All Questions
Tagged with notation nomenclature
13 questions
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What does $n$ represent in "hydrated compound⋅nH2O"? [closed]
On Wikipedia it is written that in "hydrated compound⋅nH2O" $n$ is the number of water molecules per formula unit of the salt. I don't understand what that means and this is indicated in ...
- 242
5
votes
1
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110
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Symbol to denote a group which is either an oxygen atom or NH group
I'm drawing the generic structure of several different organic molecules in my thesis. They share some features, one of which is a carbonyl carbon attached to either an oxygen atom (i.e. ester) or an $...
- 215
13
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3
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What does a comma signify in inorganic chemistry?
$\ce{(Ca{,}Co)CO3}$
I have never ever seen this before. What does this mean exactly?
- 147
2
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1
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94
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Using Roman Numerals to indicate a compound
I don't completely understand it's use. Here's an example I don't understand:
Shortly after discussing $\ce{[CuCl4]^2-}$, an exam paper asked a question about copper(II) chloride. I understand that ...
- 139
5
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1
answer
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Is it wrong to write a coefficient of 1 in a chemical equation?
Take $$\ce{2H2 + O2 -> 2H2O}$$
Is it wrong to write $$\ce{2H2 + 1O2 -> 2 H2O}$$
By wrong I mean that it is against a widely accepted guideline (those of the IUPAC?), not just "your teacher said ...
- 161
10
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1
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448
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What is the correct way to notate conformation preferences of polysaccharides?
In some webpages (1 or 2) are found the way to notate the conformational preferences of monosaccharides such as furanose and pyranose.
But, it lacks to give a brief description on how to do it with ...
- 2,630
9
votes
1
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687
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How to accurately abbreviate solvents?
IUPAC Red Book in section IR-4.4.4 Ligand abbreviations [1, p. 63] states the following:
N.B. Abbreviations for solvents that behave as ligands should also be in lower case letters [e.g. dmso for ...
- 38.5k
7
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2
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Hyphenation of chemical names
When a word has to be split broken into multiple lines, it is almost always hyphenated. Chemical names can be considered words, or at least they consist of words. So the hyphenation should apply to ...
- 6,262
3
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3
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Drawing the condensed structure of ethylcyclobutane
The IUPAC name for this is ethylcyclobutane. I know that the formula is $\ce{C6H12}$.
I have no problems drawing the skeletal structure, but I have a little difficulty drawing the condensed structure....
- 529
12
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2
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Can isotopes of a given element be represented by different symbols?
Can isotopes of any given element be represented using a completely different chemical symbol? What's the IUPAC's take on this?
Sure, ordinarily you would add the isotope's mass as a superscript to ...
- 18.8k
4
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1
answer
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Phase description for a substance dissolved in a solvent other than water?
I'm trying to write an equation for which I have $\ce{CuI}$ dissolved in acetonitrile. Usually if you have a salt dissolved in water you can denote that using $\ce{(aq)}$, but is there a notation for ...
- 24.1k
14
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2
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Correctness of writing H3C as opposed to CH3 in a carbon chain
I have been studying alkanes, alkenes & alkynes for a while, and I see in the examples that all the basic structural formulas start with $\ce{CH3}$, then $\ce{CH2}$, and the last carbon atom is $\...
- 141
44
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1
answer
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Why is methane's molecular formula conventionally "CH₄", while water is "H₂O" (among others)?
While revisiting some of my old notes about the Miller-Urey experiment, I stumbled across the "equation"...
Electricity + $\ce{CH4~/~ NH3~/~H2O~/~CO}$ = Amino Acids
This got me thinking.
...
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