer to in The Feynman Lectures on Physics (Vol 1)

In the mid-20th century, instrumental methods available to organic chemists were nuclear magnetic resonance (NMR), infrared spectroscopy (IR), mass spectrometry (MS) and X-ray diffraction (...
user avatar
3 votes

Why is scandium not in Group 13 despite being once called "eka-boron"?

Note that the periodic table we are seeing today is not the same during Mendeleev's period. If you look at the old periodic table, you will find scandium below boron. So, Mendeleev predicted correctly....
user avatar
  • 21.8k
3 votes
Accepted

Why is scandium not in Group 13 despite being once called "eka-boron"?

In older forms of the Periodic Table, boron was not necessarily far away from what we now call scandium. Mendeleev himself used a form where what we now call the fourth and later periods were set up ...
user avatar
  • 38.1k
6 votes
Accepted

Why would tellurium + sodium hydroxide have worked as a good anti-knock gasoline additive (if it wasn't so smelly)?

Midgley tried various compounds, especially $\ce{(C2H5)2Se}$, $\ce{(C2H5)2Te}$, $\ce{(C2H5)4Sn}$, and $\ce{(C2H5)4Pb}$, which all work as anti-knock agents with similar mechanisms. The oldest method ...
user avatar
  • 2,228

Top 50 recent answers are included