Questions tagged [molecules]

An electrically neutral entity consisting of more than one atom (n > 1). Rigorously, a molecule, in which n > 1 must correspond to a depression on the potential energy surface that is deep enough to confine at least one vibrational state. This tag should be applied to question about certain molecules or a class of them.

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ChemDraw: how to save the only selected molecule as vector image

I'm a beginner at ChemDraw. I think it is a basic question, however, I couldn't find a solution on google.. I'd like to save the only selected part in a document as a vector image (svg, etc.), not the ...
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Is Molarity constant?

My friend and I were debating about if Molarity is constant in a disolution if this one changes volume due to evaporation. There was this problem that stated that 125 [mL] of sodyum chloride 0.122 [M] ...
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Why doesn’t AlCl3 form the dative bond within the same molecule? [duplicate]

AlCl3 is said to be an electron deficient molecule as Al only has 6 electrons in its valence shell. Why doesn’t it just form a dative bond with one of the chlorine’s? I know this gives the more ...
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Porous materials: Is the expression of a mean free path $\overline{\ell}$ of the gas molecule valid for a binary mixtures?

Suppose that I have a binary gas mixture at low pressure. Can I calculate the mean free path $\overline{\ell}$ of the gas molecule in a pores of solid material by substituting a molecular weight of a ...
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How do you name and number geminal molecules?

According to the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), superscript arabic numbers are used to differentiate the nitrogen ...
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Is it true that one atom does not form a molecule? [closed]

Here it states that one atom can form a molecule. Notice here that , one N and one O atoms are related
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2answers
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How is this possible in mole concept? [closed]

L = $6.022*10^{23}$ If I have one atom of oxygen , it has exactly L value. Now 2 atoms of a oxygen have 2L value.(Note that I mean 2O and not $O_2$here) Well , if we take a molecule made up of 2atoms ...
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Can molecule have just h-bonds between its parts

I'm just starting to study chemistry so sorry for the probably obvious question to you, guys. According to the definition of molecule in Wikipedia: A molecule is an electrically neutral group of two ...
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Is this diagram correct for difference between 2N and N2

There is 1 $\ce{N2}$ molecule formed with 2 atoms of nitrogen. 2N is 2 separate nitrogen atoms which have not formed any bond.Reasons could be that they didn’t get enough energy to form bond so they ...
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2answers
128 views

What is intermolecular distance in water? [closed]

I am wondering what is an average intermolecular distance in liquid water (say under normal pressure and room temperature). I need just order of magnitude. A reference would be helpful.
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Why does matter have spaces between them? [closed]

If you mix sugar Crystal in a glass of water and mix it well, the level of water will not rise.The reason they say is that matter have spaces between them.If matter have spaces between them , How ...
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“Isotopes” in a molecule?

I just learned that atoms of the same element can have different mass because of they are isotopes. If there are two isotopes in which each reacts to form the same thing. Would the mass differ in each ...
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Point group specific definition

Does the term only refer to molecules that have the same symmetry elements or exactly the same symmetry operations. Online I see that its the same symmetry operation however my professor's slides show ...
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how to obtain potential curves from database?

I'm sorry if this is a really super basic question. I am looking at the potential curves of a diatomic molecule in a book , and to plot them. I google the molecule and got to the NIST website, there I ...
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103 views

When is the activity coefficient greater than 1? [closed]

I am quoting a sentence from Non ideal solutions: if the interactions (between solute and solvent) repel each other, the activity coefficient is greater than 1. How can interactions between ...
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1answer
210 views

How many covalent bonds are there in carbon suboxide?

Calculate the number of covalent bonds in $\ce{C3O2}$. Structure: I am confused. I can count covalent bonds as 8 by counting single-single bonds, but also I can say that there are 4 "double ...
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What do (2S,3S) and similar notations mean?

