Molecular Definition and 545 Threads

I have never come across this term before in my few years of chemistry. At first, i thought it meant molecular shape, such as "trigonal planar" or linear. But apparently, that is not the case. Apparently, it is in some form of AX2E (2 being a subscript), but that's all i can find on the matter...

Find the electronic & molecular geometry and polarity of the molecule XeO3F2 For both electronic and molecular geometry I found to be trigonal bipyramid. The polarity of this molecule is Polar. Is this correct?

Just want to check that I have got understanding correct. To compute molecular polarizability need to use method such as Hartree fock(SCF), moller plesset, configuration interaction, coupled cluster etc. to get the wavefunctions and energy then just use sum over states formula.

Draw the lewis dot, identify the electronic and molecular geometry and determine the polarity of a) NO2Cl and b) SOCl2 a) N has 6 valence electrons O has 6(2) = 12 valence electrons Cl has 7 valence electrons Total : 25 For the Lewis Structure: (* is for space) O-N-O **| **Cl I...

1. I need to display the molecular & net ionic equations for the following reactions: 2. NH4NO3 > Na2CO3 NH4NO3 > NaBr NH4NO3 > Na2SO4 Ba(NO3)2 > NaBr Ca(NO3)2 > NaBr Ca(NO3)2 > Na2SO4 3. I don't really have any attempts because I'm completely lost on how to start...

Homework Statement Reductic acid contains 52.63% carbon, 5.30% hydrogen and 42.07% oxygen by mass. a) Determine the empirical formula of reductic acid b) If 1.23 g of reductic acid contains 3.25x10^22 atoms of carbon, what is the molecular formula of reductic acid ? c) Calculate the...

Homework Statement Give the structure of C8H8O3.Homework Equations IR tells us that there is an OH group and a C=O group Degree of saturation = 5 --> Benzene ring + C=O H NMR spectrum shows: Peak at ~7.8ppm integrating for 1H and is a doublet Peak at ~7.45ppm integrating for 1H and is a...

this is from a lab. i titrated NaOH into 2 grams of an unknown acid with NaOH the equivalence point was at 38.25ml so using 2 grams of an unknown acid and 38.25ml NaOH i have to find molecular mass of the acid. i tried adding 2 to 38.25, but i don't think that is right.

:cool: I'm doing my doctorate dissertation on the determination of molecular dimensions. I alredy know avagadro's constant and can understand the science of it, but the math is very complex and difficult to understand.:confused: I also need to know the different experiments that can be used...

Homework Statement A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25 g sample of the gas occupies a volume of 1.00 L and and exerts a pressure of 1.26 atm at -4.0C. Which of the following is its molecular formula? Variables: 30.4% Nitrogen 69.6% Oxygen M(sample)= 5.25g P=...

Hi. Can someone please help me find out the molecular geometry for the NH2CH2COOH-molecule, and tell me how they found it? Thank you so much.

Here is the problem. I have a series of questions that I don't know how to do. They are all basically the same so I will just give an example of one and if I could get a point the right direction that would be great! The molar mass of an important industrial solvent is 78.0 g and its...

The question is as follows: Gallium Oxide GaxOy forms when gallium is combined with oxygen. Suppose you allow 1.25 grams of gallium (Ga) to react with O2 and obtain 1.68 g of GaxOy. What is the formula of the product? Can you explain how to solve this problem any help is appreciated, thank you.

Homework Statement What are the molecular geometry structure? 1. SeO3 2. SeO2 3. SCl2 The choices are: a.linear b. square planar c. tetrahedral d. trigonal planar e. trigonal pyramidal f. V-shaped

Homework Statement I did an experiment and found the weight of CaC(2)O(4)H(2)0 to be 31.4966 subtracted by the weight of a crucible which is 31.2612. I put this for my weight of CaC204H20 (as I can't think of any other weight that it would be requested). I followed the next question...

Honors molecular biology homework help... please :) Hello, My daughter was given a honors project for Biology at her very small private high school (maybe 150 students total) It is on molecular biology (I think) She was given no workbook, no information, and no idea as to where to...

