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Sch2101:Structure And Bonding Question Paper

Sch2101:Structure And Bonding

Course:Bachelor Of Crop Protection

Institution: Meru University Of Science And Technology question papers

Exam Year:2012

QUESTION ONE (30 MARKS)
a) Construct a molecular orbital diagram for ????2 + is this ion likely to be stable. What is its bond order. (4 Marks) b) Calculate the formal charge on each of the following electron dot structures.(3 Marks) i. Cyanate ion [N=C=O]- ii. Ozone O-O=O c) bond theory is better because of its simplicity, but the MO theory is better because of its accuracy. Best of all, though is a blend of the two theories that relevant example. (3 Marks) d) Draw the structure of EDTA. (3 Marks) e) Predict whether bonds in the following compounds are polar covalent or ionic. Their electro negativities are given in brackets) f) Why are molecular shapes important in biological chemistry? (3 Marks) g) i) Distinguish between lattice energy and bond dissociation energy. (4 Marks) ii) Given the following information, construct a Born-Haber Diagram and use to calculate lattice energy for CaC2. (4 Marks)
Net energy change for CaC2 formation = -60kJ/mol
Heat of dubtimation for Ca (s) = +178kJ/mol
??0 ?????? ???? ?? = +590????/??????
???? ?????? ???? ?? = +1145????/??????
Heat of sublimation for ???? = +717????/??????
Bond dissociation energy for ????????????(??) = +614????/??????
Eact for ??2 ?? = -315????/??????
Eact for ??2(??) = +410????/??????
QUESTION TWO (20 MARKS)
a) Using MO theory explain the magnetic behaviour for a) N2 and b) O2 and F2. (10 Marks) b) Using hybridization concept, clearly show how bonding occurs in i. Methane ii. Acetylene. (10 Marks)
QUESTION THREE (20 MARKS)
Using the VPSPER theory and electron doud concepts show how the following shapes are achieved in molecules. Use relevant examples appropriately
i. Regular tetrahedron ii. Octahedron iii. Trigonal planar iv. Linear v. Trigonal planar. (20 Marks)
QUESTION FOUR (20 MARKS)
a) Fully describe the following concepts i. Hydrogen bonding ii. Ligando and donor atoms b) Describe the rules involved in naming co-ordination compounds. (20 Marks)

Sch2101:Structure And Bonding Question Paper

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