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Chemistry

Proposed Q&A site for scientists, academics, teachers and students
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26 Example Questions

newest all votes on-topic off-topic
10 great on-topic example
0 great off-topic example
0 not a good example
What chemical reactions occurs when you put mentos into a coke?
added by googletorp Jun 9 at 9:18
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0 great on-topic example
9 great off-topic example
0 not a good example
How accurate is carbon dating?
added by The Night Rider Jun 10 at 1:41
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Off topic — same reason as area51.stackexchange.com/proposals/4964/chemistry/…. – KennyTM Jun 10 at 10:11
0 great on-topic example
8 great off-topic example
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What's a photon?
added by googletorp Jun 9 at 9:20
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Off-topic, photons are not explained with chemistry, the use or observation of photons in a chemical reaction would be on-topic. – googletorp Jun 9 at 9:21
This would be more physics-related than chemistry. area51.stackexchange.com/proposals/1908/physics – Vortico Jun 10 at 19:45
@Vortica Since it's a very fundamental question I'd prefer it on Popular Natural Science area51.stackexchange.com/proposals/4955/… – Tobias Kienzler Jun 11 at 7:32
8 great on-topic example
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Why is water such an effective solvent?
added by Robert Harvey Jun 9 at 22:36
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0 great on-topic example
7 great off-topic example
0 not a good example
Why all isotopes of technetium are radioactive?
added by KennyTM Jun 9 at 13:25
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Radioactivity by itself is not a chemistry question. – googletorp Jun 9 at 22:14
it's rather (nuclear) physics. And to date not entirely answerable – Tobias Kienzler Jun 10 at 7:38
I would argue that this can still be considered chemistry, since many people specifically design molecules with certain isotopes for various purposes in chemistry. Definitely a great "off-topic" example though – David Hollman Aug 31 at 14:24
1 great on-topic example
5 great off-topic example
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What is the [boiling point] of 22-Dihydroergocalciferol?
added by KennyTM Jun 9 at 15:33
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or Acidity, etc. The main point is whether question that simply asks a property of a chemical is allowed. – KennyTM Jun 9 at 15:36
We don't want to make an encyclopedia. – googletorp Jun 9 at 22:13
0 great on-topic example
6 great off-topic example
4 not a good example
How to know when you have good chemistry with your {boyfriend/girlfriend}?
added by Binoj Antony Jun 17 at 10:08
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Intended as off topic. – Binoj Antony Jun 17 at 10:09
avoid silly off topic questions, add only those that are probably asked in the site – Louis Rhys Aug 23 at 7:02
this is a bit ridiculous.... – David Hollman Aug 31 at 13:36
4 great on-topic example
1 great off-topic example
0 not a good example
Most metals are silver-coloured, so why is gold yellow and copper red?
added by The Night Rider Jun 10 at 1:39
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Has to do with electron shell configuration. Quantum dynamics and particle physics perhaps? – Koning Baard Aug 14 at 17:40
5 great on-topic example
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Have any new chemical elements been found (past 119) ?
added by rlb.usa Jun 10 at 16:27
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119 isn't produced yet. – KennyTM Jun 11 at 19:31
4 great on-topic example
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How are organic substances named?
added by Tobias Kienzler, edited by Robert Harvey Jun 22 at 23:38
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e.g. methane, ethanol, ... – Tobias Kienzler Jun 9 at 9:52
3 great on-topic example
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How do orbitals help explain chemical reactions?
added by Robert Harvey Jun 9 at 22:37
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A better question would be how orbitals explain the structure of a molecule. – googletorp Jun 10 at 7:56
@googletorp: If you know enough to ask the question that precisely, do you really need an answer? – Robert Harvey Jun 22 at 23:37
@Robert Harvey These questions is not about getting an answer on something you don't know, but defining the Q&A site to be. – googletorp Jun 23 at 5:53
3 great on-topic example
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What's the strength and weaknesses of the LCAO method for calculating molecular orbitals?
added by googletorp Jun 10 at 7:54
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3 great on-topic example
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Why does 1 cup of water + 1 cup of alcohol produce less than 2 cups of solution?
added by dthorpe Aug 13 at 0:24
