Questions tagged [structural-formula]

This tag should be applied to questions about structural diagrams - diagrams used to show the crude location of possible existent bonds and lone pairs of electrons in a chemical species. Do not use this tag if your question is about Lewis structures, use [lewis-structures] instead.

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5
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1answer
282 views

How can I find out a substance name based on its structural formula?

When visiting a botanical garden in Stockholm, I stumbled across the following mosaic tile: I have tried to identify it using MolView, but it does not seem to identify it. Also, I have tried their ...
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1answer
592 views

Is peroxynitrous acid an isomer of nitric acid?

Structure of nitric acid: Structure of peroxynitrous acid: Nitric acid and peroxynitrous acid have the same structural formula, $\ce{HNO3}$ and in both the compounds, O.N. of nitrogen is +5. So, ...
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Why are there different chemical structures for epinephrine (adrenaline)?

The Wikipedia structure is: Note the empty bond at far-right. "Journals on the Web" has: CH3 added at far-right. And rxlist.com shows: There's an extra H going into the page! Is one of these ...
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1answer
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Explanation of certain chemical bond diagrams

Here's a "simple" bond diagram of 1,1,1,2-Tetrafluoroethane which I believe is a Lewis structure: OK, that's easy enough - four bonds from each carbon atom, and each fluorine atom having one bond. ...
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5answers
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Is there a way to use free software to convert SMILES strings to structures?

So far I've been unsuccessful in finding an open source tool that will convert a large number (>100k) of SMILES strings to a chemical structure. Is this really only solved by commercial applications? ...
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1answer
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Understanding the unit cell of Chalcopyrite vs its formula

According to the Wikipedia article for Chalcopyrite it has a formula of: $\ce{CuFeS2}$ and a unit cell of: But from the unit cell it has 13 Copper, 10 Iron and 8 Sulphur. This doesn't match with the ...
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2answers
562 views

What is the structural formula of alkali hypohalite: MOX or MXO?

Recently I came across this question and in the comment section, there was an argument regarding the formula of sodium hypoiodite which kept me wandering: what is the actual formula of alkali ...
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1answer
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Doubts about IUPAC nomenclature of 4-ethyl-1-fluoro-2-nitrobenzene

Why is 4-ethyl-1-fluoro-2-nitrobenzene (structure is in the attached picture) called so ? Shouldn't it be called as 1-ethyl-4-fluoro-3-nitrobenzene since the precedence of ethyl is greater than ...
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2answers
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Why are triple covalent carbon to carbon bonds drawn linearly in skeletal structure? [duplicate]

In the link see that cyclic C-C structure with a triple covalent bond is drawn with an angle, probably the only way to draw it but why is it drawn linearly in non-cyclic and not like single or double ...
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Is the valency of carbon satisfied in graphite?

Graphite has hexagonal parallel planes. In a hexagonal structure the carbon atom has three bonds. Since the valancy of carbon is 4 is the valency satisfied in graphite?
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How to represent a 3D model of cocaine?

For my AP Chemistry class we were told to make a molecular diagram that was "better than excellent" and the rest is up to us (we could choose the molecule and how we wanted to represent it). My group ...
28
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2answers
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What are the meanings of dotted and wavy lines in structural formulas?

So I came across this diagram,the other day: As a chemistry student, I am well-versed with the dashed and wedged lines, but I was wondering what the wavy and the dotted line represent?
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1answer
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What is the formula of manganese oxohydroxide: MnOOH and MnO(OH)2?

I found various formulae of manganese oxohydroxide. Some site says it is $\ce{MnOOH}$, other say it is, $\ce{MnO(OH)2}$. So, which one is correct? The mineral manganite is considered manganese oxide-...
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Is there any way of representing a dative/coordinate covalent bond?

I was wondering if there was any way of representing a dative/coordinate covalent bond on a chemical diagram. A single bond can easily be represented as a single line, a double bond as a double line ...
12
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1answer
590 views

Why is the orbital angular momentum of a pi electron along the axis of two atoms' molecule one?

