Molecule Definition and 462 Threads

hi guys, i need some help with the following questions relating to cross sectional area. thanks in advance! 1) when n-hexatriacontanoic acid, CH3(CH2)34COOH was placed in water, a complete monomolecular film was formed. if the length of a carbon-carbon single bond in the chain is 1.54...

i made a mistake, and fixed it, but I'm still wrong. I totally thought I had this one. Little help here. Homework Statement What is the minimum (nonzero) rotational energy of the ¹⁴N_2 molecule? Homework Equations E_rot = L * (L + 1) * E_0 * (m_e) / (4*M) M = (M_1 + M_2) /...

I saw "dressed molecule" in a paper about BEC, what is the meaning of it?

If I have O2, and I want to make it positively charged, don't I have to break the O2 bond and then ionize the two oxygen elements to get two positively charged Oxygen atoms? Is it possible to take away an electron from O2 and still have the O2 be bonded? It is not possible right?

Homework Statement In the rotation spectrum of 12C16O the line arising from the transition l = 4 -> 3 is at 461.04077GHz, while that arising from l = 36 -> 35 is at 4115.6055GHz. Show from these data that in a non-rotating CO molecule the intra-nuclear distance is s ~ 0.113 nm, and that the...

Homework Statement Determine whether each of the following molecules is polar or nonpolar. (Please note that lone pairs have been omitted for simplicity!) H I - C - I H Homework Equations Electronegativity, Polarity, Dipole moments The Attempt at a Solution It...

how to calculate the dipole moment of a molecule?? using electronegative values of periodic table ??

Hello! Quick question, but it's really bugging me! Exergonic reactions often yield polar molecules as the products (e.g. combustion of methane). Are these polar molecules 'favourable' because the electrons are spending more time in a lower energy region; or is this wrong, and there's a...

Homework Statement A triatomic molecule consists of 3 atoms arranged along a straight line. The molecules can translate and rotate but not vibrate. How many degrees of freedom are associated with this molecule? Homework Equations Molar Heat Capacity of Gases: Cv = f/2(R) f -...

Homework Statement Why is this statement false? 'Two moles of a substance at temperature T and pressure p has twice the entropy of one mole of the same substance at the same temperature and pressure.' --> Is it because the number of moles doesn't matter. Why doesn't it? Why is this...

i am stuck on this problem and was hoping someone could help.. If a double-stranded DNA molecule is 22% cytosine, what are the percentages of guanine, adenine, and thymine? Thanks

Please help me find an asymmetric center There are 5 asymmetric centers in this molecule. I think I've managed to find 4 of them, but where is the last?

1. A uniform square plate 7.2 m on a side has had a square piece 3.9 m on a side cut out of it. The center of the missing piece is at x = 1.65 m, y = 0. The center of the square plate is at x = y = 0. What is the x-coordinate of the center-of-mass of the remaining piece? 2...

Homework Statement Draw the Lewis Diagram for XeF2? Homework Equations The Attempt at a Solution EDIT: Maybe this isn't a charged molecule... How can 2 fluorines bond with Xe? Xe has no valence electrons to bond with! I guess you could do F-Xe-F, but still, the fluorines have nowhere to bond...

I read much about atoms, molecules and electrons but still i am not able to get answers for my study towards magnetic media. Please help me with the following questions in anyway you can, i would be really really grateful as it is going to help me a lot with my study towards magnetic media...

We were given a set of molecules and asked determine the most apporiate choice to be used in an LCD divice, I know that the molecules have to be polar but I don't understand how to find the most polar molecule.

Ok, so, I'm doing a little project on water molecules. More specifically, on, well as the title suggests, realigning them. Now, at first, i thought it had to do with magnetism, when in fact magnetism has to do with electron spin rather than charges. As I tried using an electromagnet, for the...

Hi, i was just wondering how to determine which molecule is more polar if you are given two, for example CHCl3 CHBr3 you can also draw a lewis structure, which i have, but it seems no help

The problem is this: Estimate the binding energy of the H2 molecule, assuming the two H nuclei are 0.074 nm apart and the two electrons spend 33% of their time midway between them. I assume that this problem uses the equation F=ke2/d. So far, I have that E1=F1d, and E2=F2v*t*0.33. Then...

