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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2answers
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How can we rationalise the amount of crystal water in coordination complexes?

I was wondering why specific number of water molecules are attached to salts like $\ce{CuSO4.5H2O}$? Searching gave me a satisfying picture : I think $\ce{FeSO4.7H2O}$ should have a similar ...
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1answer
429 views

How could scientists produce accurate chemical structures before they could capture images of molecules?

How were scientists able to produce these accurate structural diagrams long before scientists were able to capture images of the actual molecules? Reference: Scientists capture first images of ...
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1answer
552 views

Incorrect Ring Flip?

Is the flip of the cis-isomer wrong? Specifically the image on the bottom right. What I see is that on the cis-isomer in the first chair, we have an axial upward methyl group and an equatorial ...
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1answer
249 views

Equivalent Line Angle Structures?

Are the following equivalent structures for 2,2-dimethylpropane? I think so, because my rendering simply rotates the cross 45 degrees! Also, regarding 3,3-diethylpentane, are these both equally ...
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3answers
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Oxalic acid structure

What is the reason why oxalic acid has its second $\ce{-COOH}$ group flipped? I'm guessing it's something to do with steric repulsions between the $\ce{-COOH}$ groups but I'm not sure.
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2answers
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Determine which molecule has stronger intermolecular force?

SiH4 and CH4 The only intermolecular force they both have is London Dispersion forces Strength of LDF is determined by molar mass molar mass of SiH4 = 32.132 molar mass of CH4 = 48.42 Therefore ...
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 ...
2
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1answer
98 views

How does the activity of Sn chemical potential vary as a function of composition at 900 C?

This is referring to the Cu-Sn phase diagram in which composition varies along a horizontal line at a certain temperature. I understand that as you move along that line different intermetallic or ...
2
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1answer
3k views

Why aren't there 8 double bonds in octasulfur (S8)?

I know that the $\ce{S8}$ molecule contains 16 pairs of lone electrons. My teacher always says that we must try to reduce the no of lone pairs, so, had there been double bonds between 8 atoms of ...
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1answer
2k views

Gold's atomic structure and bonding in relation to the separation techniques used

How is Gold's atomic structure and bonding related to the separation techniques used to distinguish it from other substances? I'm just confused on what I'm actually searching for, I have read so ...
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1answer
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Why is this organic compound trans, and not cis? [duplicate]

I'm reading a high school chemistry course online, and I'm now reading about geometric isomers. They provide this example: And in terms of naming it, they say this: Begin by identifying the ...
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1answer
927 views

Does it matter which end of a chain one sets to be 1 when drawing the structure of organic compounds?

For example, if I were to draw the structure of 1,2,4-trimethylcyclohexane, then would one or both of these be wrong? Or are both right? I'm wondering if it matters where I start to count from 1 in ...
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1answer
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Why doesn't EDTA have a double bond?

EDTA (Ethylenediaminetetraacetic acid) has a structure like this But why, as the name 'Ethylene' suggests, doesn't it should have a double bond between carbons?
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1answer
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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 ...
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0answers
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Can anyone identify this uncaptioned diagram?

It's from the start of part 3 / chapter 19 in Lewin's Genes X (see this page in Google Books)... Looks a bit like a Ramachandran plot(?) but the axes only go to 100 / 70ish, but I don't even know ...
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1answer
791 views

Tools to draw molecular structure (wireframe) along with atom numbering

I am looking for open-source tools which can generate 2d molecular structure from the MOL or SMILES file. Further, it SHOULD number the atoms in the order of occurrence of atoms in the connection ...
7
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1answer
252 views

Solvation of uranyl formate/acetate

Uranyl formate has a structure something like: $\ce{UO2-(OCHO)2}$ So the structural formulae I've seen have two double-bonded oxygens directly attached to the U and each formate group is attached by ...
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3answers
608 views

When should we not draw a Lewis dot structure?

My friend once told me that technically , we should not draw Lewis dot structure of molecules containing no central atom.(eg.benzene,acetic acid) Is he right ? If yes, then what is the reason behind ...
5
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1answer
37k views

Lines on inside of hexagonal shapes of structure diagrams

just a simple question from me today... I was looking at the structure of Norepinephrine for a school project and was curious about the diagrams on the Wikipedia page for it. I was wondering why ...
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2answers
898 views

How to draw Lewis dot structures?

What is the most logical and easy to remember step by step method for drawing Lewis dot structures? I'm having trouble drawing a simple one for $\ce{CO2}$.
9
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1answer
581 views

Chemical diagram for cummingtonite?

Any suggestions on diagramming the chemical structure for cummingtonite? $$\ce{(Mg,Fe)_7 Si_8 O_{22} (OH)_2}$$ As I understand it, the $\ce{(Mg,Fe)_7}$ says the molecule has seven atoms that could be ...
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 ...
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1answer
1k views

Bent molecular geometry of water

Could you please explain how the bent molecular geometry of water is due to hydrogen bonding? I was under the impression that it was because of the lone pairs (VSEPR Theory).
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1answer
787 views

What is the specific structure of Poly(allylamine hydrochloride) (C3H7N)n HCl?

I'm working with Poly(allylamine hydrochloride), and I found that the chemical formula is $$\ce{(C_3 H_7 N)_{$n$}. HCl}$$ But I need a diagram like below, but more explicit. I mean with the carbons, ...
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5answers
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Are there notable organic compunds which look very similar but have very different properties?

I've seen people arguing for some questionable "miracle cure-all" alternative medicines not scientifically, but by their own logic. A common claim is, that if a compound looks very similar to an ...
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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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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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5answers
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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 ...
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1answer
5k views

Interpreting a formula tattoo

I saw on the Internet and I'm curious as to what compound is represented by it.
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4answers
3k views

Is the order of orientation of electron box diagrams meaningful or arbitrary?

Here is my interpretation when asked to: By drawing arrows in the appropriate boxes, complete the outer electron structures for Cu and Cu2+ I had no problem in drawing out the electron structure, ...
8
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1answer
995 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 ...
9
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1answer
254 views

Why is it that the bigger the side-chain is, its hydrogen atoms tend to be more equatorial?

The most stable cyclohexane form is the chair conformation but on the other hand, the bigger the side-chain of the cyclohexane is, its hydrogen atoms become more equatorial rather than axial, which ...
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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 ...