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TEAR THIS SHEET OFF THIS IS YOUR REFERENCE SHEET/SCRATCH PAPER page 1 Chemistry 112 Spring 2013 Name__________________________________ CLS EXAM II __________________________________________________________________ 100 points Show all your work. There are 8 pages to this exam (including reference) (16 pts) 1] USING VSEPR, Draw and name the molecular shape and predict the bond angles for the following: MOLECULAR SHAPE - Drawing + Bond Angle (Drawing - include all electron dots!) Be careful in your drawing! XeBr2F2 SI2 IF4+1 page 2 NAME OF MOLECULAR GEOMETRY Use correct spelling MOLECULAR SHAPE - Drawing + Bond Angle (Drawing - include all electron dots!) Be careful in your drawing! NAME OF MOLECULAR GEOMETRY Use correct spelling HSO3 -1 (An oxy acid!) (12 pts) 2] a) Draw all the resonance structures for NClOS Given: b) Assign formal charges c) Indicate the resonance structure is the most important and explain why. page 3 Cl O N S (56 pts) 3] Use the Valence Bond Theory to explain the bonding in the following molecules: a. BrI2 1- Electron box diagrams/ Energy diagrams b. NO2 Electron box diagrams/ Energy diagrams page 4 c. CH2S Electron box diagrams/ Energy diagrams (3) Contour Diagram - Label all the orbitals (s, p, sp2, for example), bond types ( or ), VSEPR name and bond angles page 5 d. XeCl2I2 Electron box diagrams/ Energy diagrams (3) Contour Diagram Label all the orbitals (s, p, sp2, for example), bond types ( or ), and bond angles page 6 e. HCP (1) The hybrid orbitals (2) Electron box diagrams/ Energy diagrams page 7 (22 points) 4 ] a. Draw the Molecular Orbital Energy level diagram for F21- Label all energy levels (atomic and molecular) – small 2p-2s interaction b. (1) Give the electronic configuration for F21-starting with (1s) (2) Give the bond order (3) What are the magnetic properities of (4) Use the above MO diagram to determine which has the highest Bond energy F21-or F2 +1 Explain why. page 8 F21- ?