Molecular Definition and 583 Threads

what is the difference between bond polarity and molecular polarity?

Yo, I don't understand the concept of the M.O. Theory and I don't know how to draw these diagrams. Are these closely related to Hybridization drawings and resonance structures? Please help me, I'm confused with all the bonding/anti bonding symbols etc. Thank you,

How do you determine the symmetry of the orbitals and whether they overlap in a molecular orbital diagram?

Dissolving on a molecular level... How do things dissolve eg in water? Thinking in terms of molecules, ions, etc, why does dissolving occur? Why do covalent molecules not dissolve in water but do in other covalents solvents, etc? As much help as possible would be appreciated. :-) Thanks.

What is the molecular formula of a compound which contains 92.3% carbon and 7.7% hydrogen by mass, if 0.39g of its vapour occupies an equal volume of .01g of hydrogen gas under identical conditions? I don't understand how to do this question. I can figure out the empirical formula... but I...

Howdy, I'm trying to calculate the angles between the repulsion of electrons. Well, it looks like a vector problem. Basically, can I just think of 360º between each of the individual the XY, XZ, and YZ planes. If I set everything up with generic variables to everything, will they drop out at...

Experiments show that rubbing an acetate strip with cotton imparts a negative charge to the strip. what are some of the attraction of some of the liquid streams to the charged strip. (The liquids being: water, 2-propanol, acetone) other experiments shown that a positively charged strip...

In the disease myathenia gravis, the body makes, by mistake, antibodies to its own actylcholine receptors molecules. These antibodies bind to and inactivate acetylcholine receptors on the plasma membrane of muscle cells. The disease leads to a progressive weakening of the patients motor...

I figured that since the bonding of elements is involved, this should be regarded as chemistry...but honestly, I am not sure which forum this should go. Anyway, my question is simple: Can anyone eplain the bonding and anti-bonding in MO theory to me? My textbook mentioned that the bonding...

can we post molecular biology questions here? (just to have something to type since i can't delete this post...BTW how can we delete our own posts?)

My professor wants the class to put some different chemical formulas in molecular structure while following the HONC Rule. He gave us six different chemical forumals to convert and I have finished five of them correctly; however, there is still one giving me trouble. Here is the given formula...

Hi, first of all I'd like to say hello as I'm new to this forum. Here are my questions: If a single atom would be held in an empty room (vacuum/no gravity) would it move or would it stand still? If it does move what would the movement would look like? The same question goes for...

Ten years ago (Science 1994;266:1021-4), Adelman built the first DNA based computer to solve the so-called Hamilton Path problem for seven nodes. SAT problems were solved with similar approaches by Lipton (Science 1995;268:542-5), with a DNA-based algorithm and Faulhammer (PNAS 2000;97.1385-9)...

Chemical Separation Using Ranque-Hilsch Vortex The full title for the post should be "Can molecules be separated in solution using a Ranque-Hilsch vortex?" I am a chemist, and my conventions re: aerosols/liquids may be wrong. My interest is in a system that might enrich a soluble analyte in...

Gas/liquid/solid in solid is irrelevant, liquid in gas is too dense to be bouyant, solid in liquid/gas and gas in liquid are easy. So I'm mostly interested in the liquid in liquid and gas in gas cases. Thanks.

How different/similar is molecular dynamics from rigid body dynamics? Could I use RBD software such as ODE to simulate MD? What assumptions/modifications would I need to make for this to work (e.g. treat atoms as rigid spheres connected through some special type of joints)?

What room-temperature gas has the greatest molecular weight?

What do people mean when they say molecular memory ? Thank you very much in advance,

Hi everybody, I'm about to apply for a program in molecular medicine and need to freshen up my Physics for the admissions exams... haven't had any Physics for 2-3 years :rolleyes: so I guess I'd better get busy. Most of the final score is math, chem and biology anyway (which I enjoy), but...

i need a online elementary tutorial on Molecular Dynamics (Mol. Stimulation, Forcefield, Surface ...)

what does a CO(subscript3)^-2 look like? (as in the drawing and the shape of the molecule?

Molecular dipole moment? What is a Molecular Dipole moment. My book explains it but i still don't get it. And here is a problem that ask me about it. Which molecule in each pair has the greater dipole moment a. SO2 or SO3 b. ICl or IF c. SiF4 or SF4 d. H2O or H2S Give the reason for...

Hello. I am currently living in Detroit and hooked on a syndicated radio program called CoasttoCoast. They deal with all manner of interesting topics - from the cosmos through to who killed JFK. It is a 5 hour long show broadcast night. The other day they had a guest who spoke at length about...

Post any questions you have about Molecular Biology in here (or anything related...Microbiology, lab techniques, experiments etc). Whether you want to know something specific (What is a nucleotide? for example), or something broad (What are RFLP's? for example). This thread could be useful to...

Hi I wonder if you could help me with the following multiple choice questions: [1] Which of the following does not have a dipole moment a) H20 b)NH3 c)CO2 D)SF4 E)BRCL5 Are we just suppose to know that the answer is CO2 or is there some simple way of working it out...

Analysis of a newly discovered gaseous silicon-fluorine compound shows that it contains 33.01 mass % silicon. At 27oC 2.60g of the compound exerts a pressure of 1.50 atm in a 0.250-L vessel. What is the molecular formula of the compound? I guess PV=nRT needs to be used. P,V,R, and T are given...

Is it possible to transform organic matter into light, by breaking the molecular structure, then re-asssemble it into its' original form? Is it possible to transform kinetic energy into light?

I would like to find out what Background radiation is. Is it really only from carbon-14 and potassium-40. Another question how can a formula be representative of both an empirical and molecular formula.

Fun for Molecular Biologists :) Seeking romance #1 I’ve been single-stranded too long! Lonely ATGCATG would like to pair up with congenital TACGTAC. #2 Menage a trois! Ligands seeks two receptors into binding and mutual phosphorylation. Let’s get together and transduce some signals...

I have been considering starting a series of threads (don't worry, there won't be too many of them) all relating to some Technical aspects of Molecular Biology. I have thought of doing this for 2 reasons. Firstly, some people might be interested in learning about various topics in molecular...

While learning about carbon nanotubes I ran into the term molecular orbitals. I know something about atomic orbitals but took chemistry a long time ago. I would expect the concept of molecular orbitals to be useful for covalent bonding like Silicon crystals and metals. I would expect it's...

This is pretty cool, in Science an article was published which describes a human polymorphism which protects us from the disease Creutzfeldt-Jakob disease and/or Kuru which are both caused by eating brains contaminated with a certain kind of protein, prions. A selection for this polymorphism...

Hello people, What are the advantages and disadvantages in using molecular thermodynamics instead of quantum mechanics with macro molecules? thank you.