A molecule is an electrically neutral group of two or more atoms held together by covalent chemical bonds

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If you try to use the VSEPR model to predict the molecular geometry of XeF6, you run into a problem. What is it?

A. If you try to use the VSEPR model to predict the molecular geometry of XeF6, you run into a problem. What is it? B. What could you do to resolve the difficulty in part A? C. The molecule IF7 has a ...
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37 views

Zinc Picolinate - Positive, negative or neutral charge?

I'm going to be using a finings agent with a positive charge to remove negative trub from a solution (beer). I would like to keep some chelated zinc in the solution - ideally zinc picolinate - so ...
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21 views

How to estimate the dielectric constant of a liquid?

Are there any approximate relationships between the (static) dielectric constant of a liquid and properties of the individual molecules? For example, suppose I know the polarizability and dipole ...
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3answers
45 views

what is the simple enantiomer in the powder form that one can get?

I want to do some experiments on enantiomers. As it involves more calculations of potential energy surfaces, I would like to do this experiment on a simple enantiomer. For example CHBrClF. But this is ...
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61 views

Why don't molecules of ionic compounds exist?

My book says: "As single ions of a metal are not associated in the solid with single ions of a non metal, separate units of ionic compounds do not exist. It is, therefore, wrong to talk of a ...
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184 views

Does partial charge violate the law of quantization of charge?

Well, we know that charge is quantized. Quoting wikipedia below, Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge. And we know ...
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75 views

How to determine polarity in large molecules?

In case of small molecules like water things are more or less clear, but when I see a large complex molecule like Thyroid Hormone - how should I find out that this molecule is non-polar?
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47 views

How well known is the formula of carbonic acid?

My chemistry teacher in high school didn't know the formula for carbonic acid, which struck me as something someone with a degree in chemistry (as they allegedly do) should know instantly, or at least ...
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3answers
101 views

Number of molecules and atoms are same in a gas, how?

I had a test this morning in school and I am not sure of the answer,I think it is related to the quantity of a mole being constant: A sample of certain mass of gas was collected and it was found that ...
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3answers
59 views

how to determine which gas would have the lowest pressure

If the volume of each sample of gas was reduced to one-tenth of its original size and the temperature remained the same, which gas would have the lower pressure. I'm getting confused because my ...
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2answers
600 views

Oxygen in water: How is it single if it's always double?

This is simple question, I think. At college (I'm an Intro Chem. student), the professor explained that oxygen is always found in molecules of 2 oxygen atoms combined together - $\ce{O2}$. On the ...
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62 views

Are all organic molecules with odd-numbered electron count radicals?

This question was triggered by another question on this site, about molecules with a total number of 13 electrons. I couldn't think of any (except the boring answer of $\ce{Al}$), and the answers to ...
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Molecule with 13 total electrons

Is there a stable molecule with total number of electrons equal to 13? Molecule can be either organic or inorganic
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70 views

What is the reason a grain of salt alters the perceived bitterness of coffee by such a high degree?

Coffee served hot can be quite bitter (presumably high pH). Several people I have known will add a single grain of salt to the coffee - which reduces the perceived bitterness. My question is: What ...
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2answers
104 views

For a given teabag and dunking duration - will I get more caffeine in a bigger cup or the same amount?

When choosing a cup of tea, I can choose a big cup or a small cup. I'm wondering if I get more caffeine with the bigger cup or the same amount of caffeine. (in moles) My question is: For a given ...
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1answer
58 views

Reason for vibration of molecules

Why molecules of a body exhibit vibrational motion ? Is it due to interaction between various molecules of the body or inter atomic interaction of the same molecule? If it is because of any of them ...
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2answers
78 views

How does molecular structure affect physical properties?

The question sounds vague and non-specific because my background in chemistry is limited to undergrad college courses. However, I am interested in learning the correlations between the atom-by-atom ...
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2answers
93 views

Is a diamond a single molecule?

Assuming a perfect diamond with no impurities. Would this diamond considered to be a single large molecule? Browsing the interweb I found several opinions about this but did not find a clear Yes or ...
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151 views

Why does ammonia have sp hybridization?

Apparently it has sp3 hybridization, but I don't understand why. Ammonia (NH3) seems to me to not require sp hybridization because all of its bond lengths are already equal. It has 3 hydrogens bonded ...
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56 views

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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45 views

Non polar molecular and attractive forces

How come when a non polar molecule increases in size, the attractive forces between the molecules of a substance also increase? I thought that when a molecule increases in size, the atomic radius ...
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1answer
103 views

How can it be certain that some bonds are 180 degrees?

Take acetylene, for example. It is defined that the two outer bonds are at 180 degrees. How is it possible to theoretically define all C-H bonds in acetylene as being 180 degrees?
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49 views

Atomic properties

This may be a very broad question. I always asked myself how scientists manage to find out the exact molecular structures of for instance water or carbohydrates. How do they know? How do they know the ...
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57 views

Phosphorus Oxide (V) - a proper formula - is it $\ce{P4}$$\ce{O10}$ or $\ce{P2}$$\ce{O5}$?

I would like to ask about formula of phosphorus oxide (V). Should it be $\ce{P4}$$\ce{O10}$ or $\ce{P2}$$\ce{O5}$? which is right when I have to write molecular formula
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727 views

The Lewis structure of HNO3

So I was checking the structure of nitric acid in Wikipedia, however I couldn't quite fathom why it looked like that because it seemed to contradict the following statement: A Lewis structure with ...
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60 views

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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404 views

Why do people still use the mole (unit) in chemistry?

