Molecule Definition and 439 Threads

Its common knowledge that infra red radiation heats up an absorbing solid surface. That is,the em radiation energy is converted into translational KE of the particles of the solid. What happens in the case of an isolated CO2 molecules absorption? Can the EM energy be converted into increased...

Homework Statement A molecule of DNA is 2.17 micrometers long. The ends of the molecule becom singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.00% upon becoming charged. Determine the effective spring constant of the molecule...

Inter-atomic force in a Hydrogen molecule -- finding "spring" stiffness Homework Statement At about 2000 K the heat capacity (at constant volume =) increases to (7/2)k per molecule due to contributions from vibrational energy states. Use these observations to estimate the stiffness of the...

Homework Statement A chemical plant produces pesticide that contains a molecule potentially harmful to people if the concentration is too high. The plant flushes out the tanks containing the pesticide once a week, and the discharge flows into the river. The molecule breaks down gradually in...

Does anyone know where I can find information about using quantum mechanics on the diatomic molecule (E.g. Lectures on YouTube or just notes)? Thanks.

Hi, 1st year chem guy here...I'm missing this idea. Is it all based upon Electronegativity? I can see why HBr or HCl and other 2 atom compounds would be polar. 2 atoms with different charges or even sizes creating an un-even pull. I'm guessing H2O is polar as the 4 remaining electrons on...

Which size of the molecule is bigger? Water or oxygen? Can someone state out the size unit of these molecules And, can I find a meterial to separate this 2 matter but let one of it pass through the other? (Osmosis effect) Really appreaciate who can help out here, thx

Mechanical Energy of Amonia Molecule [SOLVED] Homework Statement The ammonia molecule has the tetrahedral structure shown in the figure (Intro 1 figure) . The three hydrogen atoms form a triangle in the xy-plane at z = 0. The nitrogen atom is the apex of the pyramid. The figure (Intro 2...

Homework Statement You place 83 moles of hydrogen gas in a balloon of volume 2.8 m3, and find the pressure to be 1.4 times atmospheric pressure. What is the typical speed of a hydrogen molecule? Homework Equations v=(sqrt)((3*Boltzmann Constant*T)/mhydrogen T=pv/nr The Attempt...

Hello everyone, Quick questions. What do they mean by different polarities in anti parallel DNA strands. Are they referring to some chemical polarity or simply the fact they run in opposite directions. I'm confused with DNA replication. DNA polymerase can only synthesize DNA in 5' to 3'...

Hello Everyone! I need help on this topic. Can anyone provide me some details on how to solve the problem? Thanks..

Hello If a molecule has two specific vibrational modes (eg. symmetric and antisymmetric stretching in H2O), and they occur at different frequencies, v1 and v2, then why is the absorption band associated with a combination of these two modes labelled "v1 + v2"? My intuition is that the H2O can...

What exactly does it mean for a molecule to be in an 'activated form?' How exactly does this correspond to its energy levels? By this I mean how UDP-glucose is an activated form of glucose, ATP is an activated form of orthophosphate, and acetyl CoA is an activated form of acetate. (I pull...

1. Homework Statement Consider a gas-phase N2 molecule. It's RMS speed is given by Vrms = (3kT/m)^(1/2) What speed would the gas molecule have if it had the same energy as a photon of the following wavelengths of IR, visible, UV and X-Ray electromagnetic radiation? lambda =...

Homework Statement Consider a gas-phase N2 molecule. It's RMS speed is given by Vrms = (3kT/m)^(1/2) What speed would the gas molecule have if it had the same energy as a photon of the following wavelengths of IR, visible, UV and X-Ray electromagnetic radiation? lambda = 1.000E4nm...

I know that placing a paramagnetic molecule inside a magnetic field will induce a magnetic force on the molecule from the unpaired electrons, but what will the effect be on the physical properties on the molecule (of any?) Specifically will the size of the molecule be changed? My understanding...

Homework Statement Which of the following are true statements about the above molecule ? a) The bond between carbon and nitrogen should be the strongest bond in the molecule b) The C-C bond should be the strongest bond in the molecule c) The C=O bond is more polar than the C-C...

Homework Statement Calculate Velocity of an oxygen molecule at height, where the temperature is -50C. O2 molecule: 5.4x10^-26 kg Homework Equations 1/2mC^2=3/2kT The Attempt at a Solution => 1/2 (5.4x10^-26) c^2 = 3/2 (1.38x10^-23) x -(50) => c2= 1.035x10^-21 =>c=3.21x10^-11 m/s...

Homework Statement Molecules of carbon monoxide are permanent electric dipoles due to unequal sharing of electrons between the carbon and oxygen atoms. The figure shows the distance and charges. Suppose a carbon monoxide molecule with a horizontal axis is in a vertical electric field of...

The researchers focused on a single molecule of pentacene, which is commonly used in solar cells. The rectangular-shaped organic molecule is made up of 22 carbon atoms and 14 hydrogen atoms. In the image above the hexagonal shapes of the five carbon rings are clear and even the positions of...

a water monomer has HOH angle of 104.5 and OH length of 0.98 , partial charges are +0.4 on H and -0.8 on O. The reported electric dipole moment for this monomer is 1.86D. I tried to calculate it and got 2.3 D. The way I do it is by multiplying the distance between the center of the H-H and the...

is there any contradiction between the two?

The speed of sound in the air is constant no matter what its frequency f is. Fine. But what is the speed of an air molecule which transmits that sound of frequency f? The higher the frequency, the higher the speed of the molecule, right? What is the equation which gives this velocity? (and a...

Homework Statement Heat is added until the rms speed of a helium atom has increased 50%. Find new pressure. (Not all parameters given.) Homework Equations rms = (3kT/m)1/2 mass of molecule = mass of mole/NA Then, mass of helium molecule is 6.6x10-26kg The Attempt at a Solution...

Can someone give me a clear picture of it's physical meaning? What does a molecule having dipole moment signify? All the explanations I've seen are very hazy.

Homework Statement Compute the rms speed of a nitrogen molecule of 35.0 celcius. Homework Equations V(rms) = sqrt((3RT)/M) The Attempt at a Solution I plugged in 8.31 for R and 308 K for T and 14.0 g/mol for M. I arrived at a solution of 23.4 m/s but this answer came back as...

Homework Statement Show that the frequency of oscillation, v, of a molecule is related to the form of the inter - atomic potential V(r) about the equilibrium separation, r =ro by the expression, v = (1/2pi).sqrt([d2V/dr2r=ro/(m)]) where m is the reduced mass Homework Equations None given...

How do you calculate the resonant frequency required to shatter a calcium or magnesium molecule?

Homework Statement a) Given the IUPAC name to the chemical formulas: {\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }} \left[ {CrC{l_3}{{\left( {N{H_3}} \right)}_3}} \right] {\left[ {Co{{\left( {N{O_2}} \right)}_6}} \right]^{3 - }} b) Give the metal oxidation state...

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...