CHEM260_Lab_07_hll14

I have filled out the table with what I viewed on the simulator. I just need to know why they occur. Thanks!

how can i get a no. of rotational modes of N2 no. of vibration modes of N2 no. of microwave active modes of N2 no. of infrared active modes of N2

Which molecules below are rotational Raman active and which are inactive. O3 CH4 NH3 H2 H2O SiH4 CF6 C4H10

Three of the term symbols that correspond to a nd2electron configuration are 1S, 3P, and 3 Rank these in terms of increasing energy. 1S < 3F < 3P 3F < 3P < 1S 3P < 3F < 1S 1S < 3P < 3F What is the multiplicity for a state that has two unpaired electrons with parallel spin? 0 1 2 3 What is a selection rule for vibrational (IR) spectroscopy? The angular momentum must change by a value of ±1 (? = ±1) The change in vibrational state is ±1 (? = ±1) The molecule must have a permanent dipole The molecule must be anisotropic

This question pertains to the heteronuclear diatomic 1H19 Given that the bond length of 1H19F is 0.91 angstrom (1 angstrom = 10-10m), calculate the moment of inertia. Calculate the rotational constant (in J) for the diatomic in part a. Using your value for the rotational constant in part b, determine the energy of the transition from state 3 to state 4 (in J). Do you expect the energy of the transition from state 3 to state 4 for 2H19F to be larger or smaller than what you computed in part c, assuming that the bond length does not change? Explain your choice based on the relevant equations, or calculate the energy for this transition.    Steps 1, 2 and 3 have already been found. I need help with the last question only but I haven't been able to get it solved since there can only be three questions answered. The following answers for step 1-3 are below.  1. moment of inertia = 1.30 × 10-47 kgm2 2. rotational constant = 21.5 cm-1 3. Energy required from transition n= 3 to n= 4 is…

From the list of molecules below, select those that are classified as "spherical rotors". CgHg, cubane (cubic symmetry) CHC13, chloroform CH₂Cl2, methylene chloride CC14, tetracholomethane C6H6, benzene

Using the particle in a box model to describe energy of pi-electrons in CH2=CH- CH=CH-CH-CH₂ estimate the wavelength for HOMO-LUMO transition in this molecule. Assume the length of the molecule L-0.7 nm. Choose the answer closest to your estimate in nanometers (nm). 231 nm 196 nm 512 nm 250 nm 356 nm

What is the value of S and the term symbol for the ground state of H2?

If a hypothetic vibrational motion of a molecule can be described by Tvib = 2A1 + E, within the point group Cav, how many bands/peaks would you expect to see in its IR spectrum? Explain your reasoning. C (4mm) E 2C, C, 20, 20, h=8 A, 1 1 1 1 x + y', 2 1 1 1 A, B, B, 1-1 -1 R. 1 -1 1 -1 x- y 1 -1 1-1 xy 2 0 -2 0 (x, y) (R, R) (2x, y2) 3.

An SF6 molecule has I = 3.07 x 10-45 kg m2. What is the minimum energy needed to start rotation?

P-Chem question: Assume there are two pairs of harmonic oscillatorcs A-A and B-B. If A and B are isotopes, given mB=3mA, a.Express the ratio of their vibrational frequencies in terms of mA b.Given force constant of A-A, kf, express the absorption wavelength between adjacent energy levels

Determine the symmetries of the vibrations for SF4 by doing a complete 3N analysis. How many infrared-active vibrations do you expect for SF4? Character tables are available here.

You are considering purchasing a new NMR instrument so that you can do H1 NMR. Suppose one instrument would provide a magnetic field of 10T and another would provide a field of 3T. For a given molecule, would these two instruments have two different absorption wavelengths between spin states? If so, calculate the two different wavelengths that would cause absorption, ignoring the itnernal magnetic field of the molecule.

Without doing the calculation, which member of each pair do you expect to occur at the higher frequency? Q) C=O or C=C stretching

3. If a hypothetic vibrational motion of a molecule can be described by Tvib = 2A1 + E, within the point group C4v, how many bands/peaks would you expect to see in its IR spectrum? Explain your reasoning. C, (4mm) E 2C, C, 20, 20. h = 8 1 1 1 1 x² + y', z2 A, 1 1 1 -1 -1 R_ B, 1 -1 1 1 -1 x² – y? B, 1 -1 1 -1 1 xy 2 -2 0 0 (x, y) (R, R) (zx, yz)

Which rotational quantum numbers (J" > J') could be associated with a Raman S₂ rovibrational line? A) 21 B) 20C)2→3D)2→2E) 24

Do not give handwriting solution.

Which of the following bonds would you expect to have the largest frequency of vibration? Α) 1Η-1Η Β) 2Η-2Η C) 1H-79Br D) 1H-12C Ε) 12C-16Ο

Payal

The “signature” infrared absorption that indicates the presence of a C-H stretching motion in a molecule occurs at wavelengths near 3.4 × 10-6m. Use this information to estimate the force constant of the C-H stretch.Take the reduced mass in this motion to be approximately equal to the mass of the hydrogen atom (a good approximation when the H atom is attached to a heavy atom).

What is the number of possible allowed electronic transitions for carbon atom? Electron configuration ¹D зр S-S coupling L-L coupling ¹So ¹D₂ ³P₂ ³P₁ ³Po L-S coupling Energy

what are the values of k1 and k2

Q1 :A With reference to the 3f 1d 3p 1g and Is terms of a d2 configuration ,explain how you can use term symbols to gain information about allowed electronic transitions. wna W wwwon

Calculate the degeneracy of the following electronic configurations: Please explain each step (1) p3 d1 (2) d3 (3)1s1 2s1 (4) f