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

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What actually is the Wavefunction?

I am aware that the square of the Wavefunction gives the probability density of finding an electron at a particular point in space. I have also heard that it's a complex number but since it's a ...
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21 views

Find the partial pressure in a container

I have an air mass which consists of 78.1% $N_2$, 20.9% $O_2$, 0.964% $Ar$, and 0.0378% $CO_2$ in a container which volume $V=40~L$ at a temperature $T = 298.15~K$. The total pressure is ...
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35 views

Electrolysis of Beer

Electrolysis of water, means that the water is separated into hydrogen and oxygen. As beer also includes water, I initially thought electrolysis of beer would cause the water to separate, and the ...
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44 views

Can you calculate the properties of a substance based soley on its atomic properties?

I'm trying to write some software that I can use to determine, roughly, what the physical properties of a pure substance are. I know I could just use a database of the known properties of each ...
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1answer
23 views

Chemical nomenclature of ions

I'm a very beginner in chemistry. The book I'm studying says that an ion is an atom, or a collection of atoms, that has an electric charge, then it writes about the difference between molecules and ...
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39 views

Why does water break salt really

A kid asked me this question just the other day, and I said that the positive part of $\ce{H2O}$ attracts the negative $\ce{Cl}$ ion and the negative part of the $\ce{H2O}$ attracts the positive Na ...
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1answer
42 views

About the way chemicals and molecules are represented

The standard way of representing molecules with letters like $\ce{C}$ for Carbon, $\ce{O}$ for Oxygen etc.; and a lot of lines and double lines like a graph from Graph theory where each letter is a ...
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1answer
70 views

Phenyl vs phenol functional group?

Phenyl is a functional group with an aromatic ring bonded to another group. And, phenol is a molecule that is just a phenyl bonded to a hydroxyl group. However, some sources consider phenol itself a ...
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47 views

Nitrogen dioxide dimerization

$\ce{NO}$ can't dimerize and that is explained because the free electron is in an antibonding orbital. The same is true for $\ce{NO2}$, but it can dimerize, how?
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91 views

Why are least electronegative elements usually in center of lewis structure

Many sources state that one of the primary rules for molecular structures is that the least electronegative element is in the center. However, none of them explain why this is the case. Is this ...
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51 views

Why is it O-Cl-O and not O-O-Cl?

I'm currently preparing my exam and while I did never think about this question during the course, it begins to confuse me right now... Why is it the structure of $\ce {ClO_{2}-}$ like $\ce {O-Cl-O}$ ...
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26 views

H2, dipole transitons [closed]

I'm a not a chemistry expert, so please forgive me if what I write is not entirely correct. I come from an astrophysics background and in several astrochemistry papers it is mentioned that dipole ...
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41 views

Molecules that get charged in Water

I am a chemistry super noob and I was watching a MIT video where the professor states that: "Certain molecules become charged when they come in contact with water in the natural state" Can someone ...
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1answer
50 views

Difference between torsion, out of plane, coplanar and perpendicular bends?

In Infrared spectroscopy, stretches are easily understandable. But, how do I visualize (or conceptually understand) the difference between dihedral (torsions), out of plane bends, coplanar bends, and ...
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48 views

Invariants in chemistry used for model selection

What invariants related to geometrical structures that describe molecular geometry are used in chemistry? Explanation: Here, Electronic model with highest prediction rateā€¦, one can learn about ...
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1answer
77 views

IBrF2 - van der Waals repulsions - and number of unique bond angles

I understand that the molecule $\ce{IBrF2}$ is T-shaped, with three ligand atoms and two non-bonding pairs. However, how many unique bond angles can this molecule exhibit? My professor argues for ...
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1answer
54 views

Greater entropy: an atom or macromolecule?

A question that appeared on my last chemistry exam was : Which of the following has greater entropy A) An atom B) A macromolecule The question doesn't specify anything else(i.e. type/size ...
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1answer
32 views

Oxidation numbers of phosphorus pentachloride

I read detailed explanations of what oxidation numbers/ states represent and it boils down simply to this: If it's positive, it shows how many electrons the element lost, and in the case of a negative ...
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1answer
49 views

What is molecular system in general terms? What is a supramolecular system?

What is a molecular system in general terms? Could the solution of sugar in water be called a molecular system, if we were not interested in sugar-water interaction? Today Jean Marie Lehn told me ...
2
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1answer
80 views

How can a chemical structure be stored in a matrix?

How do I represent a chemical structure in a matrix format in Matlab? Can I input a chemical structure into Matlab using the S.M.I.L.E.S notation? I have to specify the connectivity of different ...
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56 views

What does 'organic/non-ogranic molecule' means exactly?

