Molecular Definition and 583 Threads

Hi, I'm having a lot of trouble with the following question. Answer: (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2py)2 (π2pz)1 If anyone can tell me how to obtain this answer, I would be very happy. Thanks.

Hi guys, I need some help with this question. What features in the molecular structure of a compound affect its solubility and its melting and boiling points. I need to answer this question with several examples and include structural diagrams. Please help

A compound has the empirical formula CNH4. If 0.2 mol of its molecules has the mass 12.0 g, what is the molecular formula?

i have a question. the problem is a compound contains only nitrogen and hydrogen and is 87.4% nitrogen by mass. a gaseous sample of the compound has a density of .977g/L at 710. torr and 100. degree celsius. what is the molecular compound. i have tried it a little by making the mass of...

A physics student measures molecular speeds in a laboratory apparatus and concludes that the distribution of speeds is such that: 10% have a speed of 200 m/s 10% gave a speed of 250m/s 15% have a speed of 500m/s 30% have a speed of 650m/s 20% have a speed of 900m/s 15% have a speed of 1300...

Hey everyone! I was wondering, when orbitals are hybridized, new hybrid Atomic Orbitals (AO) are formed. Now, when these hybrid atomic orbotals bond with another atomic orbitals, are molecular orbitals formed? For example, when 2 Hydrogens bond to form H2, the 1s orbitals overlap to form 2...

What evidence do we have that stars are forming right now? Molecular clouds? why do we know that molecular clouds are where stars form? any other lines of evidence? i know this is a big topic so a few reasons or a good link would be a good start for me to understand this big topic thanks

In a molecular orbital diagram that shows the bonding of two electrons (like a diatomic molecule), there are sigma and pi bonds, and the sigma and pi antibonds. Here is an example: http://www.westga.edu/~chem/courses/chem410/410_09/sld024.htm I don't understand how to determine where to put...

This might belong in Cosmology, but I'd thought I'd start it here. Astronomers Find Molecular Hydrogen At Edge Of Universe http://www.sciencedaily.com/releases/2006/05/060508112217.htm Well OK, but . . . No $#!t ! Thoughts?

what are the advantages of proteins aggregating together, forming molecular complexes?

what is the molecuar formula of CuSO4•xH2O? would it be CuSO4•5H2O?

I am going through Olivier Kahn's book "Molecular Magnetism". I am stuck on something that seems so simple. On page 10, it is stated that \chi=C\sum_{M_S=-S}^{+S}\frac{{M_S}^2}{2S+1} The book then states that this leads to \chi=\frac{C}{3}S(S+1) I've tried to figure the steps between...

The insecticide deildrin contains carbon, hydrogen, oxygen, and chlorin. 1.5100g sample of this compound is burned to produce 2.0938g CO2 (g) and 0.2855g H2O(g). They're half as many chlorine atoms as carbon atoms in the compound. The molar mass of the dieldrin is 381g/mole. What is the...

How do I determine or predict if a substance is molecular or ionic? PLEASE HELP! Thanks!

i also need help with the following problem: lactic acid (found in sour milk) has an empirical formula HC3H5O3. a 1.0-g sample of lactic acid requires 17.0 mL of 0.65 M NaOH (sodium hydroxide) to reach the end point titration. what is the molecular formula of lactic acid? thanks...

Hey guys, I am having a little problem with a problem I am doing in Physics (thermo chapter). Well, here is the problem: "The mass of the H2 molecule is 3.3e24 g. If 10e23 H2 molecules per second strike 2.0 cm^2 of wall at an angle of 55° with the normal when moving with a speed of 1.7...

I realize that IQ has been discussed on this forum to the nth but I also noticed that most everyone in those threads simply dismissed IQ as some triviality. But neuroscience (Not to be confused with Cognitive science, which is Behavioural Psychology of the mind) and other fields for that matter...

I am looking for some force field parameters for nonbonded forces between atoms. In most molecular modeling programs Lennard-Jones function is used to calculate Van der Waals forces where sigma and epsilon are constant values for a pair of atoms. But i cannot find them anywhere. Or if...

How big would a spherical cloud of molecular nitrogen at a uniformed pressure of 1 atm (1x10^5 Pascal) and a temperature of 300 K have to be for it to collapse under the mutual gravitational attraction of its molecules? i.e., What is the critical radius for Jean's collapse of a nitrogen cloud...

:confused: :redface: Hi got this question with which i need help For 1.0 mol of helium at a temprature 27deg C calculate:- i) the total kinetic energy of molecules, ii) the root mean square speed of the molecules

Hi, I need to calculate and visualize molecular orbitals (HOMOs) of few simple organic molecules (may be using DFT method). The molecules are positivly charged. Can anybody please help me with this calculations?

Hi. I have been trying to find the MO diagram for BrF5 since it is not in my textbook. I have been searching the web, and Google but I haven't been able to find anything, if someone knows of a MO diagram on the web I would be thankful If you would tell me where to find it.

never mind its over ! )

How many elements of unsaturation are implied by the molecular formula C8H10ClNO? Draw Three structure, one containing ether and amine group, one containing amide group, one containing amine and ketone group. I have no clue where to begin and read the chapter. I will be very thankful...

