The naming of molecules and elements, usually according to IUPAC standards, but also the accepted uses of traditional ones.

learn more… | top users | synonyms

6
votes
1answer
37 views

What does a square mean in a chemical formula?

We find in the book Minerals and their Localities by Jan H Bernard and Jaroslav Hyrsl several chemical formulas containing a square. What does this square means? An example: Franciscanite $\ce{Mn3 ...
0
votes
1answer
24 views

Are all carbohydrates a subset of alcohols?

According to the definition, an alcohol is any organic compound in which the hydroxyl functional group (-OH) is bound to a saturated carbon atom. Monosaccharides such as glucose contain ...
1
vote
1answer
43 views

Is it wrong to call carbon dioxide “methanedial”?

Since dialdehydes have a carbonyl group on either end of an alkane, is it reasonable to call carbon dioxide "methanedial", or is it that ethanedial (glyoxal) is the first dialdehyde?
1
vote
1answer
33 views

Name the following coordination complex

What are the IUPAC rules when naming a coordination complex like: $$\ce{[Pt(NH3)4][Pt(NH3)Cl3]}$$ Now according to my textbook, it is named as tetraammineplatinum(II) ...
0
votes
2answers
44 views

Why is this named incorrectly?

In my Ap chem class I got this sheet with the names of a bunch of common polyatomic ions. One of them is named monohydrogen phosphate ($\ce{HPO4^2-}$). In naming, I learned not to use ‘mono-’ if it’s ...
2
votes
1answer
33 views

Molecules Molecules?

Question is simple I was just wondering if for example If I have a water molecule (H2O) and I have hydrochloric acid and they will get bound together, would they become a molecule made of molecules, ...
6
votes
2answers
85 views

IUPAC name for 1,2,3-trichlorocyclopropane?

What is the IUPAC name for the two isomers of 1,2,3-trichlorocyclopropane? Similarly what is the name for isomers of 1,2,3,4-tetrachlorocyclobutane, 1,2,3,4,5-pentachlorocyclopentane, etc? ...
19
votes
3answers
2k views

Why are isotopes of hydrogen the only ones with special names?

Why does no other element but hydrogen get special names for its isotopes?
5
votes
2answers
47 views

Cinnamaldehyde listed as (2E)-3-phenylprop-2-enal , but is the first 2 redundant?

Wikipedia lists the molecule as being named "(2E)-3-phenylprop-2-enal", however it would appear that, as there is only 1 double bond which has a possibility of stereoisomerism, the 2 is redundant. ...
0
votes
1answer
16 views

IUPAC nomenclature: putting the number before or in the middle of the name

Which is preferred according to "strict" IUPAC: 2-pentanone or pentan-2-one ?
4
votes
2answers
59 views

IUPAC name, phthalic anhydride

Could someone help me please (preferably talk me through not just provide the answer) with the IUPAC name of phthalic anhydride? I'm sorry for not posting attempts but I'm afraid I have absolutely no ...
1
vote
1answer
26 views

Confused by Alternate Names

I am highly allergic to propylene glycol and polyethylene glycol. I am finding many hidden sources of both and MANY synonyms for PG and PEG. Is there a practical way to tell how closely related ...
3
votes
2answers
270 views

Why are alkanes also called paraffins?

Why are alkanes also called as paraffins? Is it because they are mainly found from petroleum and natural gas?
6
votes
1answer
91 views

R-S configuration considering stereoisomerism

How do I consider R-S configuration of this compound? On both the sides of carbon, the groups are same. They differ only in the relative position of hydrogen atoms. On what basis do I assign ...
4
votes
2answers
126 views

What is the rationale of the IUPAC name for DDT?

The structure of DDT is One of the benzene molecules should be the parent chain as it has a greater number of carbon atoms than the straight chain (which has just two carbon atoms). Taking benzene ...
5
votes
1answer
158 views

What is the parent chain in a hydrocarbon with two different rings?

There is cyclopentyl attached to one terminal carbon atom and cyclohexyl attached to the other terminal carbon atom and there are three carbon atoms linking them. Since the cyclohexyl ring has the ...
-3
votes
0answers
27 views

Naming substituted cyclic hydrocarbons [duplicate]

Is 2-methylcyclooctane correct? Since it is 5 carbons in the cyclo, it should be 3 + 5 for longest chain? I couldn't find anything on Google, using images, or search, so I assume it’s wrong?
0
votes
1answer
39 views

Are common names of substituents accepted by IUPAC?

