Name Molecular Formula Lewis Structure Bond Angle calculated of Bonding Regions Nonbonding Regions central atom Total Electron Dense Regions central atom CO2 O C HCCH H2CCCH2 ClNNCl O HC H2C CH C CH2 N Cl N Cl NO3 O N OCO 180 2 0 2 HCC 180 2 0 2 CCC 180 2 0 2 ClNN 117 4 2 1 3 ONO 120 3 0 3 H 120 H HC CH4 HCH 121 1 3 0 3 HCH 109 45 4 0 4 HCF 109 45 4 0 4 HCF 109 45 4 0 4 ClCCl 109 45 4 0 4 HNH 107 3 1 4 HNH 106 95 HNF 106 46 3 1 4 HOH 104 5 2 2 4 CH H H 180 O O H2CCH2 Approx Bond Angles H C H CH3F H H F C H CH3Cl H H C Cl H CCl4 Cl Cl C Cl Cl NH3 H N H H NH2F H N H F H 2O H O H Revised SH 7 10 13 LaBrake Vanden Bout 2013 109 5 Name IMF Unit Understanding Shape STUDY THE DATA TABLE ON BACK AND ANSWER THE FOLLOWING QUESTIONS 1 How is the number of bonding regions around the central atom determined All types of bonds single double triple count as 1 bonding region 2 How is the number of nonbonding regions around the central atom determined Each set of lone pairs two electrons 1 Lone Pair count as 1 non bonding region 3 The bond angles listed on the table can be grouped approximately around what three values 180 120 109 5 4 What correlation can be made between the values in the last two columns of the table and the groupings identified in question 3 See edited table 2 Regions of electron density TOTAL 180 3 Regions of electron density TOTAL 120 4 Regions of electron density TOTAL 109 5 5 Using information from the data table sketch a 3 dimensional image of CH4 NH3 and H2O Use a word or short phrase to describe the shape you drew Dashed line going into the page away from you Heavy triangle coming out of the page toward you Straight normal line in the plane of the page 6 Use the clay and toothpicks to make the molecules in 5 See class video for a replay 7 A volunteer will make the electron domains with balloons Compare the molecular models with the electron region model See class video for a replay In short the electron regions truly fill a lot of space Revised SH 7 10 13 LaBrake Vanden Bout 2013 Name 8 Compare the electron region geometries of the following molecules CH4 NH3 H2O NO3 1 CO2 Regions 4 Revised SH 7 10 13 4 4 3 2 LaBrake Vanden Bout 2013
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