I am a junior at molecular biology and genetics and I plan to apply for grad school next year. So I need to take GRE general and subject tests, plus TOEFL. My main concern is about GRE: when should I start preparing for it? I would really appreciate advices also on how to study. Thanks! Gamze

:confused: HI I need some major help in creating a costume that illustrates a molecule involved in a process, can someone please help me i have to wear the costume in class tomorrow and am not allowed to make a model . I need some ideas as to what process is easy to do and how i can make a...

How would i calculate the weight of a mer, for example a mer of PTFE.

Hi ; Is there anybody using SageMD for molecular experiments. I am planning to set up a mail group for SageMD or all the molecular dynamics simulator software. Please write me if you want to join or if you know any other place for me to find anyone please tell me... Thank you all...

Hi Guys! my question goes like this a 5% solution of urea is isotonics with 0.877% of Solute A. Calculate the relative molecular weight of solute A. now my dear friend, i know its a very simple question but unfortunately, just can't getting any interpretation. I know isotonics sol...

Opinions on this one? Specifically for the QM uninitiated. If you have other recommendations for better clarity, please comment. Thx. A.

I can't figure out the molecular geometry for C2H4Cl2 (dichloroethane). The e- pair geometry seems to be tetrahedral, but I'm not sure for molecular. Any help?

i have been reading articles on molecular assemblies and dna design. my question is: if we take one simple living cell, and using molecular assembly we can create exactly the same copy of that cell (precisely to the atomic level), then will the cell be alive?:bugeye: thanks.

okay here's the equation: In a certain molecular structure, the total energy E between two ions is given by E= (-5.6/r) + 10e^(-r/3) where r is the distance seperating the nuclei. now i already sketched the graph but i don't know how to find the domain of E, or...

Please, can someone answer my question? I know the shape of sp hybrid orbital, but want to know about the others ( sp2,sp3,dsp2,dsp3,d2sp3,d3sp3 ). And are there any other type of molecular orbitals?

Concord Consortium, an educational non-profit, offers a free simulation program called Molecular Workbench, which can be used to learn physics, chemistry and biology through cool simulations. The main page to download the software is: http://workbench.concord.org/modeler/index.html...

I have searched the web for some movies available but I found none, I need them for my coming presentation, I really worried, please help me if possible. thanks a buch

ok thankyou malron,,,but what about molecular orbitals? the different shapes given for them are because of sharing of electrons where as the concept of finding a particle remains the same as in atomic arbital..i think i am correct,,.

What is meant by "molecular temperature"? Hello, I got into a debate with someone about the term "molecular temperature." I said "You can't define the temperature of a single molecule. It doesn't make sense." And they said. "But look at all these papers where people use the term...

Can anyone explain how a reaction force (for example the electrostatc force of the Earth on the stone, and the force of the stone on the earth) works on a molecular level? what is actually happening to *repel (if it does indeed repel??) the object

What are all the alcohols with that molecular formula?

I'm doing my bachelors of science in chemistry, but I may want to do graduate work in molecular biology instead of chemistry. Would a BS in chemistry and maybe 15-20 hours of undergrad biology be good enough to qualify me for graduate programs in biology? I will have a biology minor when I...

Hey all Why does Silicon Dioxide have a Giant molecular structure, while Carbon dioxide is made of simple molecules? They both have 4 electrons on their valence shells, so why wouldn't Silicon Dioxide be a simple linear molecule? (gaseous).

3. Which of the following is the molecular shape of the ion, ICl4-? A. Tetrahedral B. See saw C. Square planar D. Square pyramidal E. Trigonal pyramidal I drew the lewis structure, 4 chlorines bound to an Iodine. Iodine has 7, Each clorine has 7 with 35 total, the bonds...

When it says; "Molecular Weight: daltons (g/M)" What does daltons mean and what does (g/M) stand for? Does g/M stand for g/mol or what? How can they calculate Molecular Weight for nucleotides? Thanks for any inputs.

What is the molecular weight of potassium phosphate buffer pH 6.8 and pH 6.4? I tried to find the answer but no luck. Please help calculate. Thank you. :bugeye:

Hi friends. I am wondering about the next calculation. Imagine there is a hole of some diameter, through which it is discharging a jet of an ideal gas of molecular weight W_1 (Kg/mol). Outside, there is an atmosphere at rest of molecular weight W_2 (Kg/mol). The external atmosphere has...

Hi, Can anyone explain to me why IF5 is square pyrimidal and not trigonal bipyrimidal?

What are the rules for drawing Lewis dot diagrams, besides the 1) Carbon usually has a full octet 2) Some atoms become electron deficient, others electron sufficient 3) The Duet Rule 4) Link OH if written in the formula What the "other" rules? For example, i try to draw glucose...

Could some kind chemistry pro here tell me the energy required for molecular separation of water into H and O2? Thxs. :smile:

Hello. I am taking Organic Chemistry I and I purchased a Prentice Hall org chem molecular model set. I hate it! It is too hard to put the single bonds in the atoms. Can anyone recommend any others? Is it just my kit? I appreciate any help or recommendations! Thanks. -A