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Chemistry
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organic-chemistry

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1,386 posts edited
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7,332 votes cast
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271 Favorites

Added Views Newest Activity Votes
201
votes
3
answers
26k
views

Why is gold golden?

inorganic-chemistry theoretical-chemistry color relativistic
Dec 16 '17 at 15:14 Jan 54.2k
193
votes
1
answer
39k
views

Why can we smell copper?

everyday-chemistry metal transition-metals smell
Apr 17 '18 at 9:42 Archer 4,072
168
votes
8
answers
135k
views

Can an atom have more than 8 valence electrons? If not, why is 8 the limit?

physical-chemistry electrons electronic-configuration valence-bond-theory
Dec 15 '17 at 20:44 Oscar Lanzi 20k
103
votes
8
answers
57k
views

Is a negative pH level physically possible?

acid-base equilibrium ph
Aug 10 at 8:56 Loong♦ 38.1k
91
votes
5
answers
68k
views

How do you melt metals with super high melting points?

melting-point
Mar 15 '17 at 6:35 KyleCPM 1
76
votes
7
answers
112k
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
May 29 '14 at 12:00 Community♦ 1
72
votes
3
answers
30k
views

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

theoretical-chemistry bond molecular-orbital-theory covalent-compounds
Jun 4 at 12:42 Tan Yong Boon 7,549
70
votes
2
answers
26k
views

What is Bent's rule?

bond orbitals hybridization stereochemistry valence-bond-theory
Oct 21 '16 at 22:54 Community♦ 1
63
votes
4
answers
18k
views

How does Walter White make pure crystal meth using a non-stereospecific reaction?

reaction-mechanism stereochemistry chemistry-in-fiction
Aug 15 at 19:14 orthocresol♦ 47.2k
60
votes
4
answers
28k
views

Why do elements in columns 6 and 11 assume 'abnormal' electron configurations?

orbitals electronic-configuration transition-metals
Jan 30 at 12:46 Martin - マーチン♦ 36.9k
56
votes
4
answers
41k
views

How can one explain niobium’s weird electronic configuration?

electronic-configuration transition-metals
Aug 22 at 15:31 shibu sarkar 1
54
votes
4
answers
190k
views

Why add water first then acid?

acid-base experimental-chemistry safety
May 17 at 6:42 Melanie Shebel♦ 5,915
51
votes
5
answers
9k
views

The last element's atomic number

physical-chemistry atoms nuclear elements
Jan 21 '18 at 17:44 Tyberius 8,643
51
votes
3
answers
7k
views

Why do we write NH3?

inorganic-chemistry nomenclature
Feb 11 '16 at 17:47 Loong♦ 38.1k
50
votes
2
answers
50k
views

What makes some metals melt at higher temperature?

melting-point metal
Sep 14 at 11:34 Community♦ 1
49
votes
1
answer
9k
views

Why does menthol (e.g. peppermint) feel cool to the tongue?

biochemistry
Oct 19 '15 at 14:04 Community♦ 1
43
votes
4
answers
37k
views

Why do the names of most chemical elements end with -um or -ium?

nomenclature elements
Mar 21 '17 at 14:52 Supernova 1,267
41
votes
4
answers
6k
views

What is more acidic: D3O+ in D2O or H3O+ in H2O and why?

acid-base kinetics isotope
Jun 19 at 22:28 Mathew Mahindaratne 12.7k
41
votes
3
answers
7k
views

Carbon atoms at the edge of a diamond

crystal-structure hybridization
Apr 22 at 14:43 Jaimes Beam 1
41
votes
1
answer
4k
views

Why is methane's molecular formula conventionally “CH₄”, while water is “H₂O” (among others)?

nomenclature notation
Feb 21 '15 at 22:27 ron 74.6k
41
votes
5
answers
45k
views

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

bond periodic-trends hybridization molecular-structure
Jan 21 at 23:29 Andrew 2,545
40
votes
1
answer
82k
views

Differences between phenols and alcohols

organic-chemistry alcohols phenols
Nov 5 at 23:00 Mathew Mahindaratne 12.7k
39
votes
3
answers
102k
views

What is the inert pair effect?

inorganic-chemistry quantum-chemistry orbitals periodic-trends relativistic
Mar 1 '18 at 18:48 pentavalentcarbon 6,659
39
votes
5
answers
6k
views

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

bond quantum-chemistry molecular-orbital-theory
Dec 27 '18 at 12:46 Tan Yong Boon 7,549
39
votes
3
answers
12k
views

Why do impurities lower the melting point of an isolated substance?

thermodynamics mixtures melting-point
Dec 14 '15 at 12:19 M.A.R. 9,286
39
votes
5
answers
32k
views

Is there any substance that's a 4-4-4 on the NFPA diamond?

safety toxicity
Oct 17 '17 at 3:09 andselisk♦ 25.2k
38
votes
2
answers
6k
views

Why is arsenous acid denoted H3AsO3?

inorganic-chemistry acid-base nomenclature
Mar 19 at 4:32 A.K. 11.1k
37
votes
4
answers
41k
views

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

acid-base ph
Dec 3 at 21:49 G M 7,697
35
votes
2
answers
41k
views

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

organic-chemistry nucleophilic-substitution
Oct 25 '18 at 23:48 orthocresol♦ 47.2k
35
votes
2
answers
17k
views

How can the dipole moment of carbon monoxide be rationalised by molecular orbital theory?

bond theoretical-chemistry molecular-orbital-theory
Feb 6 '18 at 23:12 Jingjie YANG 313
1 2 3 4 5 … 10 next
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