I know that the mole is widely used in chemistry instead of units of mass or volume as a convenient way to express amounts of reactants or of products of chemical reactions. I'm wondering why people ...
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143 views

Simple question about concentration of a solution

Suppose that the molar concentration of $\ce{K2SO4(aq)}$ is $C=1\ \frac{\text{mol}}{\text{L}}$. We have $C_{\ce{SO4^{2-}}}=C=1\ \frac{\text{mol}}{\text{L}}$. However, does $C_{\ce{K+}}=C=1 \ ...
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210 views

Torsion angle symbol

I'm reading up on molecular modelling and have come across some terms I should probably have learnt a long time ago but always scared me off a bit with the Greek letters. I guess I'm a big boy now so ...
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1answer
42 views

Why polymorphs form?

We always hear about the different arrangements of molecules that lead to the formation of polymorphs, my question here is why would a polymorph form in the first place? The material was given enough ...
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1answer
126 views

How to change CO2 to a less polluting gas?

I want to change $\ce{CO2}$ coming out of the tailpipe of a car to some other compound that is considerably less harmful to the environment with a filter of some sort. What are some ways that this is ...
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175 views

References to draw 3D molecules with directionality of non-bonding electron pairs and p-orbitals

My instructor has been drawing 3D molecules that show the directionality of non-bonding electron pairs and p-orbitals. I've been trying to find references online that show this process, but I'm having ...
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1answer
90 views

How did the first amino acids appear on earth?

Is there a prove or a theory that the first amino acid synthesis was influenced by a change in heat, gravitation, radiation or something like that?
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197 views

Use of osmosis to measure molecular weight of macromolecules

How can osmosis be used to measure molecular weight of macromolecules ? Is it applied practically ?
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560 views

Is neon a molecular element?

Does the chemical element neon consist of a molecule? For example, oxygen consist of two atoms together. But is that the same with neon?
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88 views

I need to make a solution with a specific concentration. How do i find the mass?

I have to make a 250 mL solution of $\ce{Mg(NO3)2}$, the concentration of the solution has to be 0.3 mol/L. How can I find out the mass of how much $\ce{Mg(NO3)2}$ I need to use?
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54 views

Structure of N₅P₃?

What is the structure of the molecule N₅P₃? N₅P₃ is not documented online so could anyone please say the structure of the molecule: How many ligands does each Phosphorous atom have? How many ...
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135 views

(Organic Chemistry) Common Atoms in Organic Molecules [closed]

What are 6 atoms commonly found in organic molecules?
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How are pure substances (elements, compounds, etc) produced?

How are large quantities of the substances we use in the lab generally produced? (As in the process from getting the stuff out of the ground to use in the lab) How 'pure' are they? Also: is it ...
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164 views

Why can't you see air but can feel it [closed]

Is there a device that can measure the air in the room in lbs? I would appreciate the anseer
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3answers
1k views

Why won't water freeze if you put ice in it, despite ice being frozen?

Just now I got some room temperature water and added some ice to cool it, and it just came to me, like the scientist I wish I was ... why doesn't frozen (freezing point) ice added to higher ...
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2answers
294 views

Why do molecules having a higher $M_r$ have stronger inter-molecular forces?

Why do molecules like alkanes with higher molecular mass ($M_r$) have stronger inter-molecular forces? For example, methane ($\ce{CH4}$) has a weaker intermolecular force than pentane ($\ce{C5H12}$). ...
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122 views

Egg-Detection in Pastries: An Analysis in Heat-Alterated Molecule Identification

I would like to know if anybody here knows of a method to detect the presence of ovalbumin--or any unique, egg-related molecule, in a baked good. Here I am anticipating that the "unique egg-related ...
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146 views

Methylcyclohexane chair conformers

I am trying to create the molecule of the methylcyclohexane in the equatorial and axial conformers. I read in this site about the chair conformation. My molecule looks like the following picture ...
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1answer
92 views

Percentage of a conformer in vacuum

I just started with Molecular dynamics simulations. My background is computer science but I'm learning about scientific computing and thus my jump into MD. Having said that, I was asked to calculate ...
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48 views

Quantity of Carbon and Hydrogen according to the molecular formula

$1.367$ of an organic compound containing carbon, hydrogen and oxygen was combusted in a stream of air to yield $3.002$g of $CO_2$ and $1.640$g of $H_2O$. The molecular mass of the compound was ...
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3answers
170 views

When did the atom Theory Become indisputable?

We know that the Greeks were the first scientists (or better, philosophers) to introduce the idea that matter is made up of little “chunks”, and they named these chunks “atoms”. This idea that matter ...
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1answer
81 views

Do halogens bond more commonly with each other or themselves?

To me it seems like diatomic elements like $\ce{F2}$, $\ce{Cl2}$, etc. occur more prevalently than diatomic molecules with both, like $\ce{ClF}$. Is this the case, and if so, what causes diatomic ...
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96 views

Prediction of surface atoms in molecule from its graph

If we are given a molecular graph i.e. al the atoms involved and their connectivity, how can we make reasonable prediction if the atom would lie in the surface or in the inner part. On way might be ...
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678 views

Electron density definition of single, double, triple bonds?

I was reading this question and the answer by @EricBrown to it and this got me thinking about covalent chemical bonds. The way I was always taught is that a single bond contains 2 paired electrons, ...