Are names of substituents like isopropyl and sec-butyl accepted by IUPAC? Or do we need to name them according to standard IUPAC conventions? (Ex- 1-methylethyl for isopropyl) My book uses common ...
2
votes
1answer
87 views

Which is the correct name: 2,3-dimethyl cyclopentene or 1,5-dimethyl cyclopentene? [duplicate]

According to the lowest locant rule, 2,3-dimethyl cyclopentene should be the correct IUPAC name as the sum of the locants of the substituents(2+3=5) of 2,3-dimethyl cyclopentene is lower than the sum ...
0
votes
2answers
61 views

Assigning locants in halo alkanes/alkenes

In the first example, if you add up the number of carbon which has a substituent, you will get 2+4+4 = 10. However, if you start from left to right, then you'd get 2+2+4=8. Why don't we follow the ...
1
vote
1answer
20 views

Numbering heteroatoms and groups in benzene derivatives

Can someone please explain why the carbon in 8-hydroxyquinoline is numbered 8, while in 1,10-phenanthroline the nitrogens are numbered 1 and 10? I'm counting carbon atoms and just cannot see why the ...
2
votes
1answer
37 views

Why is microcosmic salt called so?

I really see no relation between the terms microcosmic and the salt's structural formula, $\ce{Na(NH4)HPO4.4H2O}$. Devoting sufficient time on Google didn't help at all. Information about the name ...
8
votes
3answers
122 views

Pubchem, Inchi, SMILES, and uniqueness

Pubchem compound 6140 is L-phenylalanine in its neutral (not zwitterionic) form. According this PubChem, this molecule has the following SMILES and InChI indentifiers: Smiles: ...
0
votes
1answer
41 views

What is the main difference between Quantum Clusters and Nanoclusters? [closed]

I know that Quantum Dots have high quantum yield and ranges from 2nm-10nm, and Nanoclusters have high fluorescence and ranges from 1nm-10nm. But the difference between them is that Quantum Dots ...
1
vote
1answer
89 views

What is the rule for the punctuation marks for a bicyclo compound?

What is the rule for the punctuation marks within the bracketed figures for a bicyclo compound? Is it a 'dot' or 'comma'? In some books there are commas whereas dots in some others.
7
votes
2answers
90 views

Correctness of writing H3C as opposed to CH3 in a carbon chain

I have been studying alkanes, alkenes & alkenes 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 ...
0
votes
1answer
56 views

IUPAC nomenclature

Can $\ce{Ph-CH2-Ph}$ be also be named as as (phenyl methyl) benzene instead of diphenyl methane? I came to this thinking that $\ce{CH2-Ph}$ can be considered as side chain at side chain.
0
votes
1answer
56 views

Problem with naming an alkene

While reading this topic, I've found that alkene are named using cis-trans or using -ene. What will be the name of this compound $\ce{CH3CH=CHCH3}$ according to the rules of IUPAC? Is it bute-2-ene ...
8
votes
2answers
182 views

How to name the following alcohol?

I added a branch to the example shown in the textbook. What do you do when your longest carbon chain has a $\ce{CH2Cl}$ attached to a certain carbon? Previously the book treated it as a methyl group ...
5
votes
1answer
357 views

Why is the IUPAC name of glycerol expressed in the way that it is?

I have come across the name trihydroxy propane for glycerol, which I think should've been Propan-1,2,3-triol. Why is it named this way? Is there any other rule of nomenclature working?
3
votes
1answer
89 views

Oxidation of Carbon atom in Alkene, Alkyne and Alkanes of functional groups?

Nomenclature priorities are in order of the degree of oxidation of the carbon atom. I am not sure if it's advisable to just take it as it is and use it or try to understand the basis of the ...
6
votes
1answer
77 views

Why are 'sec-' and 'tert-' prefixes printed in italics?

While reading about nomenclature of branched alkyl groups, I read that certain common names are also approved by IUPAC. Among those names, only few prefixes are italicised (namely sec- and tert-) and ...
1
vote
1answer
27 views

Naming of substituted amines and amides

While naming substituted amines and amides, should we consider the "N" while deciding the order of substituents or simply place the substituents attached to nitrogen in the beginning? E.g. Should the ...
0
votes
1answer
64 views

Is the compound named correctly?

