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Chemistry
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Nicolau Saker Neto

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physical-chemistry

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22 posts edited
175 helpful flags
5,367 votes cast
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332 Bookmarks

Votes Activity Newest Views Added
22
votes
4
answers
1k
views

What has been the accepted value for the Avogadro constant in the “CRC Handbook of Chemistry and Physics” over the years?

physical-chemistry
12h ago MaxW 20.7k
23
votes
3
answers
2k
views

Why is 1-ethylidene-4-methylcyclohexane chiral?

organic-chemistry stereochemistry chirality
16h ago orthocresol♦ 56.2k
27
votes
2
answers
22k
views

What is the pKa of the hydronium, or oxonium, ion (H3O+)?

physical-chemistry acid-base ph theoretical-chemistry
Jan 20 at 8:38 Niemand 19
12
votes
1
answer
693
views

Why doesn't ionization energy decrease from O to F or F to Ne?

periodic-trends ionization-energy
Jan 17 at 20:26 orthocresol♦ 56.2k
12
votes
1
answer
354
views

What are the criteria for a molecule to be chiral?

stereochemistry chirality
Jan 17 at 2:13 orthocresol♦ 56.2k
1
vote
1
answer
165
views

Example of an achiral molecule without a plane of symmetry or inversion center?

chirality symmetry group-theory
Jan 15 at 16:03 orthocresol♦ 56.2k
12
votes
3
answers
24k
views

Why is active mass of a pure solid or liquid always taken as unity?

physical-chemistry concentration phase
Jan 8 at 6:03 Md_Asher 1
4
votes
2
answers
2k
views

Is this a possible explanation as to why sigma bonds are stronger than pi bonds?

physical-chemistry bond molecules theoretical-chemistry
Jan 1 at 15:47 shashank Sharma 1
38
votes
3
answers
18k
views

What is the reason for the exceptional stability of the cyclopropylmethyl carbocation?

organic-chemistry stability carbocation
Dec 31 at 17:18 Buraian 401
37
votes
10
answers
6k
views

Why is chemistry unpredictable?

physical-chemistry experimental-chemistry theoretical-chemistry process-chemistry
Dec 25 at 7:52 Community♦ 1
5
votes
6
answers
9k
views

Resources for learning Chemistry

software reference-request books
Dec 15 at 17:59 Stanislav Bashkyrtsev 1,402
3
votes
2
answers
4k
views

Abbreviations in electronic configurations

electronic-configuration
Dec 7 at 6:39 andselisk♦ 31.8k
6
votes
1
answer
363
views

Infinite Increase in Entropy when Energy added to Absolute Zero

enthalpy temperature entropy
Dec 5 at 9:00 theorist 7,838
11
votes
1
answer
765
views

Why is a third body needed in the recombination of two hydrogen atoms?

physical-chemistry kinetics theoretical-chemistry
Dec 2 at 1:18 Bertram 452
5
votes
1
answer
3k
views

What's the energy density of liquid nitrogen?

energy
Nov 23 at 9:35 Ashish 1
8
votes
3
answers
4k
views

Is the Henderson–Hasselbalch equation volume independent?

acid-base ph titration henderson-hasselbalch-equation
Nov 19 at 8:44 MaxW 20.7k
13
votes
1
answer
5k
views

Diatomic halogens - bond strength

bond molecular-orbital-theory
Nov 18 at 8:02 Santosh 1
40
votes
4
answers
44k
views

The reason behind the steep rise in pH in the acid base titration curve

acid-base ph
Oct 25 at 7:08 G M 8,589
61
votes
1
answer
8k
views

Why does F replace the axial bond in PCl5?

molecular-structure halides hybridization valence-bond-theory
Oct 16 at 5:51 Mathew Mahindaratne 26.2k
15
votes
1
answer
3k
views

Why six C atoms are usually seen in cyclic compounds?

organic-chemistry molecules atoms energy stereochemistry
Oct 15 at 16:16 Community♦ 1
4
votes
2
answers
5k
views

Does fluorine ever form a double or triple bond?

bond halides
Oct 3 at 17:36 Community♦ 1
1
vote
1
answer
84
views

Why do PES graphs list 4s after 3d? [duplicate]

molecular-orbital-theory ionization-energy
Sep 21 at 8:42 Poutnik 17.5k
1
vote
1
answer
3k
views

Are precipitations exothermic and/or endothermic?

enthalpy precipitation
Sep 20 at 10:09 Holderness and Lambert 21
10
votes
2
answers
21k
views

Which is more stable? A phenyl carbanion or a disubstituted vinylic carbanion?

organic-chemistry stability
Sep 19 at 7:31 Community♦ 1
56
votes
3
answers
6k
views

Why is it wrong to use the concept of hybridization for transition metal complexes?

bond coordination-compounds transition-metals hybridization
Sep 8 at 19:47 Mathew Mahindaratne 26.2k
5
votes
1
answer
60
views

Question about null space balancing method

stoichiometry
Sep 8 at 13:54 Nicolau Saker Neto 24.3k
6
votes
2
answers
2k
views

Reactions between enantiomers in a racemic mixture

organic-chemistry stereochemistry isomers mixtures
Sep 7 at 18:57 ron 78.1k
25
votes
3
answers
21k
views

Why is lithium the most reducing alkali metal, and not caesium?

inorganic-chemistry periodic-trends reduction-potential
Aug 31 at 6:33 arni jarintasnim 1
12
votes
2
answers
373
views

Can non-deuterated solvents be used for 13C-NMR (and in fact other nuclei)?

nmr-spectroscopy
Aug 28 at 16:38 Buttonwood 16k
1
vote
1
answer
238
views

Stereo-isomerism in 7-methylbicyclo[2.2.1]hept-2-ene

stereochemistry isomers symmetry
Aug 26 at 18:01 Mathew Mahindaratne 26.2k
1
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