Download الرقم الجامعي

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
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