Molecules Definition and 543 Threads

hello everybody do u know how to find the number of dative bondings in a molecule without drawing lewis structure?please help

I'm not sure this is the right place to post this question but here goes: In feynman vol.1 39-9 there is a situation where two molecules are about to collide in a CM frame, the frame has velocity Vcm and the two molecules have respective velocities v1 and v2, then there is no correlation...

I was wondering if there was a formula for the relationship between the charge of a molecule to its velocity and/or its weight. Time can be incorperated.

Homework Statement If the translationa speed of the water vapor molecules (H2O) in ir is 648 m/s, what is the translational rms speed of the carbon dioxide molecules in the same air? Both gases are at the same tmperature. Homework Equations V^2 = (3kT)/m The Attempt at a Solution...

okay. i have a test in chemistry tomorrow and I've been studying forever but I am really having trouble with some problems on the study guide. for example, one of the problems is 1) consider the reaction Mg(s)+I2(s)---->MgI2(s) Under which of the following reaction conditions...

How many molecules exist in one cubic centimeter of space at a pressure of 10^-15 atm and temperature of 20 degrees C?

What's the average speed of hydrogen molecules at room temperature and how do you figure it out? Is there an equation? thanks

[SOLVED] Rotational Kinetic Energy and distribution of diatomic molecules a) Calculate the total rotational kinetic energy of the molecules in 1.00 mol of a diatomic gas at 300 K. b) Calculate the moment of inertia of an oxygen molecule (O2) for rotation about either the x- or y-axis shown...

Given the following article: http://www.innovations-report.de/html/berichte/studien/bericht-96564.html What are "acidic water molecules"?

Homework Statement what is the difference between a steroid molecule, phopholipid, and fat molecule?Homework Equations discuss the general difference in their structuresThe Attempt at a Solutionphospholipids are asymetrical with a hydrophilic head and a hydrophobic tail and the other two are...

1. The mass of the deuterium molecule D2 is twice the mass of Hydrogen molecule H2. If the vibrational frequency of H2 is 1.35x10^14 Hz, what is the vibrational frequency of D2, assuming the "spring constant" of attracting forces is the same for two species? Answer in unit of Hz. Homework...

Hi. We have done some experiments on stretching of DNA strands. We want to expand our report with some physical modelling but we are having some problems understanding surface tension. We have read some introductive book about fuild dynamics and used wiki a lot but we still have problems...

[SOLVED] thermal physics Homework Statement a) What is the total random kinetic energy of all the molecules in one mole of neon at a temperature of 305 K? I got 3801.83J (b) With what speed would a mole of neon have to move so that the kinetic energy of the mass as a whole would be equal to...

[SOLVED] Translational Kinetic Energy Homework Statement (Q) Find the average translational kinetic energy of nitrogen molecules at 1600K. Homework Equations Translational KE per degree of freedom = 1/2kT. The Attempt at a Solution Since Nitrogen molecules are diatomic, it has 5...

Homework Statement Give the formula of a fluoride molecule that: is octahedral in shape is trigonal bypyramidal in shape is T-shaped ...etc The Attempt at a Solution Ok, I'm not really actually looking for an answer, because I already know the answers are SF6, PF5, and ClF3. And I have...

I am taking a second course in Quantum Mechanics right now, and one thing is bugging me... The wave function gives us the probability distribution of a particle being in some position. But which part of particle is it talking about? The center of the particle? But then how can you give a wave...

Hey, just wondering if i can get some verification with my answers. I need to find the number of molecules from a concentration that is 1.0x10^-22 M of AsCl3 in one mL. I divided my concentration by 1000mL to get it down to a concentration per mL and multiplied by avogrado's number. My...

Homework Statement Beginning Calculations in Physical Chemistry Barry R. Johnson & Stephen K. Scott Calculate the average number of collisions per second between N_{2} and O_{2} molecules in air @ 298K and @ a pressure of 1 X 10^5 in a room of volume V = 100m^3. (Assume air has the...

Not sure if this is the right place for this.The new nanotechology articles are fascinating. They said it is like a switch that is able to turn on and off without altering its shape. I was also reading that they had solved the puzzles of the mobius strip. are these discoveries related...

Hello, Piston question,i need to work out the time when no molecules are left in the gaseous system.. I have worked out the relative velocity..if i multiply that by the mean free path to get the diffusion coefficient am i getting any closer to the answer? I can work out the change in time...

What exactly happens to the gas molecules in an electric arc? Oxygen turns to ozone, methane turns to acetelyene.

Homework Statement A syringe of volume 20 ml has just been used and now lies empty on the doctor's desk. The pressure in the office is 100,000 Pa. Assume that the air is an ideal gas consisting of nitrogen N2 (80%) and oxygen O2 (20%) molecules. k=1.38×10-23 J/K and the molar mass of oxygen is...

Homework Statement In some diatomic molecules, the force each atom exerts on the other can be approximated by F = -C/r2 + D/r3, where r is the atomic separation and C and D are positive constants. Let delta r = r - r0 be a small displacement from equilibrium, where delta r << r0. Show that...

I need to write the lewis structures of two ionic compounds. Can anyone help me out? Thank you. 1) (NH4)2SO3 2) LiBH4

In the 1999 paper published in Nature by Markus Arndt et al entitled "Wave-particle duality of C60 molecules" he states: The fullerenes are of course in this funny state of superposition as they are 'falling'. Couple questions: 1. Is this drop of 0.7 mm identical to what any object...

