User Nicolau Saker Neto

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?

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

Stack Exchange Network

current community

your communities

more stack exchange communities

Next privilege

Next badge

332 Bookmarks

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

Why is 1-ethylidene-4-methylcyclohexane chiral?

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

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

What are the criteria for a molecule to be chiral?

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

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

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

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

Why is chemistry unpredictable?

Resources for learning Chemistry

Abbreviations in electronic configurations

Infinite Increase in Entropy when Energy added to Absolute Zero

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

What's the energy density of liquid nitrogen?

Is the Henderson–Hasselbalch equation volume independent?

Diatomic halogens - bond strength

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

Why does F replace the axial bond in PCl5?

Why six C atoms are usually seen in cyclic compounds?

Does fluorine ever form a double or triple bond?

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

Are precipitations exothermic and/or endothermic?

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

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

Question about null space balancing method

Reactions between enantiomers in a racemic mixture

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

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

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