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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 ...

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The potassium chloride molecule (KCL) has a dipole moment [closed]

The potassium chloride molecule (KCL) has a dipole moment of 8.9x〖10〗^(-30)C.m.a) Assuming that this dipole moment arises from two charges ±1.6x〖10〗^(-19)C separated by distance d, calculate d. b) ...
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2answers
91 views

Long linear molecule with alternating elements? [closed]

In the classic freshman physics text Electricity and Magnetism by Purcell, one of his first examples is the computation of the electrical binding energy of a $\ce{NaCl}$ crystal. He models the crystal ...
3
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2answers
44 views

Which has the greater N–O bond length, NO₂⁻ or NO₃⁻?

Which has the greater N–O bond length, $\ce{NO_2^{-}}$ or $\ce{NO^_3^{-}}$? I don't understand why the N-O bonds should be of different lengths in these two molecules (don't the same bonds have the ...
3
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2answers
133 views

Choose the molecule with the strongest bond

Choose the molecule with the strongest bond: $\ce{F2, Cl2, Br2, I2,}$ or all are equal. All of them are nonpolar-covalently bonded, so I had thought that the answer would be "all are equal". However,...
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1answer
81 views

Do molecules containing only carbon exist?

Why doesnt carbon forms bonds with itself to form a molecule. Carbon shows the property of catenation then why doesnt it form a cyclic molecule as : ...
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1answer
30 views

Are there gases that spontaneously combust when mixed with oxygen? [closed]

Is there a known gas that would combust by there mere action of mixing with oxygen? So, we could put this hypothetical gas in a balloon, and if the balloon popped, it would combust and explode.
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1answer
201 views

Discrete molecules [closed]

I came a across a passage in my textbook on Formula Mass topic which mentioned something about discrete molecules. Some substances such as sodium chloride do not contain discrete molecules as their ...
3
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1answer
110 views

How do I visualise bicyclo[4.4.1]undeca-1,3,5,7,9-pentaene?

While reading my organic chem book, I came across this compound: Since this is an exercise question, I do not know the name of this compound. I am unable to visualize this compound (how it looks out ...
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1answer
57 views

At what temperature can molecules no longer form?

// hyper simplistic terminology in use for the question - apologies. Molecules are formed by atoms bonding together, and those bonds have an equivalent energy. At what temperature does the thermal ...
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52 views

Calculate concentrations in a system made up of molecules in order to calculate ionic strength

I understand how to calculate ionic strength where there are concentration data in molality or molarity units available and where the system is made up of only two components. However, I have been ...
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1answer
78 views

How many molecules are there in 17.53 grams of NH4ClO4? [closed]

How many molecules are there in 17.53 grams of $\ce{NH4ClO4}$? I get to 1 mol = 118 then I get stuck.
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1answer
131 views

Why are long oxygen chains unstable? [duplicate]

H-O-H (water), H-O-O-H (hydrogen peroxide), H-O-O-O-H, H-O-O-O-O-H, etc. This is analogous to hydrocarbon chains, methane, ethane, propane, butane, etc. Note the Hydroxygen Chains satisfy 2 covalent ...
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61 views

How would you write the empirical formula of an ion?

How would you write the empirical formula of e.g. X2Y42-?
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1answer
50 views

Collision rates between two molecules in a liquid

How would I calculate the collision rate between kaolinite and amylopectin particles in a liquid with a density of ($\pu{1.01g/m^3}$) and a viscosity of ($\pu{0.000434 Pa s}$)? I know this is related ...
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1answer
101 views

Calculating the Radius of a Molecule

Assuming the molecule is a sphere, would the radius of amylopectin be $9.17*10^{-22}~cm^3$? I arrived at this answer by deriving the molar volume by dividing the molar mass ($828.72~g/mol$) of ...
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1answer
61 views

Finding molecules that you randomly create using a modeling kit

I recently bought https://snatoms.com/ (which is just a real-life modeling kit for atoms/molecules) and was just keen on learning about chemistry in general. I often randomly join atoms to make up ...
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32 views

What is the significance of defining the compoud like this?

