1. ____ Exposing a molecule in state n to electromagnetic radiation of frequency
ID: 966027 • Letter: 1
Question
1. ____ Exposing a molecule in state n to electromagnetic radiation of frequency = (En – Em)/h will increase the probability that the molecule will make a transition to the lower state m with emission of a photon of frequency . 2. ____ For a certain system the wavelength of absorption for an absorption transition from level A to level C is 485 nm and the wavelength for an absorption transition from level B to level C is 884 nm. Therefore the wavelength for a transition between levels A and B is 1075 nm. 3. ____ A bound electronic state of a diatomic molecule has a finite number of vibrational levels. 4. ____ If the J = 2 to 3 rotational transition for a diatomic molecule occurs at = 2.00 cm, then the for the J = 6 to 7 transition of this molecule is 0.86 cm. 5. ____ For N2 and N2+, the N2+ has the larger e in the ground electronic state. 6. ____ For Li2 and Na2, Na2 has the greater rotational energy in the J = 1 level. 7. ____ CCl4 has 9 normal vibrational modes. 8. ____ Transitions between electronic states occurring with absorption or emission of radiation always have S = 0. 9. ____ The inverse of the operation is and the inverse of the operation C5 is i. 10. ____ N2, HBr, CO2, H2S, and CH4 have vibration-rotational absorption spectra. 11. ____ N2, HBr, CO2, H2S and CH4 have pure-rotational Raman spectra. 12. ____ For a system in thermal equilibrium, an energy level with a higher energy always has a smaller population than the lower energy level. 13. ____ Glow-in-the-dark paint is made possible by a phosphorescence phenomenon whereas Day-Glo paints use fluorescence. 14. ____ A population inversion cannot be achieved by simply heating a potentially laser-active material. 15. ____ It is possible to obtain blue fluorescence from a transition that initially absorbs red light. 16. ____ Cyclopentadiene easily accepts an electron to become cyclopentadienide (known as Cp). 17. ____ The ground date term symbol for technetium (IV) is 4F3/2. 18. ____ Carbonated beverages contain many bubbles when the container is open. 19. ____ A supersonic jet can be converted into a more parallel supersonic beam if it is ‘skimmed’ in the region of hydrodynamic flow and the excess gas pumped away. 20. ____ Many attractive interactions between molecules vary with their separation as 1/r6. 21. ____ Polarizability of a molecule increases at high frequencies. 22. ____ The mean interaction atom of P atoms of diameter d interaction with a potential energy of the form C6/R6 can be given by U = -2N2C6/3Vd3 where V is the volume in which the molecules are confined and all effects of clustering are discarded. 23. ____ The polarizability volume of a molecule can be determined from measurements of the refractive index of a gaseous sample. 24. ____ The potential energy of interaction of two rotating dipoles is directly proportional to the temperature. 25. ____ The Clausius-Mossotti equation is used only when molecules are non-polar. 26. ____ BaO is a covalent solid. 27. ____ There are two lattice points in a unit cell of a body-centered lattice. 28. ____ N2 is a covalent solid. 29. ____ The lattice of crystalline COCl2 is a body-centered tetragonal with 16 formula units per unit cell and has a basis consisting of 8 molecules. 30. ____ Each lattice point in a crystal has the same environment. 31. ____ No atom need lie at a lattice point. 32. ____ The basis must have the same stoichiometric composition as the entire crystal. 33. ____ A crystal lattice space cannot have a positive ion at one lattice point and a negative ion at another lattice point. 34. ____ The simple cubic lattice of Po has 52.4% empty space. 35. ____ Ar crystallizes in an fcc lattice with one atom at each lattice point. The unit-cell length is 5.311 angstroms at 0K. The nearest –neighbor distance in Ar(c) is then 3.755 angstroms.
Explanation / Answer
1. Statement is true
2. According to given energies (wave lengths), the system is operated between their electronic energy levels. the given transition values are wrong.
3. Statement is true
4. Statement is true
5. question contains inappropriate terminology "ve"
6. the statement is incorrect. While mass increasing for a diatomic molecule its rotational constant is decreases and thus its energy value decreases.
7. Statement is true. Non linear molecules having 3n-6 vibrational degrees of freedoms. n is number of atoms in molecule. 3(5)-6 = 9
8. No, emission of radiation causes stability to the system and thus randomness diminishes (S diminishes). Absorption causes unstability of the system then S increases.
9. the inverse operation of C5 is not equal to i. It is equal to C54
10. Among given molecules N2, CO2 are linear and with '0' dipole moment and they do not produce vibrational rotational spectra. Non zero dipole moment is required to produce vibrational rotational spectra.
11. For producing Raman spectra molecule should possess '0' dipole moment. So N2, CO2 molecules only produce the Raman rotational spectra.
12. Statement is true.
13. Statement is true. Phosphorescence is time delay emission (T1 - S0) and flourescence is instantaneous emission (S1 - S0).
14. Statement is true.
15. Statement is true.
16. No, Cyclopentadiene can easily liberate proton and aquires negative charge and thus obey Huckels rule, but it cannot accept electrom from others.
17. the ground state term symbol of Tc is 6S5/2
18. Statement is true (Bubbles are CO2).
19. No comment
20. Statement is true
21. yes. At high frequencies the dipole moment increases.
22. No comment
23. yes
24. Statement is true
25. Statement is true
26. BaO is ionic solid
27. Statement is true
28. N2 is covalent gas
29. no comment
30. Statement is true
31. Statement is true
32. Statement is true
33. Statement is true
34. Po cubic lattice has 52% occupied space
35. No comment
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