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The Islamic University of Gaza Chemistry Department Fall Semester, 2009 - 2010 ......................................................... :الجامعي Inorganic Chemistry (A) 1st Mid-Term Exam Date: 17/11/2009 الرقم 20 ......................................................................... :االسم Answer All Questions: Q1- Which of the following electrons has the highest effective nuclear charge (Z*): a 3d and 4s electron in Mn or Co? ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Q2- Assign the term symbols for the ground-state electron configurations of the P and Cu atoms in the ground state. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Q3- Explain why the F– O –F bond angle in OF2 is 102o, whereas the Cl– O – Cl angle in OCl2 is 115o. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Q4- Consider the compounds: PCl5, CH3-, C2H2, BrCl2What is the geometry, hybridization and orbitals included in the hybridization? And assign the point group symbol for each of them? PCl5 C2H2 CH3BrCl2- Geometry = Hybridization = Orbitals = Point group = Geometry = Hybridization = Orbitals = Point group = Geometry = Hybridization = Orbitals = Point group = 1 Geometry = Hybridization = Orbitals = Point group = Q5- Sketch all the possible overlap patterns that result from combining the orbitals on atoms A and B. In each case, identify the symmetry (σ, π, δ) and type of molecular orbital (bonding, non-bonding, antibonding) that your drawing corresponds to. (Label the axes x, y, z in each case) a. a dxz on atom A and a dxz on atom B b. an s orbital on atom A and a px orbital on atom B ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Q6- Explain how effective nuclear charge determines the relative energies of the valence orbitals in an atom. Use the examples of Li versus F atoms to show the relative differences in the 2s and 2p levels in these atoms. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Q7- The bond dissociation enthalpies for the nitrogen–nitrogen bond in N2 and [N2]- are 945 and 765 kJ mol-1 respectively. Account for this difference in terms of MO theory, and state whether [N2]is expected to be diamagnetic or paramagnetic. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Atomic Numbers: N = 7, F = 9, Li = 3, C = 6, Br = 35, Cl = 17, Cu = 29, Mn = 25, H = 1, O = 6, Co = 27, P = 15, Good Luck 2