I'm reading quantum chemistry. The book says that the orbital angular momentum of a $\pi$ electron along the symmetry axis of a molecule made up of two atoms is $\pm 1$. I think this is a primary ...
3
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1answer
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What is the electron dot structure of an alkyne? [closed]

I am trying to determine the electron dot structure of an alkyne like $\ce{C2H2}$. I know that hydrocarbons with at least one carbon-carbon triple bond are called alkynes, and their general formula ...
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1answer
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Wondering about tetrasilicates [closed]

I found two papers from which two different formulae for the tetrasilicate (tetrasilicic acid) are found: 1.https://www.sciencedirect.com/science/article/pii/S0022309302015491. 2.https://www.ncbi.nlm....
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1answer
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Why is NO2 formed when N valency is 3

Sorry if the question is silly but this is troubling me more than enough. Here's what I know about chemical formula: Reverse the valencies of the combining elements. But in this case, $\ce{NO2}$ is ...
6
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1answer
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Structures for NO+ (Nitrosonium)

There are two possible structures for Nitrosonium : In the first structure, there is a +1 Formal charge on Oxygen, whereas, In the second structure, there is a +1 Formal charge on Nitrogen. Q. ...
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1answer
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Total Structural Isomers of diphenyl chloromethane?

The maximum option is 8 available but while Drawing I found there are many more . Are there any other condition of structural formula except the fact that the compounds will have the same molecular ...
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6answers
691 views

Organic Structure Challenge

Recently we had this challenge in our Organic Chemistry Department. I was not involved in it but I thought it might be interesting for the SE Chemistry site, so here it is. Propose a structure for ...
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1answer
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Chemical formula of Lactic acid

Formula of Lactic acid is given as C3H6O3, can't this be divided by the common factor3, and written as CH2O?
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1answer
345 views

What is the correct structure for trans-3,4-dichlorocyclopentene?

I have to draw the structure for trans-3,4-dichlorocyclopentene. What position should I draw the double bond at? Should I draw it as molecule 2? Because there's a trans. Or should I draw it as ...
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1answer
360 views

Why is a double bond not formed with oxygen when reacting this molecule with PCC?

In my textbook it says that when reacted with PCC, primary alcohols produce an aldehyde. Why is this example different? I do not see any double bonds.
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5answers
453 views

Free API to view 2D representation of Molecules

I'm looking for a free API that can accept a SMILE and produce the 2D structure of a molecule. I would like to include this in a web page. I have collection of SMILES and would like to have the 2D ...
5
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0answers
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Pseudo 3D skeletal structure style which emphasizes geometry

If one searches and navigates to a wiki page for, say, dichlorodifluoromethane one sees the 2D skeletal structure of the compound as below This representation appears to be of a particular style that ...
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1answer
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What sort of molecules or polymers are used in OLED displays?

OLED displays have been emerging as competitors for LCD displays for some time and are now common in mobile phones (see comparison of a Google Nexus 1 and an iPhone here) The displays use small ...
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3answers
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Is it possible to represent Aluminum 6061 (AlMgSiCuCr) as a skeletal structure? [closed]

Is it possible to represent Aluminum 6061 (AlMgSiCuCr) as a skeletal formula / structure? Linear Formula: Al-97.9% Mg-1% Si-0.6% Fe-0.4% Cu-0.28% (possibly helpful) Here's an example of what I mean.....
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1answer
287 views

What are the metamers of penta-1,2-diene?

First of all, are there any metamers for dienes? If there are any, how can I find them?
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1answer
67 views

2- or -2 as superscript? [duplicate]

When writing the formula for an ion, should the operator come before or after the number that indicates the ion's charge? Here are some examples: $\ce{SO_4^{-2}}$ or $\ce{SO_4^{2-}}$ $\ce{Fe^{+2}}$ ...
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2answers
90 views

How to find the compounds that form the solid (chemical formulas)

If we have a solution that contains water and potassium sulfate (K2SO4). And we add to this solution : Du magnesium chloride (MgCl2) and lead nitrate (II) (Pb(NO3)2) What would the compounds ...
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1answer
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does it make any difference writing NO2 instead of O2N [duplicate]

can you write NO2 in all three?
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1answer
17k views

