All Questions
45,379
questions
9
votes
1
answer
124
views
Where do I find datasheets of zeolites?
I'm looking into uses of zeolites as water absorbers for heat storage and absorbtion cooling. However, I don't find hard numbers on the likes of absorption enthalpies at different temperatures, ...
- 23.8k
8
votes
1
answer
284
views
Why is it so difficult to create mock NMR spectra of macromolecules?
From what I understand, if you have a NMR spectra, you can determine the structure of a macromolecule but it is very difficult to determine what the NMR spectra of an expected structure would look ...
CommunityBot
- 1
8
votes
4
answers
4k
views
Is the order of orientation of electron box diagrams meaningful or arbitrary?
Here is my interpretation when asked to:
By drawing arrows in the appropriate boxes, complete the outer electron structures for Cu and Cu2+
I had no problem in drawing out the electron structure, ...
- 846
9
votes
1
answer
599
views
What is the timescale of disulfide bond formation?
What is the timescale of disulfide bond formation in a given protein? What influences it? Finally, how does one actually measure it?
From what I understand, the reduction and oxidation of bonds ...
- 43k
10
votes
2
answers
3k
views
Explain the nomenclature of 7-amino-4-methylcoumarin
Can someone explain the nomenclature of 7-amino-4-methylcoumarin, pictured below (from the Sigma-Aldrich website)?
The alpha-carbons of the methyl- and amino-groups here are separated by a minimum of ...
- 10.8k
13
votes
1
answer
906
views
Why do biphasic systems of fluorous and organic solvents form?
It's possible to select a perfluorinated hydrocarbon that is immiscible in another organic solvent, forming a distinct phase boundary. Such systems may become miscible at elevated temperature which is ...
- 6,136
16
votes
1
answer
2k
views
What do typical results from inductively coupled plasma mass spectrometry (ICP-MS) look like, and how do I interpret them?
I have a degree in chemical engineering and remember having seen a inductively coupled plasma mass spectrometer (ICP-MS) during the laboratory part of a chemistry course I took while at university, ...
- 1,901
-1
votes
1
answer
5k
views
Is the smell coming out from a portable dehumidifier safe? [closed]
A portable dehumidifier requires the consumer to plug it into an outlet to regenerate its crystal. When the crystal is thus "regenerated", the indicator will change from pink color to its original ...
- 23.8k
8
votes
1
answer
103
views
Retention of surface texture after combustion
Just some while ago I was burning a box of cardboard in my backyard and I saw a very curious phenomenon.
I saw that as the cardboard box started burning it started to curl. Up after a while as I ...
- 23.8k
16
votes
1
answer
5k
views
How are non-carbon stereogenic centers named (S/R)?
The R/S naming system for stereocenters relies on the Cahn–Ingold–Prelog priority rules to rank the four substituents of a stereocenter; the R or S name is then attributed depending on the spatial ...
CommunityBot
- 1
15
votes
1
answer
788
views
Are there any examples of nuclear spin isomers having consequences for chemical reactivity?
Ortho- and parahydrogen are two forms of the $\ce{H2}$ molecule that are distinguished by their pairing or antipairing of nuclear spins, giving rise to metastable singlet (ortho-) and triplet (para-) ...
CommunityBot
- 1
4
votes
1
answer
159
views
Solution based measurement of Solvent-Accessible Surface Area of macromolecules
The Solvent-Accessible Surface Area (SASA) is a valuable metric for looking at protein folding and protein-protein interactions. However, this measurement is typically done by calculating the SASA ...
- 23.8k
11
votes
1
answer
4k
views
What's the difference between precipitate and turbidity?
In many tests for various radicals, a "<color> precipitate" or "<color> turbidity" is mentioned. For example, lead ...
- 10.8k
8
votes
1
answer
253
views
What does the charge distribution around a Stone-Wales defect look like?
I'm reading a book on carbon nanotubes (P.J.F. Harris, Carbon Nanotube Science, to be specific) at the moment and puzzling about Stone-Wales or 5775 defects. This is where two adjacent carbons undergo ...
- 2,638
5
votes
1
answer
524
views
Mercury, amalgams and mercury compounds [closed]
Mercury is toxic. It forms amalgams and inorganic mercury compounds/salts are available.
My question is on toxicity. I am interested in its toxicity, not the mode of action (as it will be part of ...
CommunityBot
- 1