User Karsten Theis

63 votes

Accepted

Why is '-ethane' in 'methane'?

answered Nov 17, 2020 at 20:01

35 votes

Why was Avogadro's number chosen to be the value that it is?

physical-chemistry mole history-of-chemistry

answered Apr 7, 2020 at 14:02

25 votes

Accepted

Is it possible to create hydrophobic water?

physical-chemistry

answered Jul 5, 2021 at 13:56

24 votes

Accepted

Is there a difference between equilibrium and steady state?

equilibrium kinetics terminology

answered Mar 11, 2019 at 4:46

22 votes

Accepted

How were x-ray diffraction patterns deciphered before computers?

crystallography x-ray-diffraction light

answered Aug 3, 2019 at 3:13

18 votes

Which atom is the smallest atom?

electrons atoms periodic-trends atomic-structure atomic-radius

answered Oct 2, 2021 at 13:04

18 votes

Accepted

Quadrupole moment of a molecule

physical-chemistry polarity

answered Jan 27, 2019 at 15:48

16 votes

Why does a tetrahedral molecule like methane have a dipole moment of zero?

inorganic-chemistry bond

answered Jul 18, 2019 at 14:44

16 votes

What is kekulization (in RDKit)?

molecules cheminformatics

answered Jun 7, 2019 at 0:16

15 votes

Accepted

What happens in an exothermic reaction at the atomic level?

thermodynamics

answered Apr 23, 2020 at 11:43

14 votes

Is light a reactant in photochemical reactions?

thermodynamics isomers photochemistry

answered Jan 3, 2021 at 3:32

13 votes

Are pseudo-zeroth order reactions possible?

physical-chemistry kinetics

answered Jul 21, 2021 at 16:43

13 votes

How can you build a model of tetrahedral coordination from objects found at home?

home-experiment molecular-structure

answered Mar 16, 2020 at 17:55

13 votes

Accepted

Distinguishing between octahedral and tetrahedral holes

inorganic-chemistry crystal-structure

answered Sep 8, 2019 at 10:56

13 votes

Accepted

Why does liquid water form when we exhale on a mirror?

physical-chemistry phase

answered Mar 11, 2019 at 4:14

13 votes

Accepted

Pauli exclusion principle

quantum-chemistry molecular-orbital-theory theoretical-chemistry

answered Mar 16, 2019 at 14:16

12 votes

What exactly is temperature?

physical-chemistry thermodynamics heat temperature statistical-mechanics

answered Mar 20, 2020 at 14:44

11 votes

If you accumulate 100 identical spheres how many will end up on the surface?

physical-chemistry crystallography

answered Sep 25, 2020 at 2:23

11 votes

Why do the first and second laws of thermodynamics not contradict each other?

thermodynamics entropy

answered May 12, 2020 at 14:35

11 votes

Why are isotopes an issue in reading mass spectra?

analytical-chemistry mass-spectrometry isotope

answered Jun 11, 2019 at 2:01

10 votes

Where does the energy required to initially begin the reaction of iron and oxygen come from?

energy reactivity iron

answered May 21 at 2:55

10 votes

Does energy come from fuel or oxygen? (surprise?)

organic-chemistry reaction-mechanism thermodynamics energy

answered Jul 18, 2019 at 14:28

10 votes

Accepted

Reaction of phenol and zinc dust

organic-chemistry reaction-mechanism phenols organic-reduction

answered Dec 3, 2019 at 11:19

10 votes

Accepted

How can you use ICE tables to solve multiple coupled equilibria?

equilibrium

answered Mar 15, 2019 at 18:58

9 votes

Why are there exactly 5 types of two-dimensional lattices, and what distinguishes them?

inorganic-chemistry crystal-structure solid-state-chemistry lattices

answered May 23, 2021 at 16:13

9 votes

In sourdough bread baking what do the wild yeast and bacteria not eat during dough fermentation and why?

organic-chemistry biochemistry

answered Mar 25, 2021 at 11:53

9 votes

Accepted

Identify the structure of the compound (C3H5NO) given its NMR chemical shifts

nmr-spectroscopy

answered Nov 11, 2019 at 20:39

9 votes

Which biphenyl is optically active?

organic-chemistry aromatic-compounds stereochemistry molecular-structure molecules

answered Nov 20, 2019 at 20:32

9 votes

DNA pairs (adenine-thymine, guanine-cytosine)

inorganic-chemistry intermolecular-forces chemical-biology

answered Sep 3, 2019 at 22:11

8 votes

What organic molecule, if any, does this diagram represent in Louis CK's "Louie" Season Four, Episode Eleven, just before the six minute mark?

organic-chemistry identification

answered Jan 23 at 23:04

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805 Answers

Why is '-ethane' in 'methane'?

Why was Avogadro's number chosen to be the value that it is?

Is it possible to create hydrophobic water?

Is there a difference between equilibrium and steady state?

How were x-ray diffraction patterns deciphered before computers?

Which atom is the smallest atom?

Quadrupole moment of a molecule

Why does a tetrahedral molecule like methane have a dipole moment of zero?

What is kekulization (in RDKit)?

What happens in an exothermic reaction at the atomic level?

Is light a reactant in photochemical reactions?

Are pseudo-zeroth order reactions possible?

How can you build a model of tetrahedral coordination from objects found at home?

Distinguishing between octahedral and tetrahedral holes

Why does liquid water form when we exhale on a mirror?

Pauli exclusion principle

What exactly is temperature?

If you accumulate 100 identical spheres how many will end up on the surface?

Why do the first and second laws of thermodynamics not contradict each other?

Why are isotopes an issue in reading mass spectra?

Where does the energy required to initially begin the reaction of iron and oxygen come from?

Does energy come from fuel or oxygen? (surprise?)

Reaction of phenol and zinc dust

How can you use ICE tables to solve multiple coupled equilibria?

Why are there exactly 5 types of two-dimensional lattices, and what distinguishes them?

In sourdough bread baking what do the wild yeast and bacteria not eat during dough fermentation and why?

Identify the structure of the compound (C3H5NO) given its NMR chemical shifts

Which biphenyl is optically active?

DNA pairs (adenine-thymine, guanine-cytosine)

What organic molecule, if any, does this diagram represent in Louis CK's "Louie" Season Four, Episode Eleven, just before the six minute mark?