Writing atoms of functional group backwards

Can the $\ce{HO}$ bond be written as $\ce{OH}$ and still be correct?
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2answers
656 views

Structural representation of substituted benzene

Recently, I was watching a video about separating o-chlorotoluene and p-chlorotoluene from its solution. Following was a reaction demonstrated in the video: I was curious about the structure of ...
22
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1answer
663 views

Interlocked cyclic compounds

Being new to chemistry, there may ought to be some properties I couldn't understand fully. One of them being cyclic compounds. One particular question about this is, whether these cyclic compounds, ...
8
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1answer
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What is the difference between an angular and linear skeletal formula?

When drawing a skeletal formula, what is the difference between an angular version and a linear version? I was asked to draw the Z isomer of Resveratrol: For which I drew: However the markscheme ...
3
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1answer
1k views

Why can't this be another structural isomer of ethanol?

Are the two structures depicting the same molecule? Why? Why not?
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1answer
459 views

Drawing and naming structures

I am trying to learn how to draw and name skeletal chemical structures and would like some opinions and help if you may. In the second (bottom) structure I can see that there are 6 carbons so hex ...
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1answer
84 views

Why doesn't the sulfate anion in copper(II) sulfate have a subscript of 2? [closed]

So I'm being asked to find the chemical formula for copper(II) sulfate. I thought it would be written as: $$\ce{Cu(SO4)2}$$ Apparently it's written as: $$\ce{Cu(SO4)}$$ Can anyone please explain ...
5
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1answer
466 views

How to find chemical similarity between two compounds using Tanimoto method

I came across a paper named "Chemical Similarity Searching" by Peter Willett John M. Barnard and Geoffrey M. Downs, 1998. At one place, this paper talks of finding chemical structure similarity ...
3
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1answer
61 views

Finding $c$ with Dulong-Petit law on non-molecular substance

The Wikipedia article states the Dulong-Petit law as follows: $$c=\frac{3R}M$$ $c$ is specific heat capacity $[\mathrm{\frac J{kg\; K}}]$ and $R$ the gas constant. $M$ is the molar mass in [g/mole], ...
10
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1answer
285 views

Standards for drawing chemical molecules

I'll preface this by saying I haven't had a chemistry class in 10 years and molecular structures are not my thing. But I'm submitting a revision to a journal paper where I need to include figures of ...
5
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1answer
377 views

How to infer formula from diagram

Hello Folks I am not now nor have I ever been any kind of chemist. My question is, how is the formula for Cerin, C30H50O2, consistent with this diagram taken from Chemspider? I can count the 30 ...
12
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3answers
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Structure of Ca2B6O11

What is its structure? I found an image of $\ce{B6O11}$ unit, but it looks incorrect: The top left corner one. The oxygen can make max 2 bonds but atom $\mathrm{O8}$ has three! There are ...
12
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1answer
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Derivation of formula for the degree of unsaturation

Degree of Unsaturation (DU) of an organic compound tells us about the total number of $\pi$ bonds (both double bonds and triple bonds) and number of rings/cyclic chains in the compound. Degree of ...
14
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3answers
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Portable library to render 2D structural formulas as vector graphics from SMILES or InChI

For a web-based project, I am looking for a piece of software to create a 2D vector graphics structural formula from a textual structure encoding scheme such as SMILES or InChI, running on the server ...
0
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1answer
61 views

Naming of an organic compound

How would I determine the systematic name of $\ce{(CH3)2CHCH2CHClCH3}$? First of all, how do we determine which side we number the carbon atoms from? It has an alkyl group ($\ce{CH3}$) and a ...
2
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1answer
250 views

How to find a chemical by its formula?

There are (obviously) a lot of chemical compounds. Wikipedia is able to translate names to molecular formulas for a lot of them. But is there a way to enter a molecular formula and find the chemical'...
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3answers
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Why are arenes with conjoined benzene rings drawn as they are?

Whilst we are taught to represent benzene as below (A) due to its delocalised electrons, however when two benzene rings share carbons (e.g. naphtalene) it seems to be more commonly represented in ...