Molecular Definition and 545 Threads

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

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)...

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...

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...