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- How can I explain "why you obtain more XRD peaks when the symmetry is converted to lower symmetry. (Ex. From cubic to orthorhombic)"What is the symmetry element corresponding to (a) Cn, (b) s, (c) i, (d) Sn? What is the symmetry operation corresponding to ?53?Under C4v symmetry, which irreducible representations, if any, correspond to an IR active vibration and which ones correspond to a Raman active vibration? And which ones correspond to an IR active vibration under D2h symmetry?
- What is the difference between a symmetry element and a symmetry operations in symmetry and group theory. I understand that C2 axis is a symmetry element or the inversion centre i is. I am confused whether an improper axis S4 for example is its own unique symmetry element? Is it not just a combination of C4 and sigmah (Couldn't find the sigma symbol.)How many vibrational modes does an SO3 molecule have a) in the plane of the nuclei, b) perpendicular to the molecular plane? c) Classify them by their symmetry type.Give an explanation of the semi-empirical mass formula and its symmetry term
- (b) Identify the symmetry elements of CO₂. Then consider CO₂ as being constructed from a carbon atom and an O2. Show whether your fragment orbitals are symmetric or anti-symmetric with respect to each of these. (c) Using the symmetry from part (b) identify which fragments can interact together and construct the corresponding molecular orbitals. To simplify this process, you can ignore the 20 orbital from O₂.- Give two examples of reflection symmetry and radial symmetry in nature. - Write the first 20 Fibonacci numbersFor the molecules below determine all the symmetry elements and the symmetry point group. a) H2O. b) NH3. c) CCl4. d) CH2Cl2. e) Furan. f) XeF4. g) SF6 h) cis-dichloroethene. i) trans-dichloroethene. j) eclipsed ferrocene. k) staggered ferrocene. l) CHClBrF.
- How many symmetry planes and symmetry axis in C3H8O. also is there a center of symmetry in C3H8O?The structure of [NO3]-is either trigonal planar or trigonal pyramidal draw both possible structures and determine the point group for each. Which irreducible representations represent the translational and rotational modes for each possible structure of [NO3]-? Which irreducible representations correspond to the vibrational modes for each possible structure of [NO3]-? How many degrees of freedom would you expect for each structure of [NO3]-? Calculate T-vibrationaland determine which modes you expect to be IR active for each structure.How many normal modes of vibration are there for (a) NO2 (b) N2O, (c) cyclohexane. (d) hexane?