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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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 the formula of coca cola can not be find using chemistry? [duplicate]

i mean we have SPECTROSCOPY to stablish what molecules make a compound and also we have advanced chemistry so why is SO HARD to find the formula of coca cola ? simply buy a bottle examine it to ...
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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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Why are X-rays used in crystallography?

Can any other wavelength of electromagnetic radiation be used? Why can't gamma radiation be used?
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Compound with two functional group

Compound X has 3 carbon atoms in one molecule. It contains a primary alcohol and a carboxylic acid functional group. Draw the displayed formula of Compound X. Help! Condensed formula is fine for me!...
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3answers
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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 ...
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1answer
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Number of resonating structures (hypothetical)

To my knowledge, resonance happens where more than one lewis stucture can represent the compound with no shift in sigma bonds so, suppose in a simple conjugated system even like 1-3 pentadiene , two ...
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0answers
265 views

The proper formula of sucrose - why both forms are correct and how one is transformed into another [duplicate]

During preparations for my exam I've stumbled upon a tormenting question how it happens that the formula of sucrose is written in two different forms - the vertical and the horizontal. the horizontal ...
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1answer
6k 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-...
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Is this the correct formula for dopamine? [closed]

Google says that $C8H11NO2$ is the correct formula for dopamine. Is this so?
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What is the structure of iodide of Millon's base?

In qualitative analysis, $\ce{NH4+}$ ions are confirmed using Nessler's reagent:- $$\ce{NH4+ + 2[HgI4]^{2−} + 4OH− → HgO·Hg(NH2)I ↓ + 7I^{−} + 3H2O}$$ The brown precipitate ...
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2answers
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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?
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Chair conformation. Wedged lines vs no wedged lines?

As the title suggests, I have been wondering why some chair conformations utilize wedged lines for some of the bonds while others have regular thin lines for all bonds, you can take cyclohexane as an ...
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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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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 ...
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Why do some diagrams of some molecules show the bonds of only some of their submolecules?

In the diagram of ATP below this paragraph there are no lines between the atoms in the $\ce{NH2}$ molecule or in the $\ce{OH}$ molecules; however, there are lines between all the other atoms. Does the ...
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1answer
101 views

What does this curve over the C-B bond mean?

I have come across this notation in a question I am trying to answer and am unsure of what exactly it means, can anyone clarify what this represents?
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Is this a possible structural isomer for Butene(C4H8)

Today in school, my teacher was explaining the different types of alkenes. Examples included ethene, propene, and butene. She also showed us their structural formulas. I tried to draw butene's ...
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488 views

Getting structural formula of complex molecules? [closed]

How is it possible to precisely map huge molecules? Somehow, scientists easily know the structure of a compound of any complexity. What techniques are used to know the sturcture of molecules like ...
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1answer
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Is it incorrect to use Fisher Projections for carbons that don't have stereocenters?

For example: Is a cross specifically used for stereocenter representation?
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1answer
506 views

Structure diagrams indicate plausible structures? [closed]

Structure diagrams have a hexagonal, "chicken wire" shape, which leads to more elegant representations of some molecules than others. For example, the following diagram must deviate from the usual ...
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206 views

Does PO3- exist as a free ion or in a cyclic/linear polymeric form? [closed]

My book says that $\ce{PO3-}$ exists as cyclic or linear polymeric structure but doesn't elaborate on this. I Googled this and found no result either. Also, what would be the structure of $\ce{PO3-}$...
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205 views

What is the correct way to draw the end groups of polylactic acid?

I came across two different ways to draw the end groups of polylactic acid: (source) AND: (source) Which one is the correct way?
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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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Sodium phenoxide bonding

Benzene has O and Na attached. Oxygen with a negative charge and sodium with positive , so they write it as $\ce{benzene-O- Na+}$ Why couldn't it simply be like oxygen bonded to benzene and ...
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Existence of Deuterium peroxide

Does deuterium peroxide exist? Wikipedia has no reference. Also, the sites for delivery of chemicals like "Pubchem" or "Chemspider" have no reference. In my book, a preparation of $\ce{D2O2}$ is ...
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What are the structures of potassium superoxide and xenon hexafluoride? [closed]

I have 2 questions in mind: 1) What is the structure of the superoxides? More specifically, what is the structure of $\ce{KO_2}$? 2) What is the structure of and dipole moment for $\ce{XeF_6}$?
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How were old style stereographic structures produced?

Old papers on chemical structures often contained "3D" renderings of the molecule by using 2 2D images and requiring the reader to go cross-eyed to get the 3D image. A good example I recently found ...
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Can the structure of an azide ion contain a coordinate bond?

Can the structure of an azide ion ($\ce{N3-}$) be $\ce{N#N\bond{->}N^-}$? I know the actual structure but was asking whether the single bond can be shifted to a N to make it a triple bond and a ...
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3answers
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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 ...
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1answer
664 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, ...
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2answers
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Why does this compound only have one pair of enantiomers?

I've been doing some reading about enantiomers, which are apparently chiral molecules that are non-superimposable mirror images of each other. An example I found of this in some problems that I've ...
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1answer
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What would a diagram of the metal lattice structure of CuSO4 look like?

Just as $\ce{NaCl}$ would look like this: What would a diagram of $\ce{CuSO4}$ look like?
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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 ...
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2answers
68 views

cupola based hydrocarbons

My favorite groups of shapes are cupolas. Are there hydrocarbons in the shape of these similar to how cubane is to a cube? If so how stable are they, and could you please give some general information ...
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1answer
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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? ...
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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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What is the meaning of parentheses in a condensed molecular formula?

In the formula $\ce{(CH3)3-C-CH(CH3)-CH2-CH3}$, what do the parenthesized portions represent? What is the molecular structure, and how do I name the compound?
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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 ...
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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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1answer
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Writing atoms of functional group backwards

Can the $\ce{HO}$ bond be written as $\ce{OH}$ and still be correct?
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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 ...
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2answers
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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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2answers
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Hydrocarbons with only 4 carbon atoms

How many different organic structures (from the pure theoretical viewpoint) can be drawed with only 4 (exact) carbon atoms and with/without hydrogen? Polycyclic compounds and bridged compounds are ...
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1answer
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How to draw glucose using a Fischer projection?

I asked how to draw glucose as a Fischer projection from its given chair conformation but all I got was an unsatisfactory ad hoc explanation involving rotation of my neck muscles to somehow see where ...
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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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1answer
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Inversion of Configuration - Opening of Epoxide

This doesn't look like a traditional inversion of configuration: At first I dismissed the textbook author as making a typo. But then I realized that this "typo" was repeated throughout the solutions ...
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565 views

Shape Of Cetyl Alcohol

Why is cetyl alcohol bent at the 9th position?
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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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Meaning of 1,1,1,2 in 1,1,1,2-Tetrafluoroethane & similar

What is the meaning of the 1,1,1,2 part in the compound 1,1,1,2-Tetrafluoroethane, a refrigerant commonly known as R-134a, some info: Formula: $\ce{CH_2FCF_3}$ Structure: Reference: http://en....