I am new to the organic chemistry world. I was delving for the exact answer to my question, and I've found some results: In wikipedia (french), is was mentioned that an organic molecule contains ...
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1answer
187 views

How does the pyramidalization effect the bonding angles in a distorted octahedral environment?

This is a follow up on "Generally Octahedral - Meaning?". Since Dissenter asked in the comments to my answer: I'm not sure why the $\ce{F_{eq}-S-F'_{eq}}$ bond angles would be compressed, even if ...
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1answer
56 views

Molecular orbitals and “generalized” aufbau principle for heteronuclear molecular configurations

Is there any general ordering or rule for heteronuclear molecules like $\ce{AX_2}$, $\ce{AX_{n}}$, and their molecular bonding/antibonding configurations ($\sigma/\pi$ orbitals) accordingly to some ...
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1answer
42 views

Relationship between Van der Waals forces and the boiling point

Choose the right answers in the following statement: The boiling point of a liquid substance is higher as the Van der Waals forces (in/between) the molecules of the substance are (lower/higher). I ...
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26 views

Argon chemistry, molecular geometry and hybridisation

Can Argon hybridize orbitals and/or form covalent-like/ionic-like compounds? Is there any study of that?I would be happy to read concrete references... What kind of molecular geometries for argon ...
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53 views

Any FREE chemistry software to view molecule pictures in explorer

I am testing my small api library that generates lots of chemical files such as MOL and SDF. I was wondering if there is a software that can show me the pictures of chemical structures inside each ...
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1answer
45 views

Calculate the number of moles of phosphorus in 15.95g of tetraphosphorus decaoxide

I've got this question and I cannot figure out how to get the correct answer. Calculate the number of moles of Phosphorus in $15.95\:\mathrm{g}$ of tetraphosphorus decaoxide. ($\ce{P4O10}$) I tried ...
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1answer
53 views

Existence of Hyponitrite Molecule

Does the hyponitrite molecule exist? I know the hyponitrite ion exists (http://en.wikipedia.org/wiki/Hyponitrite) but what about the molecule? I have found no reference to the molecular form on ...
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1answer
61 views

In which of the following chemical compounds are the building blocks molecules?

In which of the following chemical compounds are the building blocks molecules? (A) $\ce{AgNO3}$ (B) $\ce{HNO3}$ (C) $\ce{KNO3}$ (D) $\ce{NaNO3}$ (B) is the correct answer, but I have ...
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45 views

Reduce sizing of molecule - Oxygen

Can the size of molecule oxygen reduce smaller? If yes, how is that possible? Is it related to proton and electron surrounding the nucleus?
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1answer
65 views

Fractional Bond Order - How to Visualize?

Consider nitric oxide, which has a real bond order of 2.5, contrary to what this UC Davis rendering might imply: What's the best way to visualize a molecule with a fractional bond order? What ...
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249 views

What is there in this 3D representation of organic molecules I fail to grasp?

I think there's a basic idea I'm missing about 3 Dimensional representation of molecules. I think it may be about converting to Fischer representation. Consider the following two products of ...
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131 views

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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Calculating the mass in g of a molecule [closed]

If I have the amount of the molecule in moles, how do I calculate the mass of an individual molecule? For example, if the molecule was water?
3
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1answer
50 views

What attributes cause a substance to be nonconductive or conductive

I understand what causes elements to be conductive or nonconductive. But what causes a substance say rubber to be nonconductive at a molecular level?
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How to explain the concept of mol and reactions involving mol quantities

From time to time I do little pro bono lessons for second grade in math, physics and chemistry. Recently I came across this question. In a container is $2~\mathrm{mol}$ of $\ce{SO3}$ (sulphur ...
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3answers
124 views

Would decomposing an object into molecules be an environmental problem?

In a thought experiment, a friend proposed to me a machine capable of decomposing any object (e.g., a brick) into its molecules. I'm not a chemist or physicist, but my initial reaction was that this ...
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1answer
128 views

UV radiation on IBr (Radical Substitution)

I came across a radical substitution which Methane reacts with $\ce{IBr}$ to form iodomethane and hydrogen bromide and many more products. I understand the whole process but I don't quite see how the ...
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83 views

How does glue work?

Simple question. How does household glue work? How does it attach to almost any other compound? Thanks.
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1answer
69 views

what is the name of the molecule that has the greatest number of different atoms? [closed]

What is the name of the molecule that has the greatest number of different kinds of atoms? For example, H2O is water has 2 different kinds of atoms which are H and O. For example, C6H12O6 is ...
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1answer
84 views

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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1answer
50 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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55 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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1answer
364 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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238 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 ...
4
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2answers
249 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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76 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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121 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
76 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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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 ...