I guess the ethyl group should be in the parent chain and the numbring should start from right. Hence, the compound should be named 2-methylhept-1-ene-1,3,4,5-tetracarbonitrile. Am I wrong somewhere?
2
votes
1answer
177 views

Is 3,5-diethyltoluene an accepted IUPAC name?

My book says that Monocyclic substituted hydrocarbons are named as derivatives of benzene or compounds like cumene, toluene, xylene, etc. However, if the substituent introduced into such a ...
6
votes
1answer
59 views

Nomenclature of alkoxy and halo groups

CH3-O-CH2CH2Cl How will this compound be named? Both, methoxy and chloro are given equal preference, since they are prefix functional groups. The answer given in the book is ...
3
votes
2answers
98 views

“Amino Acid”, question about name

When learning about amino acids, the primary things that were pointed out were that they had an amino group and a carboxyl group, and side chain that varies from one to the other. The amino group of ...
2
votes
1answer
112 views

Nomenclature of ether and locant position enumeration

Being a functional group, ethoxy should be given locant position 1, and hence this should be named 1-Ethoxy-2,2-dimethylcyclohexane. But, the correct name is 2-Ethoxy-1,1-dimethylcyclohexane. Can ...
-1
votes
1answer
90 views

Calculate the valence of Fe2O3 [duplicate]

$$\ce{FeO}$$ Is called "Iron(II) oxide ". $$\ce{Fe_2O_3}$$ Is called "Iron(III) oxide ". The number in the parenthesis is "Valence" of the substance. Frankly, I don't know how to calculate such ...
1
vote
2answers
73 views

Calculating valence of oxides

Learning about Oxides. Basically when oxygen is combined with a metal. $$\ce{FeO}$$ This is called "Iron Oxide (II)" according to my book. Apparently, the II represents the valence. But how come? ...
1
vote
2answers
54 views

Nomenclature of MnO4 -: is it an oxyanion?

Having a real pain with nomenclature. Look at this substance: $$\ce{MnO_4^{-}}$$ So, we got an anion of Manganese and Oxygen (or is that just an anion of Oxygen?). Anyway, my book says that ...
6
votes
2answers
131 views

When to use -ate and -ite for naming oxyanions?

I'm now learning about nomenclature. In particular, oxyanions. Basically, when you have an anion that is a combination of a non-metal with oxygen. According to my book: It ends with -ate for the ...
3
votes
1answer
46 views

Who devised the term elements?

Who devised the term elements? Who was the one who brought the term elements to us? Also please give a bit information on background of the man.
5
votes
0answers
39 views

Have P-acyl phosphines ever been synthesized?

I've done some amount of searching and can't seem to find any evidence in the literature that there exists a phosphine analogue of carboxyl amides. I'm looking for compounds of the form $ \ce{ ...
2
votes
1answer
704 views

Vinegar CH2O ? COH2

we must write empirical formula of $\ce{CH3COOH}$ as $\ce{CH2O}$ or $\ce{COH2}$ ? Alike ? Any nomenclature? Somebody told me it was because of bonding, different way of writing the chemical formula ...
2
votes
1answer
67 views

Are all complexes with a polydentate ligand examples of chelation?

I'm getting a little confused about the definition of chelation and its implications (I should probably point out I'm only an A2 Chemistry student). The IUPAC defines chelation as the following: ...
0
votes
0answers
23 views

Where does the prefix “Bi-” come from in Sodium Bi-carbonate? [duplicate]

Sodium Carbonate has two sodium ions on each carbonate entity, which is has both protons replace by the two sodium cations. Sodium Bicarbonate has one proton and one sodium cation on each carbonate. ...
3
votes
2answers
63 views

Naming double bond sidechain [duplicate]

In IUPAC naming double bonds take preference over an alkane chain of any length, right? So the above should be named as 2-ethylnon-1-ene. However, when I verify ...
7
votes
2answers
302 views

Does the term 'silver nitrate' express all of its constituent chemical elements?

My professor gave my class a set of practice questions for the mid-term. One of those questions asks for the molar mass of a number of chemicals, such as lithium bromide and silver nitrate. We haven't ...
3
votes
1answer
71 views

Why is the gram no longer a function of the atomic mass number?

According to Wikipedia, ... the definition of the gram is not (as of 2011) mathematically tied to that of the atomic mass unit Why did we change that?