Molecule Definition and 462 Threads

Hi, I am having trouble with this concept... "A mean speed (c) is calculated by multiplying each speed by the fraction of molecules that have that speed, and then adding all the products together. When the speed varies over a continuous range, the sum is replaced by an integral. To employ...

Homework Statement "A molecule has its dipole moment aligned with a 1.8 kN/C electric field. If it takes 3.5x10^(-27) J to reverse the molecule's orientation, what is its dipole moment?" Homework Equations Potential energy of dipole in an electric field U = -p*E = -p*E*cos(theta) U...

Hey, guys, I have just watced a fantastic animation of the microscopic process of sound wave traveling, in which model was described as many balls connected by springs. But the problem is what we learned in thermodynamics chapter is that there is no bonds between molecules in gas, then how...

Hello! 1. The problem statement and all variables AIM: Calculating persistence length P of a single dsDNA molecule from a data set of force F (to the molecule) vs. extension x measurements. Experimental background: pN forces were applied to a single dsDNA molecule spanned between two...

Here attached is a question from my exam. My TA removed 1 point out of 7 for a reason. Can anyone decipher for what? There's the writing in red but it is illegible to me. I don't understand to what he refers by 8 and 6 t or +, or whatever he wrote. http://imgur.com/igpyp8V Or can anyone write...

I came across this problem in University Physics: (a) Oxygen 1O22 has a molar mass of 32.0 g>mol. What is the average translational kinetic energy of an oxygen molecule at a temperature of 300 K? (b) What is the average value of the square of its speed? (c) What is the root-mean-square speed...

How do you solve a question like this ? :you can obtain a rough estimate of the following simple experiment-let a droplet of oil spread out on a fairly large but smooth water surface .the resulting oil slick that forms On the surface of the water will be approximately one molecule thick. Given...

This is a question in "Chemical Principles, 6th Edition, Steven Zumdahl": Bond energy has been defined in the text as the amount of energy required to break a chemical bond, so we have come to think of the addition of energy as breaking bonds. However, in some cases the addition of energy can...

Are there ANY possible photographic or other types of images of a water molecule? Or are they simply too small to get an image of? Thank you.

Hello PF Let's say I have a device with three layers, A, B, and C, where layers A and C are the anode and cathode. I can measure the IV curves from that device easily. Now let's say I added a fourth layer, D, in between A and B. Layer D interacts with layer B such that it increases it's...

Hello everyone. I was hoping someone could help me out with the following problem. I tried working it out, but I don't know if I did it correctly or if I missed an important point. It just seems too "short". it would be much appreciated if someone could go through my solution quickly and give...

Average kinetic energy of a molecule is = (3/2)kT Avg. K.E is directly proportional to temp.(T) only. As you increase temp of gas then K.E will also increase. In my book given that, Average K.E is independent of pressure, Volume or nature of the gas. When you increase the pressure...

I know that . Average kinetic energy of a molecule is (f/2)kT (for translational motion.where f=3 ) In my textbook given that... If the degree of freedom of the gas molecule is f then the average heat energy of each molecule of the gas is = E(avg.) = (f/2)kT which is same as the...

Homework Statement I have to name the particular molecule that i am looking at and fill in the blanks with that name.Homework Equations Choose from: 2-methoxybutane, 3-butene, 1-butene, butanal, 2-chlorobutane, ethylmethyl ether, butylmethyl ether, or 2-butanoneThe Attempt at a Solution The...

In his lectures on quantum mechanics, Feynman treats the hydrogen molecule as a two-state system to give a general understanding of the covalent bond. He starts with base state |1> as electron a in ground state of left proton and electron b in ground state of right proton and base state |2> as...

Homework Statement which functional group is present in aspatame molecule? Homework Equations The Attempt at a Solution why the carbonyl group COO- is not present in the diagram? I can find it in the diagram

Hi I have a simple question about HPLC regarding the pore size vs the molecule size of the analyte. Are there cases when it is desirable to have a pore size smaller than the analyte molecule size? In this case, the analyte will be eluted first, then the solvent will be eluted later...

Homework Statement The atoms in the oxygen molecule [O][/2] may be considered to be point masses separated by a distance of 1.2 x 10^-10 m. The molecular speed of an oxygen molecule at s.t.p. is 460 m/s. Given that the rotational kinetic energy of the molecule is two-thirds the of its...

Please look at the pictures. I do not understand why they have not included the resonance structure for that molecule for which all the double bonds are displaced is not included.

Hello, I'm currently writing a chemistry program. The user can create any kind of atom he can imagine, and then combine them into molecules. To properly calculate all the energies involved I need a formula to calculate the mass defect of a nucleus. I mustn't use empirical data to allow for...

Homework Statement Effective potential of atoms in molecule of IBr can be described as ##V(r)=V_0[(\frac{r}{a})^{-8}-10(\frac{r}{a})^{-4}]##, where ##a=1nm## and ##V_0=0.1eV##. Calculate the first three vibration states if the potential close to minimum is harmonic. ##M(I)=127g/mol## and...

Homework Statement A molecule of NaCl has a reflective potential ##C/r^n##, where ##n=35##. What is the frequency of radiated photon at oscillating transition of the distance between the atoms is ##r_0=0.236nm##. And what is the frequency if the transition is rotational?Homework Equations...

Hello, I'm working here with a model for a diatomic molecule. The potential is modeled as two finite wells. For a given distance between the wells, the energy of the ground state will be minimized. If you move the "atoms" closer to each other, the energy rises, and if you move them away from...

