Molecule Definition and 439 Threads

I am having a lot of trouble understanding the following: 1) How do I determine if the shape is a trogonal planar? Is it because it would have more bonds than the tetrahedral? 2)Is figuring the polarity of a molecule only based on the electronegativity? Please help! I have a big test...

A molecule with angular momentum L and moment of inertia I has a rotational energy E = L^2 / 2I. Since angular momentum is quantized, find the wavelength of the photons emitted in n=2 to n=1 transition of the H[SIZE="2"]2 molecule. This molecule has a moment of inertia I = 0.5mr^2, where m =...

A glycoside is a molecule where two (or more) molecules of sugar are bonded through either the keytone or aldhyde group and the anomeric carbon via an oxygen or sulphur atom. - Is this correct? If so, does that mean that glycosides are non-reducing sugars because they are bonded through the...

http://www.medpagetoday.com/Psychiatry/Addictions/tb/2680" Journal submission pertaining to newsarticle can be found here. http://download.neuron.org/pdfs/0896-6273/PIIS0896627306000456.pdf"

Is there any free software for rendering pics of molecules? I'm not looking for features or accuracy, I just want to whip together some atoms in shapes of my choosing (preferebly 3D, but I'll take what I can get). I tried PhotoShop and Illustrator, but it still takes a long time.

Raman spectroscopy is "Single molecule identification" Hi , I heard that the speciality of Raman spectroscopy is "Single molecule identification", it'd be really great if somebody can tell me HOW! because its surely going to be a question in my exam! Thanks in advance.

Different books seem to give different meanings to these terms although they are generally along the same lines. One book said that an ionicly bonded atoms such as NaCl cannot be labeled as a molecure and must be called a compound. Does this inturn mean that atoms bonded covalently cannot...

what exactly is that?

1) when trying to determine if a molecule is polar or nonpolar, how do unpaired electrons and double bonds affect it? for example, in CO3 (2-), its trigonal planar but one of the C=O bonds is a double bond...is this polar or nonpolar? 2) what do you do when you have an odd number of...

If a DNA molecule containes 28% thymine, what percent of it will be cytosine? will it be 72%? please help, thank you

Hi, I'm trying to figure out the formula for Sucralose, but this image is so small I can't make out the type. http://www.splendatruth.com/about_how.htm Can you tell what it is supposed to be? Also, are the OH groups hanging off the molecule called hydroxyls? Thanks!

for the following question: spectroscopic observation of molecular N2 in an electrical discharge shows that the relative numbers of molecules in excited bivrational states with energies given by (epsilon)i=(i+1/2)hv are i 0 1 2 3 ni/n 1.00 0.25...

:cry: :smile: :smile: :approve: :bugeye: :biggrin: :rolleyes: :rolleyes: :!) :redface: :cool: o:) :eek: :-p

A group has just published the details of their new nanocar; a single molecule with buckyball wheels. It only took several years of research to build it. Here are the specs: http://pubs.acs.org/isubscribe/journals/nalefd/asap/figures/nl051915kf00001.html And here's the results: the...

Hi All, I have always been made to understand that the reason why gas expands or causes pressure build up when heated in a sealed container is that gas molecules speed up when heated. If this is correct, can someone in the know please explain what is happening at the individual molecular...

what's the bonding and forces that exist in a water molecule?is it ionic bond and van der waals force?

There are probably reasons I don't understand on why this is not a valid question, and may have made some incorrect assumptions, but... If single monatomic molecule was at absolute zero then, as I understand it, it would have no kinetic energy - no motion. If heat energy were applied from a...

I am stuck in this gas problem: You are given a 10.00 gram solid mixture of Ca(ClO_3)_2 and Ca(ClO)_2. When this mixture is heated, both componds decomplse, releasing oxygen gas and leaving behind solid CaCl_2 When this 10.00gram mixture is sealed in a 10.0-Liter evacuated vessel and heated...

Is there any way to find the mass of a water molecule when only Avogadro's number is given? Thanks! - Kamataat

Is Carbon 60 :http://www.popmath.org.uk/sculpture/pages/jmv/example2.html the optimum volume for area of 3-D space? There are a vast number of geometric configurations of Uniform Polyhedra: http://www.mathconsult.ch/showroom/unipoly/list-graph.html But in Natural Selective, or...

