North Hollywood Polytechnic Community Adult School The Shape of Molecules Lab Report The instructions for this lab asks you to check out a molecular model

North Hollywood Polytechnic Community Adult School The Shape of Molecules Lab Report The instructions for this lab asks you to check out a molecular model kit from the stock room. The model kit is not required, but may be helpful in visualizing the shapes. So, if you have access to a molecular model kit, I encourage you to use it. Otherwise, you may proceed with the lab without one. Finally, in this attachment, I completed the expected answers for water as an illustrative example of how to do this exercise. Name: _________________________
The Shape of Molecules
Purpose: Determine polarity of molecules.
Check out a molecular model kit from the stock room. Check that the kit contains linear, trigonal
planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries.
1. Complete the following table and build the model for each. Show the model to the instructor.
Species
Valence
electrons
BeCl2
16
Lewis structure
Cl
Be
Electron geometry
Show angles
180 0
Cl
Cl
Linear
Be
Molecular geometry
Dipole moment
(If any)
Linear
µ=0
Cl
Cl
Be
Cl
non-polar
CO2
BCl3
NH3
H2O
Page 44
Name: _________________________
CH4
SF4
ICl3
PF5
SF6
Page 45
Name: _________________________
Questions:
1. Write the Lewis structure for ammonium ion. Determine electron and molecular geometries
2. Write three resonance structures for the nitrate ion. Determine electron and molecular
geometries.
3. What determines:
a) the electron geometry and
b) the molecular geometry of molecules or ions?
Page 46

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