According to the Molecular orbital theory, diatomic oxygen should have σ2px (internuclear axis) and \pi2py and \pi2pz orbitals filled with two unpaired electrons, one at antibonding \pi2py and the other at antibonding \pi2pz. And of course, the 2s bonding and antibonding orbitals as well...

Is 1-butanol molecule a surfactant?

I have read several definitions that basically say a molecule is formed when two or more atoms join together chemically. And a compound is a molecule that contains at least two different types of atoms. All compounds are molecules but not all molecules are compounds. Examples of molecules...

Is there a material or chemical substance that would have a visable change of any kind when exposed to THC? For example-something I can put in a room and detect if anyone is smoking pot in that area?

Homework Statement Which is less polarizable in each of the following groups? 1) H2CCH2 or H3CCH3 2) CH4 or C2H6 3) Na+ or Na 4) Sb3- or S2- Homework Equations Polarizability is affected by the number of electrons, the distance of the electrons from the nuclear charge, and molecular...

Homework Statement Landau&Lifshitz Vol. Mechanics, p101 Q1Find the moment of inertia of a molecule of collinear atoms Homework Equations The Attempt at a Solution I defined the origin alone the orientation of the molecule. I_3=0 obviously. For I_2 I wrote I_2=Ʃm_b[x_b-\frac{Ʃm_a x_a}{μ}]^2...

Homework Statement A molecule consists of three identical atoms located at the vertices of a 45 degree right triangle. Each pair of atoms interacts by an effective spring potential, with all spring constants equal to k. Consider only planar motion of this molecule. What are 6 normal modes and...

Homework Statement A nitrogen molecule (N2) has a mass of 4.68 x 10-26 kg. It is confined to a onedimensional box of length L = 100 nm. What is the approximate quantum number n of the molecule if it has a kinetic energy equal to the thermal energy kBT at room temperature? What is n if it has a...

the heat causes the molecule to vibrate.how does the molecule vibrate in terms of angle formed by vibrating molecule and the direction of tranfer of heat in conduction, convention and radiation?

I often find those terms when dealing with material science but I can't teel precisely the difference or the definition of which of these terms. Can anyone help me?

Equations: 1. vrms = √(3RT/M) 2. PV = nRT 3.M = mNA I want to answer part a. I am given T,P, and the density of gas molecules (d). From equation 3. I want to solve for m. m = dV = d(nRT/P) m[NA] = M = d(nRT/P)[NA] = dNRT/P; N = nNA. From equation 1. vrms = √(3RTP/(dNRT)) =...

Homework Statement Polymers, such as rubberbands, are made of very long molecules, usually tangled up in a configuration that has lots of entropy. As a very crude example of a rubber band, consider a chain of N molecules which we call links, each of length l. Imagine that each link has only...

Hi I am currently looking for the wavefunction of the bonding orbital of the hydrogen molecule. Does anybody here know how this one might look like? So, since there is no complete analytical solution for the Hydrogen atom Schrödinger equation, I am currently looking for approximations of this...

Hello. I'm reviewing background information on Raman scattering and I've noticed that the polarizability scales with v+1 for Stokes transitions and v for anti-Stokes. Why is this and what assumptions are used in the derivation? An explanation or pointing me to a good reference would be...

Homework Statement I just had my textbook tell me ethylene is a planar molecule. Not wanting to regurgigate crammed information, I'm trying to understand why the molecule has to be planar. Why can't two hydrogen atons located on one side be oriented in a perpendicular way to the two other...

A little clarification on the two... Would you agree with the text of the following two screenshots? (I highlighted the relevant parts in red) Most important is, screenshot 1 so please address it first: But also curious is, screenshot 2: Are these accurate? Would something...

Homework Statement I've attached a picture of the molecule. The question: at which molecules (s) would it be likely that there would be a nucleophilic attack? Homework Equations The Attempt at a Solution The answer key says a and c, only. However, I think that b is nucleophilic because the...

I have an air molecule moving because of a sound wave. f of sound wave = 500 Hz wavelength of sound wave = 0.68 m How fast is the air molecule moving in its equilibrium position? Is it in equilibrium at V max? Would this be where the position = 0?

Homework Statement Please refer to the image Why is y 109 degrees?(given by my teacher) Homework Equations None. The Attempt at a Solution There are four atoms around the carbon atom, I assumed it to be tetrahedral. Why is that wrong?

So essentially, I'm trying to find the temperature at which growth hormone (GH) denatures. I've got a box of it and it says "refrigerate at between 2'C to 9'C". I'm keeping it at room temperature (it's not for use atm), but would like to find out how to know at what temperature GH would break...

How to get N2 molecule orbital theoretically with quantum chemistry program like GAUSSIAN !for example, how to get the picture attached? Thank you!

Generally the concept of dipole moment is used in neutral system, ie the total positive charge equals to the total negtive charge. Could the concept and also the calculation be used in charged system? For example, NaOH, (Na+)(O-2)(H+), we can calculate its dipole moment. Could I calculate...

What is the difference? I know about di and bi but not about bi and bis.

Hi, I'm interested in solving the Hydrogen Molecule for a school project (computational physics course) WITH electron interactions included. I'm thinking of calculating the bond length using some kind of variational method, but I'd also like to calculate the energy levels of the two-electron...

This is not a homework question.

Figure below shows the shape of a nitric acid (HNO3)molecule and its dimensions. Treating the atoms as particles, findthe center of mass of this molecule. a)I know that xcm=m1x1+m2x1+.../Total mass. The total mass in this case is 63 but based on the picture I don't know which mass I should...

I've attached the image. Is the naming of this molecule correct? If so, why is the methyl prefix necessary? The three carbon chain + the double bond makes it 1-propene... If not, would the correct name be methylethene?