User Nicolau Saker Neto

106 votes

5 answers

83k views

How do you melt metals with super high melting points?

melting-point

Griffin

1,183

asked Sep 23, 2014 at 14:16

92 votes

2 answers

36k views

What is Bent's rule?

Dissenter

17.9k

asked Aug 26, 2014 at 18:37

90 votes

7 answers

130k views

Why is the 2s orbital lower in energy than the 2p orbital when the electrons in 2s are usually farther from the nucleus?

energy electrons quantum-chemistry orbitals

Gordon Gustafson

1,707

asked Apr 28, 2012 at 22:14

79 votes

4 answers

39k views

Bonding in diatomic C2, a carbon-carbon quadruple bond?

theoretical-chemistry bond molecular-orbital-theory covalent-compounds

Janice DelMar

6,016

asked Jun 5, 2012 at 1:32

73 votes

3 answers

17k views

Could a magnet pull oxygen out of the air?

magnetism

Rob N

1,599

asked Jul 15, 2015 at 0:05

70 votes

3 answers

9k views

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

bond coordination-compounds transition-metals hybridization

Arishta

3,929

asked Jun 24, 2017 at 15:54

66 votes

1 answer

10k views

Why does F replace the axial bond in PCl5?

molecular-structure halides hybridization valence-bond-theory

Shubham

1,417

asked Oct 14, 2014 at 9:21

64 votes

3 answers

21k views

Why doesn't H₄O²⁺ exist?

ions stability

Sanom Dane

814

asked Apr 3, 2019 at 15:39

59 votes

4 answers

17k views

Are diamonds really forever?

carbon-allotropes pressure

HyperLuminal

2,179

asked Jul 19, 2015 at 23:52

55 votes

6 answers

11k views

The last element's atomic number

physical-chemistry atoms nuclear elements

Devgeet Patel

1,222

asked Jan 26, 2014 at 12:52

51 votes

5 answers

9k views

How can antibonding orbitals be more antibonding than bonding orbitals are bonding?

bond quantum-chemistry molecular-orbital-theory

stochastic13

6,455

asked Mar 31, 2013 at 3:20

49 votes

3 answers

4k views

Unit of the equilibrium constant: contradiction of Bridgman's theorem?

physical-chemistry thermodynamics

John Gowers

593

asked Aug 7, 2013 at 12:20

49 votes

3 answers

23k views

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

organic-chemistry stability carbocation

Shubham

1,417

asked Nov 3, 2014 at 7:01

49 votes

2 answers

27k views

Why is an S-S bond stronger than an O-O bond?

inorganic-chemistry bond molecules

M.A.R.

10.2k

asked Feb 27, 2016 at 16:32

48 votes

3 answers

4k views

What happens to a radioactive carbon dioxide molecule when its carbon-14 atom decays?

radioactivity atmospheric-chemistry

Marcel

1,294

asked Jan 6, 2017 at 10:20

48 votes

4 answers

8k views

What is resonance, and are resonance structures real?

resonance valence-bond-theory

bon

15k

asked May 23, 2016 at 17:03

48 votes

3 answers

8k views

Is buckminsterfullerene aromatic?

organic-chemistry carbon-allotropes aromaticity

M.A.R.

10.2k

asked Sep 20, 2015 at 19:41

48 votes

5 answers

82k views

Why does bond angle decrease in the order H2O, H2S, H2Se?

bond periodic-trends hybridization molecular-structure

Yomal Amarathunge

1,247

asked Aug 7, 2014 at 6:29

47 votes

1 answer

7k views

What's the biggest organic molecule that could have a smell?

organic-chemistry smell

pentane

533

asked Sep 10, 2019 at 2:50

45 votes

4 answers

49k views

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

acid-base ph

Eliza

2,359

asked Jan 25, 2014 at 17:49

43 votes

3 answers

5k views

Do molecules with bridges through rings exist?

organic-chemistry bond synthesis molecular-structure molecules

schuelermine

583

asked Feb 29, 2020 at 22:10

42 votes

6 answers

8k views

Can an atom bond with more than 8 other atoms?

bond electronic-configuration coordination-compounds

Anoneemus

971

asked May 24, 2015 at 16:56

41 votes

7 answers

37k views

Is there any chemical that can destroy PTFE or Teflon?

polymers

HyperLuminal

2,179

asked Jul 19, 2015 at 22:08

40 votes

3 answers

36k views

What is the difference between ∆G and ∆G°?

thermodynamics equilibrium free-energy

Vieri_Wijaya

491

asked Dec 8, 2015 at 13:37

40 votes

3 answers

2k views

Is Hexafluorocyclohexane the "Most Polar" Small Molecule?

organic-chemistry reference-request dipole

Geoff Hutchison

27k

asked Aug 20, 2015 at 20:43

40 votes

2 answers

62k views

Why do SN1 and SN2 reactions not occur at sp2 centres?

organic-chemistry nucleophilic-substitution

Jordan Barnes

555

asked Jul 20, 2014 at 14:09

39 votes

1 answer

11k views

Can 100% covalent bonds exist?

bond ionic-compounds covalent-compounds

Gerard

3,353

asked Jun 1, 2015 at 13:37

38 votes

5 answers

6k views

How do I visualize an atom?

atoms orbitals

Vatsal Manot

686

asked Jul 14, 2015 at 12:50

38 votes

10 answers

7k views

Why is chemistry unpredictable?

physical-chemistry experimental-chemistry theoretical-chemistry process-chemistry

Tyler M

475

asked Oct 19, 2020 at 14:56

36 votes

2 answers

2k views

IUPAC nomenclature for an interesting looking organic compound

organic-chemistry nomenclature aromatic-compounds

Panglossian Oporopolist

471

asked Feb 16, 2016 at 13:54

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How do you melt metals with super high melting points?

What is Bent's rule?

Why is the 2s orbital lower in energy than the 2p orbital when the electrons in 2s are usually farther from the nucleus?

Bonding in diatomic C2, a carbon-carbon quadruple bond?

Could a magnet pull oxygen out of the air?

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

Why does F replace the axial bond in PCl5?

Why doesn't H₄O²⁺ exist?

Are diamonds really forever?

The last element's atomic number

How can antibonding orbitals be more antibonding than bonding orbitals are bonding?

Unit of the equilibrium constant: contradiction of Bridgman's theorem?

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

Why is an S-S bond stronger than an O-O bond?

What happens to a radioactive carbon dioxide molecule when its carbon-14 atom decays?

What is resonance, and are resonance structures real?

Is buckminsterfullerene aromatic?

Why does bond angle decrease in the order H2O, H2S, H2Se?

What's the biggest organic molecule that could have a smell?

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

Do molecules with bridges through rings exist?

Can an atom bond with more than 8 other atoms?

Is there any chemical that can destroy PTFE or Teflon?

What is the difference between ∆G and ∆G°?

Is Hexafluorocyclohexane the "Most Polar" Small Molecule?

Why do SN1 and SN2 reactions not occur at sp2 centres?

Can 100% covalent bonds exist?

How do I visualize an atom?

Why is chemistry unpredictable?

IUPAC nomenclature for an interesting looking organic compound