Is this saying that the frequency of vibrations in a diatomic molecule is quantized? http://hyperphysics.phy-astr.gsu.edu/Hbase/quantum/hosc.html#c1

Homework Statement Translated from swedish so i hope i get it right... Observe vibrations along the axis of the bond in a hydrogen molecule (H2). For low temperatueres, by which factor does the rms value ("root-mean-square deviation") of these vibrations amplitude change if one of the...

Can someone explain if my understanding is correct- that temperature of say a liquid is proportional to the speed of the molecules? My idea is if there was a way to sort different molecules by speed, could you say in theory, take 1litre of water at 30degrees and pick out the fastest molecules...

A molecule of hydrogen. We assume that the only possible states of its two electrons (indistinguishable) are |A\uparrow\rangle, |A\downarrow\rangle, |B\uparrow\rangle and |B\downarrow\rangle (A=1s-orbital at atom A, B=1s-orbital at atom B). Formulate the 6 basis functions using the four...

Homework Statement The Hamiltonian for a rigid diatomic molecule is H_0 = {L^2 \over {2I}} where I is the moment of inertia of the molecule. (a) What are the lowest four energy states of this system? (b) An external electric field is applied, leading to a perturbation H_1 = ED\cos\theta...

Homework Statement [PLAIN]"Penicillin"[/URL] From the structure of penicillin above, would you expect it to be acidic, neutral or basic? Explain your answer as fully as you can. Homework Equations The Attempt at a Solution I think it would be acidic because of the -COOH. The -NH- can be...

Homework Statement A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy? Homework Equations PV=nRT V=nRT/P The Attempt at a Solution n=(.736)(1000)/16 = 46 V =...

I am currently undergoing a project for my undergraduate course in Quantum Physics on electron tunneling in the H_2^+ ion. Essentially, I am trying to model this situation in Fortran based on the variables that the user supplies (For example, the energy levels of the atoms, the separation...

Problem 10-58a: The equilibrium separation between the nuclei of the nitrogen molecule (N2) is 0.190 nm and the mass of each nitrogen nucleus is 14.0 u, where u = 1.66E-27 kg. For rotational energies, the total energy is due to rotational kinetic energy. Approximate the nitrogen molecule as a...

Homework Statement A molecule of DNA lies along a straight line. It is 1.12 μm long. The ends of the molecule become singly ionized; negative on one end, positive on the other. The helical molecule acts as a spring and compresses .4% upon becoming charged. The Coulomb constant is 8.99 X...

I know what an exited atom is : any of it's electron is elevated from the ground state. But I can't really figure out what is an excited molecule (e.g diene of polyene)... I have read molecules like diene or polyene can be excited and they absorb light wave for this as atoms do to send some of...

Here are some examples of wavefunction visualisations: http://upload.wikimedia.org/wikipedia/commons/c/cf/HAtomOrbitals.png I need the wavefunctions of the H2 molecule at 0 K, ie what the orbitals look like, whether they change with time, etc. Does anyone know the equations? Does...

Homework Statement The atmosphere is composed primarily of nitrogen N2 (78%), and oxygen O2 (21%). Find the rms speed of N2 and O2 at 293K Homework Equations Vrms=\sqrt{}((3RT)/M) The Attempt at a Solution Vrms, O2=\sqrt{}((3*8.31J*293K)/(32g/mol)) =15.11m/s When I looked at the...

[SOLVED] Electrostatic Force Homework Statement The dipole moment of the water molecule H2O is 6.17x10^-30 Cm. Consider a water molecule located at the origin whose dipole moment p_vec points in the positive x direction. A chlorine ion (Cl-), of charge -1.60x10^-19 C, is located at...