WOuld someone be able to give us a hand for this question, I am stumped. Polyethylene is a synthetic polymer or plastic with many uses. 2.06 g of a polyethylene sample was dissolved in enough benzene to make 100 mL of solution, and the osmotic pressure was found to be 1.86 torr at 25oC. What is...

I'm struggling to understand the basis for the following formula. The goal is to find the distribution of molecular speeds emerging from a smal hole in an oven where molecules are allowed to come to thermal equalibrium with the oven walls before exiting through the small whole. The book...

what is the pl of a molecule? What is the acid dissociation constant? Thanks in advance for any replies

Homework Statement The solubility of a gas in water decreases as temperature increases, and increases as temperature decreases. Using the kinetic molecular theory, explain why this is so. I would like an opinion please on my answer below. Is it a sufficient explanation? THANKS! :smile...

Homework Statement 6.0 cm^3 of a gaseous hydrocarbon was sparked with 34.5 cm^3 of oxygen. The volume of the gaseous products after cooling to room temperature was 22.5 cm^3. The volume was reduced to 4.5 cm^3 on passing the gases through aqueous potassium hydroxide. What is the molecular...

Hello sir and madam, I would be grateful if you can help me solve this question. 6.0 cm^3 of a gaseous hydrocarbon was sparked with 34.5 cm^3 of oxygen. The volume of the gaseous products after cooling to room temperature was 22.5 cm^3. The volume was reduced to 4.5 cm^3 on passing the gases...

This animation is amazing! It shows molecular interactions between DNA and other molecules. http://uk.youtube.com/watch?v=4PKjF7OumYo&feature=related How do you think they were able to get the information to create this animation? The molecular interactions could be mathematically...

Hello, If a magnetic field aligns the electron or nuclear spins can that have a macro effect of causing torque? So for example if we had a rod and we fixed one end but allowed it to freely rotate and then aligned electron or nuclear spins would that cause the rod to rotate? Thanks, Xerxes73

What's the difference between "Electron Domain Geometry" and "Molecular Shape"? Please help! Thanks

Does Maxwell Boltzmann hold for liquids? In the case of gases it does quite well for calculating the velocity distribution given a temperature. However, when the molecules are closer together in the case of liquids, how do the van der waals force and others effect the velocity distribution...

This may be obvious to some, but have you ever looked at yourself and went, "woah"? Self replicating strands of molecules have come an EXTREMELY long way. Does anyone wonder, "why?" Its like there's some form of driving force. (I don't mean evolution, that is the "how") I mean, why do these...

Homework Statement I just purified alkaline phosphatase, and my calculated molecular weight is 100000 g/mol, while literature value is 89000 g/mol. According to how others in my lab did calculations, my calculations are performed correctly, so I am left to explain why my purification is...

Helium has a molecular diffusivity three times greater than that for Argon. If a tank of water is charged with 0.5 atm of He and 0.5 atm of Ar and then allowed to stand in open contact wiht air, what percent of the Ar will have been lost when 10 percent of the He has been lost?

Hi- What is molecular level? I am running into questions that ask for such and such to be explained on a molecular level?

I've read info on it's operation but some questions are still unanswered. This is concerning reflux stills that create the reflux by condensing rising vapor at the top of the still. How does the still work on a molecular level?

Homework Statement Calculate the flux of oxygen across a square centimeter membrane [2\mu, or 2x10 ^{-6}m thick if the concentration on the right hand side of the membrane is 4mL/L and on the left side is 2mL/L. Homework Equations fick's first law of diffusion Flux = dC/dx = D[C2-C1] where...

I'm studying astronomy and I'm have these problems to solve, but there are a few things I don't really understand, hopefully someone can explain these things to me. 1. Why are spectra of molecules more complex than spectra of atoms? Is it because molecules can be excited in different ways...

I have seen the frequency of the electron in the ground state of the hydrogen atom as 6.58 x 10^15 Hz, however I have never been able to find the ground state frequency of the electron in the hydrogen molecular ion (H+). The equilibrium separation of the two protons is given as twice the Bohr...

