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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56 views

What is the difference between these two structural formulas?

In response to this chemistry question: Draw the full structural formula of [1 molecule of] ethene showing all atoms and bonds. I drew this: But the answers said this: What is the difference ...
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1answer
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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 ...
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1answer
367 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
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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
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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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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
333 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 ...
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1answer
1k 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?
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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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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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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
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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
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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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5answers
511 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 ...
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6answers
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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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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
87 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 ...
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1answer
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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], ...
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1answer
386 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 ...
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1answer
65 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 ...
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1answer
427 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
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Double bond crossed lines representation

I have been studying organic chemistry for years, and I do not remember the spotting double bond represented with crossed lines, except maybe one ore two more times in addition to the following one ...
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1answer
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What does penicillin react with? [closed]

Just wondering what penicillin reacts with and if so, can you please write a word equation. I've tried to do some research on it but had no luck. would mean a lot if someone could help me out
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1answer
263 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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Online, free SMILES interpreter [duplicate]

A while back, I used chemspider.com at some point to get structures from a SMILES string. I found that it wouldn't get some strings, so I switched to chemicalize.org. The site appears to have been ...
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Is rotation/flip of skeletal structural formula of Sildenafil/Claim 6 okay?

I want to show visually the similarities between Sildenafil (Viagra) and the molecule on the right: Is it allowed to flip the skeletal structural formula and rotate bond strings of the molecule on ...
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1answer
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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 ...
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1answer
54 views

Is there a way to find the mixture type with just the molecular formulas and masses of the solute and solvent?

If you had the molecular formula and molar mass of a solvent and a solute and no other specific information about the two, could one deduce the type of mixture (suspension, colloid, solution) they ...
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1answer
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Why is the chemical formula for ethanoic acid CH3COOH and not C2H4O2? [duplicate]

Why does the hydrogen ion move to the front of the formula and not to the subscript of the H already in the formula?
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1answer
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How to draw Fischer projections for carbon chain having more than two carbons?

How can we draw Fischer projections for one-five carbon compounds? For example, say we have pentane-2,3,4-triol ($\ce{CH3-CHOH-CHOH-CHOH-CH3}$; image below). With wedge and dash structure, the ...
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3answers
612 views

Skeletal formula of methyl chloride

Recently in The Periodic Table, there was a short discussion regarding this structure: At first sight, I couldn't figure out what is the structure. After a quick google search, I came to know it is ...
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1answer
257 views

Are the total number of electrons present in the central atom of triiodide equal to 10?

My book states that the total number of electrons present in the central atom of $\ce{I_3^-}$ is equal to 10. What if I put a negative charge on the central iodine atom such that it gains a ...
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4answers
262 views

Is there a particular reason for the way these structures are represented?

I know the question might seem a bit elementary but i was was curious whether there is a particular reason behind the way hydrogens are represented in a hydrocarbon chain. Is there a difference ...
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2answers
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Understanding the bond-line representation of glycine

I'm confused because I see now two different way to represent the glycine amino acid. while I understand the first way of the representation the second one I don't understand at all. I believe that ...
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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 ...
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Skeletal formula for carbon with two double bonds

How do I depict an sp-hybridised carbon with two double bonds? $$\ce{R=C=R}$$ If I just leave it out, like I would for a normal $\mathrm{sp^3}$ or $\mathrm{sp}$ carbon, it's difficult to see that it'...
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2answers
470 views

Identify two amines

I was reading a random text about the surface chemistry of YBaCuO superconductors. In the text, there was a table. The table had a list of several chemical compounds, including these two: Alkyl Amine:...
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What is the correct way to illustrate a bond to something irrelevant in a structural formula?

You can probably tell I'm not really a chemist (hi from physics!), but I've suddenly found myself having to draw some structural formulae, hence the stupid question. I've drawn a diagram of the four ...
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1answer
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What does the symbol ϕ mean in skeletal formulae?

I was given this formula by my A-level teacher and was curious as to what it means. It seems to be the Greek letter phi. I have searched online and have not been successful. Any help would be greatly ...
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1answer
885 views

Propan-1-ol Heats Objects Faster than Propan-2-ol. Is this an anomaly?

After conducting a practical revolving around burning alcohols, I found that propan-1-ol heated the 50 mL of water to 60 °C about 1 min faster than propan-2-ol. The experiment was controlled as much ...
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1answer
442 views

Can not find structural formula with compounds' IUPAC name

I currently need to read a paper. In that paper the following compound was mentioned: 1,2-benzo-6-(N-ethyl-N-isobutylamino)fluoran I tried to find the corresponding structural formula using the ...
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2answers
676 views

What compound does this chemical formula represent?

I recently saw this: What chemical does this formula represent?
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2answers
706 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 ...
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1answer
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How do I arrive at correct furanose structures when starting from a Fischer projection?

While numbering the furanose ring from the left are we supposed to place the atoms on right of the Fischer projection to the top? Isn't it just the opposite to what we do while numbering from the ...
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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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Nucleophile in a reaction [closed]

How can we determine which atom is a nucleophile in a compound in a reaction? I know we see resonance, but I am little confused between electronegativity, formal charge, solvent, and size.
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491 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 ...
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1answer
366 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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Zigzag line in the structural formula of budesonide [duplicate]

Excuse me if this question is already answered, but while reading about budesonide, if came across a strange notation I have never seen. I am talking about zigzag line on the right sine. Can somebody, ...