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Chemistry
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M.A.R.

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organic-chemistry

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Impact

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1,380 posts edited
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7,447 votes cast
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277 Bookmarks

Votes Activity Newest Views Added
222
votes
3
answers
30k
views

Why is gold golden?

inorganic-chemistry theoretical-chemistry color relativistic
Jun 5 at 14:45 Mathew Mahindaratne 26.2k
211
votes
1
answer
60k
views

Why can we smell copper?

everyday-chemistry metal transition-metals smell
Apr 17 '18 at 9:42 Archer 4,560
170
votes
8
answers
147k
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 27k
108
votes
8
answers
63k
views

Is a negative pH level physically possible?

acid-base equilibrium ph
Aug 10 '19 at 8:56 Community♦ 1
96
votes
5
answers
77k
views

How do you melt metals with super high melting points?

melting-point
Mar 15 '17 at 6:35 KyleCPM 1
83
votes
7
answers
121k
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
Dec 24 '19 at 6:20 Community♦ 1
81
votes
2
answers
31k
views

What is Bent's rule?

bond orbitals hybridization stereochemistry valence-bond-theory
Oct 21 '16 at 22:54 Community♦ 1
74
votes
4
answers
35k
views

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

theoretical-chemistry bond molecular-orbital-theory covalent-compounds
Jun 13 at 14:57 Mathew Mahindaratne 26.2k
64
votes
4
answers
30k
views

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

orbitals electronic-configuration transition-metals
Dec 24 '19 at 6:28 Community♦ 1
64
votes
4
answers
19k
views

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

reaction-mechanism stereochemistry chemistry-in-fiction
Aug 15 '19 at 19:14 orthocresol♦ 56k
60
votes
4
answers
49k
views

How can one explain niobium’s weird electronic configuration?

electronic-configuration transition-metals
Aug 22 '19 at 15:31 shibu sarkar 1
57
votes
4
answers
213k
views

Why add water first then acid?

acid-base experimental-chemistry safety
May 17 '19 at 6:42 Melanie♦ 6,184
54
votes
3
answers
9k
views

Why do we write NH3?

inorganic-chemistry nomenclature
Feb 11 '16 at 17:47 Community♦ 1
52
votes
2
answers
53k
views

What makes some metals melt at higher temperature?

melting-point metal
Dec 24 '19 at 7:10 Mathew Mahindaratne 26.2k
52
votes
5
answers
10k
views

The last element's atomic number

physical-chemistry atoms nuclear elements
Jan 21 '18 at 17:44 Tyberius 10k
49
votes
1
answer
10k
views

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

biochemistry
Oct 19 '15 at 14:04 Community♦ 1
45
votes
5
answers
69k
views

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

bond periodic-trends hybridization molecular-structure
Jan 21 '19 at 23:29 Andrew 5,855
44
votes
4
answers
46k
views

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

nomenclature elements
Mar 21 '17 at 14:52 Community♦ 1
42
votes
5
answers
7k
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 8,494
41
votes
1
answer
5k
views

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

nomenclature notation
Feb 21 '15 at 22:27 ron 78.1k
41
votes
3
answers
8k
views

Carbon atoms at the edge of a diamond

crystal-structure hybridization
Apr 22 '19 at 14:43 Jaimes Beam 1
41
votes
5
answers
41k
views

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

safety toxicity
Oct 17 '17 at 3:09 andselisk♦ 31.7k
41
votes
4
answers
7k
views

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

acid-base kinetics isotope
Jun 19 '19 at 22:28 Mathew Mahindaratne 26.2k
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 8,579
40
votes
3
answers
5k
views

Do molecules with bridges through rings exist?

organic-chemistry molecular-structure molecules
Jun 30 at 11:23 Mathew Mahindaratne 26.2k
40
votes
1
answer
87k
views

Differences between phenols and alcohols

organic-chemistry alcohols phenols
Nov 5 '19 at 23:00 Community♦ 1
40
votes
3
answers
13k
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. 9,660
39
votes
3
answers
107k
views

What is the inert pair effect?

inorganic-chemistry quantum-chemistry orbitals periodic-trends relativistic
Mar 1 '18 at 18:48 pentavalentcarbon 7,091
38
votes
2
answers
7k
views

Why is arsenous acid denoted H3AsO3?

inorganic-chemistry acid-base nomenclature
Mar 19 '19 at 4:32 A.K. 11.4k
38
votes
4
answers
8k
views

What exactly is happening when sodium, potassium, or other alkali metal explodes in water?

physical-chemistry reaction-mechanism explosives
Jul 7 at 16:57 Mathew Mahindaratne 26.2k
1
2 3 4 5
…
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