Hey all, I'm looking for some suggestions on topics concerning Molecular Simulation which I can research. I've been tasked with giving a talk and writing a report on one specific topic of this field but I'm unsure what to specialise in. Any and all advise and suggestions would be appreciated!

Hi everyone, I came back to get some feedback from everyone. I am close to the time when my university requires that I choose a certain Subject POST or degree as some know it for my future three years in undergrad. Now I always loved Molecular Biology/Biotechnology since they are very much the...

[SOLVED] molecular orbital wavefunctions http://img255.imageshack.us/img255/7012/37626561fb6.jpg starting with Sz(total) = Sz1 + Sz2 Sz(alpha) = +(1/2)hbar(alpha) Sz(beta) = -(1/2)hbar(beta) I first found the determinant and then simplified psi =...

Homework Statement 0.1 dm^3 of a gaseous hydrocarbon may require 0.45 dm^3 of oxygen for a complete combustion to give 300 cm^3 of Carbon dioxide. All volumes are measured in the same environment. Calculate the molecular formula of the hydrocarbon. The Attempt at a Solution i tried...

Molecular visualization software?? Hello, I have recently started working in the field of biophysics and I need to produce some visualizations (pictures and movies) for the molecular coordinates that are produced by my simulation code. I am looking for visualization solutions for 1D, 2D...

I have one question about wave functions and molecular orbitals (MO). In the computational quantum chemistry scientists often use Linear Combination Atomic Orbitals (LCAO) to construct MO. \varphi_{i\lambda\alpha}(\vec{r})= \sum\limits_{p=1}^{N}\chi_{p\lambda\alpha}(\vec{r}) C_{i\lambda p}...

I have a possibility to simulate Molecular dynamics (MD). I want to find someone who need it. I propose to simulate ab initio quantum mechanical molecular dynamics (MD) using pseudopotentials and a plane wave basis set. The interaction between ions and electrons is described using ultrasoft...

when some molecules in a liquid gain enough energy to overcome attractive forces by surrounding molecules, they escape from the liquid surface. but when the vapor pressure becomes equal to atmospheric pressure, boiling is said to take place and all the molecules seem to gain sufficient energy...

Hi I was wondering if anyone can tell me how to find the bond order from a molecular orbital diagram. For example i found one on this website attached... "Comparison of the above energy level diagram wit hthat for nitrogen - you can see that the 2sg level lies lower than pu. Here...

[SOLVED] molecular orbital model I have a few quick questions: consider the structure of glycine a) indicate the hybridizations at each N and C atom in the molecule? I got sp3, sp3, and sp2 I don't have a problem with that question b) what is the total number of bonds in the...

http://www.jmeagle.com/plastic-pipe/pvc-pipe/ultra%20blue.html This is a product that I helped to develop. :approve: The expansion process is terribly tricky but we finally nailed it! It always gives me a thrill to see these things hit the market.

What is the difference between gram molecular mass and the molar mass? My book says that the gram molecular mass of oxygen is 32 grams and the molar mass is 16. Since a mole is equal to the gram molecular mass shouldn't they be the same?

This problem was proposed to us by our Chemistry professor. Consider a sample of a hydrocarbon at 0.959atm and 298K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.51atm and 375K. This mixture has a density of 1.391 g/L and...

Hey! This is for a 4th year undergrad project in Applied Molec Bio. I need an idea for a molecular biology-based, laboratory research plan. It needs to be an "original" idea but I'm having trouble of picking one... I will not actually be performing any experiments. It will contain...

Advanced Molecular Biology - HELP NEEDED! I am currently enrolled in an advanced Molecular Biology course and we have been assigned the task of creating a novel (not yet proved or studied) hypothesis regarding something related to the course. Additionally, we are required to provide an...

Not sure if this is the right place for this.The new nanotechology articles are fascinating. They said it is like a switch that is able to turn on and off without altering its shape. I was also reading that they had solved the puzzles of the mobius strip. are these discoveries related...