These are two definitions of a chemical compound. First, "A compound is the result of two or more elements becoming chemically combined together. The elements react chemically, causing bonds to be ...
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2answers
879 views

What is the difference between ''1 C atom and 1 mole of C atoms?'' [closed]

Does 1 C atom mean 1 single C atom out of Avogadro's number of C atoms = 1 single C atom out of 6.023 X 10^23 numbers of C atoms? Does 1 mole of C atoms mean Avogadro's number of C atoms = 6.023 X 10^...
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1answer
77 views

What to say 'one mole of C atoms or one mole of C molecules?

What to say 'one mole of C atoms or one mole of C molecules in CO? Please point out if I am wrong here As we know, one molecule of CO = one mole of CO molecules = 6.223 X 10^23 number of CO molecules ...
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1answer
50 views

Is a non-compound molecule a chemical substance?

The Wikipedia definition of chemical substance states: A chemical substance, also known as a pure substance, is a form of matter that has constant chemical composition and characteristic properties....
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3answers
859 views

How is sulphur trioxide formed and why is it stable? [duplicate]

Structure of $\ce{SO3}$ (sulfur trioxide): In the molecule, if each oxygen atom shares two electrons with sulfur atom then how does the sulfur atom remain stable? It already has 6 valence electrons ...
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1answer
77 views

Calculate the formula, and moles

If $\ce{1.84\times10^{-4}}$ moles of element A was completely reacted with element B to create $\ce{1.231\times 10^19}$ molecules of $\ce{(A3B2)_x}$ a hypothetical compound, what is the value of x? I ...
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1answer
309 views

Do alkali metals not form diatomic molecules?

I know hydrogen forms a diatomic molecule $\ce{H2}$, where the electronic configuration of hydrogen is $\ce{1s}$. But why doesn't lithium also form a diatomic molecule? Its electronic structure is $\...
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2answers
467 views

Are the breaking of bonds simultaneously endothermic and exothermic? [closed]

I understand that energy is NEEDED to BREAK bonds. But don't chemical bonds already have some form of potential energy in them already? So wouldn't it make sense that even though energy is required to ...
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0answers
63 views

Can the friction of air disintegrate objects if they are accelerated enough?

Can an object be thrown so fast that the individual atoms or molecules separate in air? I mean if you could accelerate an object fast enough, would it disintegrate from the friction of air? If so, ...
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2answers
128 views

A mole of atoms is the number of atoms whose total weight equals the atomic weight?

My textbook says, a mole of atoms is the number of atoms whose total weight = the atomic weight. There's something in the definition that's confusing me. Now what is confusing me is: Atomic weight =...
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1answer
115 views

Identification of an aromatic compound for a quiz [closed]

I need help identifying this structure for a puzzle. Original text was blurry, so a white overlay was added for readability, though some fragments might be different. Any help or suggestions are ...
3
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1answer
45 views

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
2k views

Why do methane molecules have 15 degrees of freedom?

I've just been learning a little thermal chemistry including the equipartition theorem. As part of this, my textbook discusses how to figure out the degrees of freedom for different chemicals. The ...
15
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1answer
439 views

Are there molecules that take the shape of every platonic solid?

Methane is the simplest molecule I know of that takes the shape of a platonic solid — in this case, the tetrahedron. Wikipedia has a page on platonic hydrocarbons that includes molecules with ...
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1answer
218 views

How many isotopologues of water are there?

If ordinary water molecules can contain any of the three hydrogen isotopes, $\ce{^1H}$, $\ce{^2H}$, $\ce{^3H}$, and any of the three oxygen isotopes, $\ce{^{16}O}$, $\ce{^{17}O}$, $\ce{^{18}O}$, how ...
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1answer
78 views

What is the most complex molecule we can manufacture without the help of proteins? (soft queston) [closed]

What is the most complex molecule we can manufacture without the help of proteins? This isn't motivated by anything but curiosity about the state of chemical engineering. I realize “complexity” is a ...
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3answers
4k views

Determining the structure of N2O using hybridization

I have learnt how to determine the structure of molecules where only the central atom is hybridised like $\ce{ClF3}$, $\ce{C2H2}$, $\ce{PCl5}$, but in $\ce{N2O}$ it seems as though both nitrogen and ...
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3answers
420 views

How does a molecule search work by drawing in visual editor?

