Stahl, Molecule Modeling Post Lab - Ashlynn Stahl Molecule...

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Ashlynn Stahl 9/26/19 Molecule Modeling Post Lab 1)Explain why the bond angles predicted by the VSEPR model do not always match the actual bond angles in Spartan. The bond angles predicted by the VSEPR model do not always match the actual bond angles in Spartan because the lone pair electrons are always moving so it is hard to get an exact measurement of an angle. 2)Using what you have learned place the following molecules in decreasing bond angle size. PH 3 , SH 2 , and SiH 4 . (Hint: draw them out first, and compare to examples that you drew in lab on spartan) SH 2 > SiH 4 >PH 3 3)Explain the reason for the trend in the question above? The reason for the trend is because of the number of lone pair electrons. The bond angle increases as the electronegativity of the central atom increases, the bond angle decreases. 4)Explain why the H-C-H angle in methyl mono- chloride is larger than 109.5º even though it has a tetrahedral structure? The H-C-H angle in methyl mono-chloride is larger than 109.5º even though it has a tetrahedral structure because the Carbon is more electronegative than the
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Unformatted text preview: hydrogen so the electrons in the C-H bond will be pulled towards the carbon and on the other side Chlorine is more electronegative than the carbon so it is pulling the electrons away from the hydrogen side of the molecule and towards the chlorine atom which makes the hydrogen atom to more outward causing the angle to be greater. Name Molecular Formula Condense d Formula Bond for Angle Angle from VSEPR Angle from Spartan Methan CH4 CH4 Central C 109.5 109.47 Water H2O H2O H-O-H 109.5 103.98 Ammonia NH3 NH3 Terminal C 109.5 106.00 Ethane CH3CH3 C2H6 Terminal C 109.5 108.35 Pentane CH3CH2CH2CH2CH3 C5H12 Terminal C 109.5 107.01 Carbon Dioxide OCO O2C O-C-O 180.0 180.0 Acetylene HCCH H2C2 H-C-C-H 180.0 180.0 Acetic Acid CH3COOH C2H4O2 C-O-H 120.0 121.0 Ethyl Alcohol CH3CH2OH C2H6O C-O-H 109.0 106.90 Methyl Mono-chloride VH3Cl CH3Cl Central C 109.0 <CHClH = 109.08 <HCH = 109.86 n.a. ClC10OCH3 ClC11H3 Nothing to measure Nothing to measure Nothing to measure...
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