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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 4 Answer Molecular Shapes/VSEPR The lone pairs and multiple bonds are usually shown in this answer key. It is equally correct to draw a perspective drawing without showing lone pairs or multiple bonds (i.e. just represent the shape with wedged and dashed lines.) 1. Draw a perspective drawing showing the shape of each of the following molecules? (a) CO 2 (b) SO 2 (c) XeO 2 (d) SF 2 (e) XeF 2 OCO O S O O Xe O F S F F F linear bent bent bent linear (a) (b) (c) (d) (e) 2. Which of the following species have a regular tetrahedral geometry? (a) [NH 4 ] + (b) [BrF 4 ] (c) [BH 4 ] (d) SeF 4 (e) [IF 4 ] + The answers are A and C . H H N H H + F Br F F F H H B H H Se F F F F I F F F F + tetrahedral square planar tetrahedral see-saw see-saw 3. Identify the electron group geometry and molecular geometry of each of the species below: (a) IF 5 (b) AsF 5 (c) [ClO 3 ] (d) [CO 3 ] 2–
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CHEMISTRY 121 2 Department of Chemistry University of British Columbia I F F F square pyramidal F F As
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