A stupid question: when we buy gas at the gas station, what is the molecule that makes up the gasoline? (I know there are additives so strictly speaking there is not a single type of molecule but I am wondering about the main constituent). Thanks

Homework Statement 2.0 moles of nitrogen (N2) gas are placed in a container whose volume is 8.4 10-3 m3. The pressure of the gas is 4.7 105 Pa. What is the average translational kinetic energy of a nitrogen molecule? average KEN2 = WebAssign will check your answer for the correct number...

"Size" of a DNA molecule? Sorry for such a beginner's question in an advanced profile forum: In basic school we were taught that a molecule of a substance is "the smallest structure which still retains all the properties of that substance. If you divide it any further, (at least some of) its...

The mass of a gas molecule can be computed from its specific heat at constant volume c_v (note this is NOT C_v) Take c_v=0.075\frac{cal}{g*C} for argon and calculate (a) the mass of an argon atom and (b) the molar mass of argon. I just finshed the chapter on Kinetic Theory of gases, but...

[SOLVED] conservation of energy Homework Statement From what height must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 200 K? Homework Equations conservation of energy Eavg=3/2KbT Epot=mgh The...

http://img176.imagevenue.com/img.php?image=24632_help-please_122_195lo.JPG" How is the hybridization on B (a nitrogen atom - refer to pic) sp3? I only see 2 bonds? how else can i complete an octet? Could someone explain the answers to me please..i have a day remaining before my exam..im...

Given the redshift z of a galaxy, how can one measure the temperature of a molecule in that Galaxy? ( Assuming it is heated only by the CBR) ?

Homework Statement Consider an electron of a linear triatomic molecule formed by three equidistant atoms. We use |\phi_A>, |\phi_B>, |\phi_C> to denote three orthonormal staes of this electron, corresponding respectively to three wave functions localized about the nuclei of atoms A, B and C...

We have Heteronuclear diatomic molecules with atomic masses m1 and m2 and an internuclear distance R have rotational energy eigenvalues EJ = BJ(J + 1) , J = 0, 1, 2, . . . when they are considered as a rigid rotor. The rotational constant is given by B = h^2/2µR^2 with the reduced mass µ =...

Hi, I have to determine the spring constant for a diatomic molecule. I have the frequency in cm^-1 which is 1395. I know the relation between the angular frequency and spring constant so I use the following relation: omega = 2*pi*c*v = sqrt(k/mu) so I isolate for k = mu*(2*pi*c*v)^2 mu...

Well, I did the problem. The problem is I KNOW my answer is wrong. Anybody have any idea why? (This is what I've worked out with my friend). Homework Statement Imagine a sphere of radius a filled with negative charge of uniform density, the total charge being equivalent to that of two...

ckg733 the so-called "anti-aging molecule" - how to control aging? I've heard ckg733 be called the "anti-aging molecule" and apparently it can reverse aging of cells? Could this be used to reverse/stop the aging of an organism? I mean if you can control the age etc of every cell you could use...

what happens to gas dipole molecule when electric field E is turn on ? a) is going to rotate to lined up with vector E and stay like that ? b) is going to oscilate, like pendulum, pointing on average toward E ? c) none of the above. d) is every collision going to flip molecule unpredictible...

Apparently physicists have been able to synthesize a molecule that contains two positronium atoms, an exotic form of atom that contains both positrons and electrons in its outer shell. They were able to monitor the properties of the molecule by the gamma rays let off after annihilation of the...

Hi. In my chemistry book, one of the questions was to name the given organic molecule. What was given was a benzene ring with a single -OH functional group attached. Immediately, i recognized it as phenol, but i also said its conventional name was benzenol. When i turned to the answers...

[SOLVED] Symmetrical Group of a molecule I'm trying to study PCl5, it have a bi-pyramidal shape, with The P atom at the center. I was able to find out the group it's D3h. 1)To what irreducible representations does The "p" orbital of Phosphor ( P ) and the five "1s" orbitals of Chloride belongs...

to whom may read this, i was desperately looking for a chemistry computer program which allows me to draw organic molecules, methane, trans-1,2-dichloroethene, cyclopentene, etc. with the bonds in them. Here is an example of what i would like the program to draw...