Homework Statement Does the molecule in the file attached have an enantiomer? Homework Equations The Attempt at a Solution I think I can draw an internal symmetry plane to divide the molecule into 2 equivalent parts, but then again, it doesn't seem quite right to me. Building...

Homework Statement Suppose a closed vessel of volume V contains a mixture of atomic and molecular Oxygen. Will the volume of the vessel occupied by each species be equal to V? I have this doubt because in my book in order to determine the pressure exerted by each species they have taken the...

Hey, I am a gr11 student and I just did a lab, and I do NOT understand a thing. Ok, so I have hydrated Copper (II) sulfate, and basically I heated it up in a test tube in order to make it an anhydrous copper (II) sulfate compound My question is: -Is this a chemical or physical change...

:confused: Current vacuum technology can achieve a pressure of 1 * 10^-10 mm of Hg. At this pressure, and at a temperature of 30.0 C, how many molecules are in 5.00 cm3 ? ok so atomic number of Hg = 80 80 * 1.661 * 10^-27 yields 1.33 * 10 ^-25 which is the mass of one molecule...

I'd really appreciate it if someone could please give me some hints over how to do the following questions as I'm currently really stuck. 8. (a) What is the average velocity of the molecules in a gas? (b) Explain your answer. 9. Two moles of He gas are at a pressure of 105 Pa and...

which has more potential energy, a Br2 molecule or two separate bromine atoms? I put the molecule because the fact that it is both attracted and repelled by the charges increases its potential energy. I just want to confirm if I'm right.

Matter, mass, and molecules. Does all three always exist together no matter how much energy there is? Do molecules exist inside all matter? I think molecules exist in all matter. I have been researching, but have not found anything conclusive. I drew that conclusion long ago in school...

It can be shown that if a hamiltonian is invariant under space inversion and if an eigenstate is non-degenerate, then the state is either even or odd in each position coordinate. So if there is a perturbation given by a uniform electric field, which has: H_1 = - \vec E \cdot \left( \sum_i q_i...

hey guys, could you'll help me with the following problem... Inside the leaf of a plant, water vapour passes from the liquid phase to the vapour phase at the walls of the mesophyll cells, as shown in the figure. The water vapour then diffuses through the intercellular air spaces and...

does water molecules exist in KOH(aq)?

Take Nitric Oxide for example. When I've drawn out the Lewis structure, how do I know whether the unpaired electron belongs in the nitrogen or the oxygen? Are both variants of the NO Lewis structure acceptable? Furthermore, if both of these variants are accepted, is there a "resonance" of NO in...

Hi, you don't have to do this by yourself(if you do this, that would be really nice but we both would have to be online at the same time probably). But there is probably a link online which teaches how to draw molecules. Hint: the one where there are dashes signalling the bonds and atom's...

Hello In DNA, thymine and adenine molecules are attracted to each other. The solid lines show bonds between atoms in the same molecule and the dotted line shows bonds between atoms in different molecules. Atoms in the same molecule are separated by 1e-10 m. If the net charge on the H and N...

I mean, I know that they move faster the more energy there is, but why do they move at all in the first place? Would a single molecule move if gravity wasn't acting on it and it didn't touch anything else?

Hello :D How do chemists make molecules such as those in commercial products id est benzyl peroxide? -Thanks!

My text doesn't seem to talk about average separation of molecules, so I can only get so far with this problem. Help would be appreciated. The problem reads: From the average separation between air molecules at STP, and their mean speed, estimate how long it would take one molecule to move...

Hello, I was just taking a shower when this question came upon my mind, what would happen if all the electrons stopped their motion? And, I don't know, but when molecules are created, wouldn't it cut off a path of an electron from the side where atoms have been combined?

I have a few questions about polarity of molecules, first off i know that soaps/detergents have both a hydrophobic and a hydrophilic end which are essential to is operations but is there anything else about its shape or electronegativity that I am missing, like is it polar/non-poalr cause i...

I am a little confused. I was talking to my teacher a couple days ago, and he asked me to put the following three into order of velocity (greatest first): 1. Average velocity of the molecules in a gas (AV) 2. Most probable velocity of the molecules in a gas (MPV) 3. RMS (root mean square)...

First of all, sorry if I put this in the wrong board. Now, I have to do as much expreriments (for a school project) that would help to prove any information about molecules, that is very important to me, so if you know any experiments that would fit, then could you please write in here, or...

say for example, a question states that you have 18 g of H20 which is obviously one mole. now if they asked how many molecules of water you had, you would just multiply the one mole by avagadros number (6.022 * 10^23) to get that answer. if they asked how many atoms of water, would it be...

How we can face the speed of the molecules on the gas kinetics theory and the speed barrier of light ? because v=sqrt(3kT/m) were k is boltzman T = kelvin and m = mass of the element remember the huge T of the big bang

How is it that researchers are able to synthesize any complex molocuel, and know what it does? I mean is it just through random discoveries that biology is advancing or is there some other way? It is just the complexity of polymers is so great especially in cells. Even for relatively simple...

i know that the molecules in the "freedom" form that have charges equal 0. but i wonder why the molecules still moving to create the diffusion and the effusion? some one please explain to me. thanks:!)

:confused: What do you call a large organic molecule made up of repeating subunits? I would greatly appreciate it if someone could answer this for me. I am so confused. Please help. Thanks!