When my textbook is discussing stereoisomers with more than one chiral centers, it's using notation like (2S,3S) being an enantiomer with (2R,3R) and so forth. I understand R and S configuration, and ...
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Calculating the number of volatile molecules in a container of known volume [closed]

Is it possible to calculate the number of volatile molecules (so only those in the gaseous phase) in a container of known volume, if the vapor pressure of the compound is known? So for example, if you ...
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Anthracycline nomenclature - doxorubicin [closed]

Why $\ce{-OCH3}$ is Number 3? I think that $\ce{-OCH3}$ Appropriates Number one.
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1answer
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Is a tautomer's stability compared with refernce to its initial compund [closed]

Considering the following example while comparing the enolic content in the product, am I supposed to compare its stability with reference to its initial state or am I supposed to compare it between ...
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366 views

How are organic compounds with radioactive atoms synthesized? [closed]

We often see reactions such as these in textbooks to highlight how reaction mechanisms work: How are the radioactive substrates required for these mechanisms synthesized in the first place? There ...
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How is nomenclature decided in this case (formyl vs oxy)?

I was asked the IUPAC Name of the following compound in JEE Mains (2nd September, Shift 1) 2020. There were two names occuring to me: 5-formyl-2-methyl-hex-2-enoic acid (2,5)-dimethyl-6-oxo-hex-2-...
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What is one formula unit? [duplicate]

I am really sorry if this is a beginner question but please still help me. In this website, which explains balancing chemical equations mentioned the word formula unit here: $\ce{3Ca(NO3)2}$ (just ...
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For IUPAC nomenclature, does the number of multiple bonds take precedence over the chain length?

I've received a few mixed answers to this question. Some sources say when determining the parent chain for unsaturated hydrocarbons, the longest chain should be considered before the chain with the ...
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Why is borole not considered aromatic

I came across a problem which stated that borole isn't aromatic. I thought that borole is similar to pyrrole so it should be aromatic, but that isn't the case. Can I know why isn't it aromatic? I was ...
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Laboratory and commercial preparations of aniline other than reduction of nitroarenes [closed]

Till now I could only find one laboratory preparation of aniline, i.e. reducing nitrobenzene with $\ce{Sn}$ and concentrated $\ce{HCl}$. I'm confused if Hofmann degradation is only commercial. I'd ...
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1answer
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More Anti-bonding or less bonding electrons?

Is a molecule more stable with less bonding electrons or more anti-bonding electrons? This question arose when I was asked the stability comparison between $\ce{N2^+}$ and $\ce{N2^-}$.
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Is it possible to achieve a level of “truly zero” concentration? [duplicate]

If we take some aqueous solution and dilute it further and further, will the concentration of the solution ever get to zero? I would say no, simply because total dilution implies that all the ...
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86 views

Rules to follow while writing a chemical formula for polyatomic ions

In Science, textbook for class IX, chapter $3$ [1,p.38], it states: The rules that you have to follow while writing a chemical formula are as follows: in compounds formed with polyatomic ions, the ...
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1answer
106 views

Naming a given organic compound according to IUPAC naming rules

Would the given organic compound be called "3,4-diethyl-3,7,7-trimethylnonane" with IUPAC naming rules? I don't really know if this should be called 3,4-diethyl-3,7,7-trimethylnonane, ...
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Process of a substitution reaction

In this question I am not able to decide by what process this reaction is happening. I first thought that one of the $\ce{H}$ from $\ce{CH3}$ will depart $\ce{Br}$ from $\ce{CBrCl3}$ but I am wrong. ...
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118 views

The Solubility of Tyrosine

I find very little data on the solubility of tyrosine, other than that it has a very low solubility at room temperature for an AA. (1) Does anyone know different ways to dissolve fair amounts of it in ...
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How is bond length of C-O and C-N same?

In NCERT and many other books it is given that bond length of $\ce{C-O}$ and $\ce{C-N}$ is same. But, how can it be possible as size of oxygen is smaller than that of nitrogen so bond length of $\ce{C-...
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Can pthalic acid or 1,2-Benzenedimethanol be possible products of Cannizzaro reaction of phthalaldehyde?