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2 great on-topic example
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How does soap make dirt/oils wash away in water?
added by dthorpe Aug 13 at 0:32
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this is a question for popular natural science. The point of this SE is for advanced level chemistry. – Stefano Borini Aug 13 at 9:23
@Stefano I agree. Here's a link: Popular Natural Sciences (disclaimer it's my referral link..) – Tobias Kienzler Aug 13 at 10:19
So, the action of lipids as emulsifiers is popular natural science, but mentos in diet coke is advanced level chemistry? – dthorpe Aug 13 at 22:35
2 great on-topic example
0 great off-topic example
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How exactly does [fire] work, chemically?
added by rlb.usa Jun 10 at 16:27
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I'd think fire is rather physically. But Physical Chemistry might cover it, too – Tobias Kienzler Jun 11 at 7:24
2 great on-topic example
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How do you calculate the pH value of a solution containing many acids and bases?
added by googletorp Jun 17 at 10:53
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Just the average – Koning Baard Aug 14 at 17:41
2 great on-topic example
0 great off-topic example
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What does chemical formula 'La_1.85 Ba_0.15 Cu O_4' mean? Why are there decimal numbers?
added by KennyTM Jun 24 at 19:09
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Note: it's a kind of high-Tc superconductor. – KennyTM Jun 24 at 19:10
1 great on-topic example
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How can you determine if two liquids will mix or be separated into phases?
added by googletorp Jun 9 at 9:16
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1 great on-topic example
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What is the chemical process used to refine raw (brown) sugar to produce white sugar?
added by dthorpe Aug 5 at 23:41
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1 great on-topic example
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What are the basic safety rules for storing chemicals at home, garage, classroom, etc? (Is it ok to store X in the same cabinet as Y?)
added by dthorpe Aug 5 at 23:43
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1 great on-topic example
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How is fortran better than other programming languages for chemistry related calculus?
added by JMin Aug 20 at 21:52
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This would probably be a good topic for the proposed Computational Chemistry site – David Hollman Aug 31 at 14:26
Thanks, David. I joined the proposal : ). It'd be great to have some place to post all the questions I can't get answers for in class. – JMin Sep 1 at 21:43
0 great on-topic example
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What's the origin of orbitals?
added by Tobias Kienzler Jun 9 at 9:53
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Do you include physical chemistry or should this be asked on physics area51.stackexchange.com/proposals/1908/physics ? – Tobias Kienzler Jun 9 at 9:53
This question is a bit loose, would be better to ask a question like: which methods are used to calculate electron orbitals in atoms and molecules? – googletorp Jun 9 at 9:56
Quantum mechanics and physical chemistry belongs to this area. As long as the goal is to gain a better understanding of chemistry, how molecules react, placement of electrons etc, is within the subject. – googletorp Jun 9 at 9:58
quantum chemistry is definitely chemistry. – Stefano Borini Aug 13 at 9:24
0 great on-topic example
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Why is alcohol often a better solvent for organic compounds than water?
added by dthorpe Aug 13 at 0:25
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Thinking specifically of essence extraction and distillation: flavoring extracts (vanilla, orange, etc) are almost always alcohol based. – dthorpe Aug 13 at 0:28
0 great on-topic example
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What is the difference in properties between different carbon-halogen bonds?
added by Koning Baard Aug 14 at 17:37
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0 great on-topic example
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why do solid substances have different colours? what determines their colours?
added by Louis Rhys Aug 23 at 10:20
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Duplicate / generalization of the "why is gold yellow and copper red?" question. – dthorpe Aug 23 at 17:15
0 great on-topic example
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How do I use an arbitrary basis set with Q-Chem 3.2?
added by David Hollman Aug 31 at 13:39
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Or should this be moved to a new proposed site for computational chemistry? – David Hollman Aug 31 at 13:40

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