What is the most complex extraterrestrial molecule known to us?

In a hydrogen molecule, the electron probability is the highest between the two nuclei of the hydrogen molecule. Let's say that the nuclei of the hydrogen molecule start oscillating. When they get closer to each other, will the electron probability decrease or increase between the two nuclei?

I found the problem of the ocsillating molecule interesting as well as the electron revolving around the nucleus, in both cases there is energy loss due to radiation and eventually the molecule will stop ocsilating and the electron will be together with the nucleos. the times when this happen...

If each molecule of acetanilide produces one molecule of hydroge bromide, what volume of HBr gas should be evolved from the reaction? So to solve this, ONE molecule of acetanlide will produce ONE molecule of hydrogen bromide... then, the molecular weight of hydrogen bromide produced will...

In a tank full of oxygen, how many molecular diameters d (on average) does an oxygen molecule travel (at 1.00 atm and 21.0°C) before colliding with another O2 molecule? (The diameter of the O2 molecule is approximately 3.60 10-10 m.) >> I don't know why webassign is telling me this is wrong...

In a crude model of a rotating diatomic molecule of chlorine (Cl2), the two Cl atoms are 2.00e-10 m apart and rotate about their center of mass with angular speed w = 1.40e12 rad/s. What is the rotational kinetic energy of one molecule of Cl2, which has a molar mass of 70.0 g/mol? >> I...

What would be an example of an element that is also a molecule? Would hydrogen be an example of this?

Hi, I'm confused once again about a spin problem. The nuclei in a hydrogen molecule are identical protons. Spin states can be ortho (triplets) with parallel spin or para (singlets) with antiparallel spin. What are the three lowest energies for the para and ortho hydrogen molecules...

Can we split the molecule yet>? I don't mean to spilt the atom causing a nuetron to become free, but cause a molecule chain reaction...>?

Consider the molecule CN, which may be described by a dumbbell consisting of two masses M_1 and M_2 attached by a rigid rod of length a. The dumbbell rotates in a plane about an axis going through the center of mass and perpendicular to it. Write down the Hamiltonian that describes the...

4. Demonstrate concept of hybirdization using the molecule H2CO3. Show electron configuration, hybird orbitals, hybird orbitals, a complete diagram, and sigma and pi bond (if any)

I posted this in the chemistry section, but I was recommended up here. We have a molecule with three unbonded electon pairs, so they will repel each other as much as possible. That's easy, it's 360º/3 = 120º However, when we have four unbonded electron pairs the angle is 109.5º How? I...

Hello, I have a molecule soluble in chloroform. I've tried to learn its pureness with thin lead chromatography on silica gel. After several tries, I've discovered that my molecule is best eluted with 9:1 CHCl3:MeOH (for now). I am not satisfied with the elution, the molecule does not advance...

Okay I am lost. My Professor has given me the formula ( C4 H8 Br2) and the signals 3.8(s, 2H) and 1.8(s, 6H). How the hell am I suppose to compose a molecule from that?? Any ideas? :biggrin:

This is a thought experiment question. I have three air molecules. Two have the same speed. The third is faster than the other two. When they slam against each other, they keep their previous speed after the rebounding acceleration. I put them in a container. I hold them from wanting to...

What is the most complex extraterrestrial molecule yet discovered?

basic atom & molecule physics After 30 views, I hadn't received any replies to this thread as posted in the "atoms" forum. Perhaps someone here can help me out. Thanks, Glenn 1. Why exactly does a covalent bond work? I understand how the electrons fill up the shells and so forth...

1. Why exactly does a covalent bond work? I understand how the electrons fill up the shells and so forth, but why does it work. Is the bond caused by the two atoms "competing" for the same electron that pulls them together? Is that a correct analogy? 2. Are electrons EXACTLY the same...

Here is the problem: A diatomic gas molecule consists of two atoms of mass m separated by a fixed distance d rotating about an axis as shown. Assuming that its angular momentum is quantized just as in the Bohr atom, determine a) the quantized angular speed, b) the quantized rotational energy...