Consider the lewis structure of the following molecules. Indicate the VSPER geometry of each carbon atom in the molecules.
C-C-C-C- Part 3. Building Molecular Models The size and shape of molecules are as much a part of molecular structure as the order in which the atoms repulsion theory (VSEPR). This theory is used to predict the shape and bond angles of different molecules based on minimizing the repulsion forces between the electrons. The arrangement of electrons determines their molecular geometry (also known as shape). Recall that carbon can adopt one of three molecular geometries depending on the number of atoms bound to it: are bonded. Bonding arrangements are readily predicted by valence-shell electron-pair #AtomsCarbon is Bonded to Shape (Molecular Geometry) Tetrahedral Trigonal planar Linear 7. Consider the Lewis structures of the following molecules. Indicate the VSPER geometry of each carbon atom in the molecules. b. a. HC-CEN
Part 2: Construct the three-dimensional geometry for the molecules listed in Table 2.
Table 2: Molecular Models
Molecule (central atom is underlined)
Shape Name
Bond Angle
Bond Angles
(more than one may be possible)
CO2
Linear
AlCl3
Trigonal Planar
H2O
Bent
NH3
Trigonal pyramidal
CCl4
Tetrahedral
PCl5
Trigonal bipyramidal
SF6
Octahedral
Post-Lab Questions:
1. What is the molecular geometry (shape) of the methane molecule (CH4)? Explain completely why all the bond angles in methane are equal.
2. What is the molecular geometry (shape) of the chloromethane molecule (CH3Cl)? Explain completely why NOT all of the bond angles in chloromethane are equal.
3. Chloromethane can be thought of as resulting from methane via the replacement of one Hydrogen atom with a Chlorine atom. Subsequent replacements of H with Cl yield dichloromethane (CH2Cl2), trichlormethane (CHCl3) and tetrachlormethane (CCl4). Which of these three previous molecules will have all bond angles equal to each other? Explain completely.
4. Sketch the molecular shape of the compounds in the table below. Be sure to identify the bond angles. H2 Cl2 SO2 NH3 MoF6