I know the main product that is ortho-hydroxymethyl benzoate ion but I think that phthalic acid and catechol must be formed also in very small amounts but I am unable to get any confirmation from the ...
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SMILES string convertors

I'm new to SMILES strings, and have noticed that they're not standardised. Firstly, what is the reason for different structures of SMILES strings to represent the same compound? Why not have a ...
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1answer
127 views

How to draw the 2D representation of ammonia molecule

In the 2D representation of the ammonia molecule, we see one solid line, one solid triangle and one dashed triangle A plane can be made to pass through any three given points. In other words, we can ...
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Stability of Peroxynitric Acid in cold temperature

I have a question about the stability of Peroxynitric Acid i.e. $\ce{HO2NO2}$ at cold temperature. I know that it becomes stable when temperature decreases, but what is the specific reason for it? I ...
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Origin in a crystal

I am trying to understand the International Tables for Crystallography. How can I identify the origin in the image on the left? Without knowing the origin, I cannot identify the position of the ...
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1answer
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Linear molecule that is liquid at room temp. and pressure?

I am trying to find a linear molecule that is a liquid at room temperature and pressure. Do you know of any? By linear I mean that all the bonds are co-linear (ie. simple alkane carbon chains don't ...
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Is there any elemental molecule which does not react well with anything but oxygen? [closed]

For example, phosphor reacts with oxygen but it also easily reacts with many halogens, metals, etc. Is there any elemental molecule that doesn't react well with almost anything but oxygen?
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Short description for destriptors output by PaDEL-Descriptor

I am trying to implement this paper & it uses PaDEL-Descriptor to get additional features. To be specific they extracted: Bond count: number of single, double, triple bond including and excluding ...
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1answer
137 views

Determine and draw planes and axes of symmetry of a molecule using software (VESTA or Mercury)

I designed the $\text{MoS}_2$ molecule (bilayer), with polytype 2H in the VESTA. My goal is to draw the plans and axes of symmetry of the bilayer set. According to the information in the literature, ...
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Breaking bonds with magnetic fields

I was wondering if we could break a bond by applying a big magnetic field on a molecule. The magnetic would just cause the spin of cores of the atoms making the molecule to be aligned , raising the ...
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What is the general or ideal equation for the radial wave function?

I came across this question on the internet: What is the value of $(n + l + r)$ in a given wave function, where $n =$ principle quantum number and $l =$ azimuthal quantum number and $r =$ total ...
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Finding Symmetry number of a molecule [closed]

An isotopic variant of the molecule SF$_6$ is S$^{19}$F$_4^{18}$F$_2$, with the two $^{18}$F nuclei oriented axially, so that the $^{18}$F-S-$^{18}$F angle is 180°and the four $^{19}$F nuclei form a ...
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Problem calculating relative molecular mass [closed]

I am starting be re-learn Chemistry after several years. The Book I am using has a test question to calculate the relative atomic mass of: $ (CH_3CO)_2O $ My take Carbon C, $ A_r = 56 $ Hydrogen ...
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What is the largest, noncrystalline, non-polymer inorganic molecule?

A question came up in class from one of my chemistry students. He asked what the largest, non-crystal, non carbon-based, molecule is. We ruled out complex proteins, DNA, and other polymers, as well as ...
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Do molecules with bridges through rings exist?

Do molecules with bridges through rings (in a manner illustrated by this) exist? I sometimes get results like this when doing Energy Minimization on molview.org. For example: Is this actually a ...
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What will be the number of molecules per mole in a set of different gases when compared with hydrogen? [closed]

The source of my question is due the nature of a problem which I found misleading in the way how it was presented. The problem is as follows: The molecular weight of hydrogen ($\ce{H2}$), helium ($...
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What is maximum energy level of molecules?

I have been reading about the relation of molecular graph spectrum, that is, the set of eigenvalues of the Laplacian matrix of the molecular graph, and molecular properties. Recently, I came across a ...

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