There are a lot of chemical search engines (such as ChemSpider's Structure search) that allow users to draw and search for a molecule. How does it work? Is the comparison of images used? Could you ...
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1answer
2k views

Valence Bond theory, VSEPR theory and predicting the shapes of the molecules

I read about the above mentioned theories then used them to predict the molecular geometry. However, I found that the shape/geometry of a molecule obtained from both the theories was same. For example,...
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1answer
275 views

Space filling model for nitrogen molecule

I want to make space filling model for nitrogen molecule. I've learned that van der Waals diameter is to be taken for atom radius. Since van der Waals radius for nitrogen is $\pu{155 pm}$ and bond ...
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1answer
199 views

Whats between molecules? [duplicate]

Okay, this will be tricky to explain. But, this is a question that i have been wondering about in quite a long time, okay lets get started, Molecules moves faster in higher temperatures and there will ...
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1answer
1k views

How to calculate average volume of a molecule? [closed]

The molecular weight of glucose-1-phosphate is $\pu{260 g/mol}$ and its density is $\pu{1.5 g/mL}$. What is the average volume occupied by 1 molecule of this compound?
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222 views

Measure the complexity of a molecule

Back in April, there was an article in new scientist discussing the work of Lee Cronin, who postulated that molecules of a certain complexity must be biological. Cronin has developed a way to ...
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1answer
198 views

Substances comprised of large molecules are liquids at room temperature?

I am looking for compounds that are liquid at normal temperatures and are physically very large, to be used in an ellipsometer adsorption experiment. I am currently working with decane. The candidates ...
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0answers
94 views

Why does increasing electronegativity difference result in decreasing density?

I've been collecting data and there's a very strong inverse relationship between electronegativity difference and density ($\pu{R^2}$ value of roughly 0.95 from my data). Is there any chemistry that ...
3
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1answer
42 views

How to add a color to vapors?

I want to add a color to vapors, like the vapor that comes out of glycerine when heated. Is there a chemical compound I can put into glycerine that makes the vapor colorful? Or is there a chemical ...
3
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1answer
4k views

Is SO3 an ion or a molecule?

Earlier I thought that $\ce{SO3^{2-}}$ (sulfite) is an ion with -2 charge but today I read on internet $\ce{SO3}$ (sulfur trioxide) is a molecule with no charge. How can this be possible? Please ...
3
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1answer
3k views

Lone pairs in MO theory?

I have learned that non-bonding MOs are lone pairs. However when considering the MO diagram for the $O_2$ molecule, I do not see any non bonding orbitals yet there are two lone pairs on each oxygen ...
3
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1answer
2k views

What is “mineral spirits”?

I'm working in a project, and for a specific thing, I need to work on a possible recovery of $\ce{HCl}$ in aqueous phase. I found a patent on the net in which they use an amine to make a complex with $...
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1answer
60 views

What does the first $1$ mean in $\ce{Li}_2 1 ^1\Sigma_g^+: (1s\sigma_g)^2(1s \sigma_u)^2(2s \sigma_g)^2$?

I am trying to learn the nomenclature behind molecular states and in (Demtröder, 2010) I came across this expression: $$\ce{Li}_2 \color{red}{1} ^1\Sigma_g^+: (1s\sigma_g)^2(1s \sigma_u)^2(2s \...
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1answer
5k views

How to determine relative polarity (basic procedure)? [closed]

I am taking AP Chemistry, and have noticed that I can identify a polyatomic polar molecule, but struggle to determine which molecule is the most polar given a set of several polar molecules. What ...
3
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2answers
199 views

Does firing a proton beam on water make it acidic?

Lets say I fire a proton beam upon the surface of water. Lets assume I do the experiment in an air-free environment and that the proton beam doesn't reflect off the surface of water. Now, protons, ...
5
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2answers
783 views

Partial Atomic Charge in GAMESS

In GAMESS, a calculation of optimisation gives data about partial atomic charges (like Mulliken or Lowdin charges). Can you please let me know how to calculate the other types of partial atomic ...
5
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1answer
180 views

Detecting a gas molecule moving through a small pinhole

Suppose I have the four DNA base chemicals - thymine, adenine, cytosine, and guanine. Imagine I turn each of them into a gas, make a "cartridge" of the gas for each chemical, and then have a "pinhole" ...