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  • The main chemistry prep room at my institution (and also at the ambulance station) is labelled with the standard green compressed gas sign. However, there is a small '2' included within the diamond. ...

  • Slush hydrogen is a mixture of liquid and solid hydrogen at the triple point considered as a possible vehicle fuel. What is the need of having it at the triple point? Couldn't any other set of thermod...

  • I have processed a si/polymer hybrid using a silane coupling agent which I need to determine the energy gap / band gap. Would you please let me know the procedure to go about determining the band gap...

  • The case of polar solvents is clear to me - we get an attraction between opposite charges. However, how do non-polar substances dissolve in non-polar solvents? How could it be explained on a molecular...

  • While drinking milk (or better 'while seeing the milk I'm gonna drink') a question came up to my mind: Why does the milk sometimes flake, even if not in contact with some other substances? I guess t...

  • For some DFT calculations I performed with localized (Gaussian) basis sets, I wonder how the basis sets I used are properly named. The names I could gather are: H, C and O: 6-311G(d,p) Al: 8-511G* ...

  • I'm looking into building an absorption chiller as a decidedly non-professional DIY project. For safety reasons and because temps. > 0°C are sufficient, I won't be using ammonia but some saline soluti...

  • Where did the INN name of Fentanyl come from? Fentanyl is a potent anilidopiperidine opioid. I know that the INN name of paracetamol came from its chemical name para-acetylaminophenol (par-acet-am-ol)...

  • Question: Suggest an explanation for the coordination number in the $\ce{CsCl}$ lattice being different from those in $\ce{NaCl}$. Standard answer: Caesium ion is larger than sodium ion, he...

  • Why does Butane burn blue? From my (very) basic understanding of chemistry, carbon and hydrogen do not burn blue, their radiation spectra are different-so why should the combination burn blue? Please ...

  • I've learnt in Chemistry that for example in Chromium, the 4s subshell only has one electron in favor of making the 3d subshell half-full. Also, for Copper the same happens. What other circumstances ...

  • So I was thinking about something to do for a science fair and photosynthesis sounded like a good idea. I was wondering what the exact process of photosynthesis was on a chemical level. I know the f...

  • $\ce{NH4-}$ is conjugate acid and $\ce{NH4}$ is conjugate base. $\ce{NH4-}$ is conjugate acid because it has one more Hydrogen. The thing that is difficult for me to understand is why $\ce{NH4-}$ is...

  • I know the Cannizzaro reaction takes place in carboxyl compounds without $\alpha$-H with the regular examples being formaldehyde and benzaldehyde. But can this reaction take place with say diphenylme...

  • I recently freezed a huge bunch of apple slices, and thawed them again a few days later. After thawing, I noticed a few things compared to a batch that I had put in the fridge (no freezing) The appl...

  • Besides Alpha, Beta, and Gamma, are there any other types of radioactive decay? If so, what are they? Is there any type of radioactive decay more powerful than Gamma?

  • Apologies for the extremely basic question, but I would like to look up the amount by which the volume (or equivalently, density) of various substances changes when they freeze. However, I don't know ...

  • I am very confused, I think using reduction would be a good start, but LiAl would go straight to an OH.

  • How do I solve problems where I'm asked for $\Delta H^\circ_f$ and given $\Delta H^\circ_f$ values for equations with the involved elements? For example: Find the $\Delta H^\circ_f$ of the following...

  • It has 5 valence electrons, but only loses 3 of them to make a +3 ion. Why does this occur? I believe it may have something to do with how losing 3 electrons leaves you with the p sublevel full, but ...