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.

Filter by
Sorted by
Tagged with
10
votes
2answers
678 views

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

There seems to be an inconsistency in the formula. Somewhere it is written as MOX and in some places, it is written as MXO. This is what Google gives when you search sodium hypochlorite: I think the ...
-1
votes
0answers
10 views

Structural formula conventions used in drug companies [duplicate]

Can someone tell me what that cross like double line represents in this structural formula? And what is that tripplet of lines all about, between O and HC?
21
votes
4answers
11k views

Can ozone have a triangular structure?

The structure of ozone is traditionally depicted using two resonance forms: However, what I am wondering is instead of using such an idea to explain the structure why can't we show the structure of ...
17
votes
5answers
31k views

What is the chemical structure / hybridization of sulfuric acid?

I was looking at the chemical structure of $\ce{H2SO4}$. Intuitively, I would have expected this molecule to be square planar in accordance with $p^2d^2$ or $sp^2d$ hybridization, but instead it is ...
6
votes
6answers
733 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 ...
1
vote
0answers
19 views

How does the mass composition affect the empirical formula? [closed]

I have to do an assignment of empirical formula, and how different percentage mass compositions affect the formula obtained, from experimental data. We did three trials and 2 of which of the same ...
0
votes
1answer
46 views

What is the name and formula of this structure? [closed]

Could anyone please let me know the formula and name of this structure? Any answer is helpful. Could you also summarize how to deduce the formula? Here is an image:
0
votes
0answers
21 views

What is the Structural Activity Relationship of Cocaine?

Cocaine, also known as coke is a widely known drug for both recreational and pharmacological use. What is exactly the relationship of it's structure to it's drug activity?
22
votes
2answers
5k views

PBP vs TBP geometry?

Why are the axial bond lengths greater than those of the equatorial bonds in a trigonal bi-pyramid (TBP) geometry molecule; but the opposite is true for pentagonal bi-pyramid (PBP) geometry molecules? ...
5
votes
1answer
99 views

How to search substructures with explicit hydrogen in RDKit?

For a substructure search I would like to search for structures containing unfused benzyl. The idea was to explicitly add hydrogen. But apparently this does not give the expected results. So, I ...
-1
votes
1answer
46 views

Is it correct to put a methyl group on each end of a skeletal formula? [closed]

On my organic chemistry exam there was a skeletal formula that had, supposedly one methyl group at each end of the skeletal formula and one somewhere in the middle. But is it correct if you draw a ...
-3
votes
1answer
5k views

What is the difference between metaphosphoric acid and phosphonic acid?

Are metaphosphoric acid and phosphonic acid the same? I have been told that they're same BUT the structures online are different. Metaphosphoric acid has formula: $\ce{(HPO3)_n}$ phosphonic acid ...
5
votes
2answers
2k views

Why is H bonded to C5 drawn below the plane in Haworth formula for D-glucose?

I have always seen the hydrogen atom bonded to C5 drawn below the plane as in the following figure. Shouldn't it be drawn above the plane since it is drawn on left side in Fischer projection?
7
votes
1answer
204 views

Meaning of the term “vertex” in the topic of skeletal formulae

From the Wikipedia article on skeletal formula: Hydrogen atoms attached to carbon are implied. An unlabeled vertex is understood to represent a carbon attached to the number of hydrogens required ...
12
votes
5answers
11k views

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? ...
4
votes
4answers
3k views

Is peroxoborate and perborate the same thing?

Recently I came across the following question:- Preparation of Sodium Peroxoborate- Equations The term peroxoborate came from the fact that it has the peroxo bond $\ce{-O-O}-$. So, it should be ...
6
votes
1answer
532 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 ...
2
votes
1answer
710 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, ...
6
votes
2answers
3k views

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 ...
3
votes
1answer
1k views

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. ...
0
votes
1answer
56 views

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 ...
8
votes
1answer
5k views

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 ...
0
votes
2answers
204 views

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 ...
9
votes
2answers
18k views

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?
1
vote
2answers
1k views

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
votes
2answers
49k views

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?
1
vote
1answer
8k views

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-...
6
votes
3answers
3k views

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
votes
1answer
657 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
votes
1answer
3k views

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 ...
-2
votes
1answer
44 views

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....
3
votes
1answer
9k views

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
votes
1answer
19k views

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. ...
-2
votes
1answer
478 views

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 ...
18
votes
6answers
721 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 ...
-1
votes
1answer
2k views

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?
1
vote
1answer
541 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 ...
-6
votes
1answer
387 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.
5
votes
0answers
230 views

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 ...
7
votes
1answer
1k views

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 ...
-2
votes
3answers
125 views

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.....
0
votes
1answer
412 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?
4
votes
1answer
76 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 $\ce{SO_4^{2-}}$ $\ce{Fe^{+2}}$ ...
-1
votes
2answers
99 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 ...
1
vote
1answer
3k views

does it make any difference writing NO2 instead of O2N [duplicate]

can you write NO2 in all three?
2
votes
1answer
17k views

Writing atoms of functional group backwards

Can the $\ce{HO}$ bond be written as $\ce{OH}$ and still be correct?
16
votes
2answers
767 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 ...
24
votes
1answer
964 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
votes
1answer
1k views

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
votes
1answer
1k views

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

Are the two structures depicting the same molecule? Why? Why not?