Polarity and Molecular Shape Lab

Objectives

• Construct models of molecules
  
• Determine molecular shapes
• Predict polarity of molecules

Materials

• Molecular model kit

Procedure

• We built a model for each of the listed molecules on the back of our given paper.

CH4	BF3	C3H8	H2O
Si2H6	HF	CH3NH2	H2O2
N2	SeF4	C2H4	SiH2O
IF3	SF6	CO2	SO32

• Drew the three-dimensional structure for each of these molecules
• Then determine each of the molecules; shape, bond angle, polarity, and resonance

Results
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Molecular Formula	Lewis Structure	3-Dimensional Model	Shape	Bond Angle	Polarity	Resonance
CH4		row 1, cell 3	tetrahedral	109°	no	no
BF3		row 2, cell 3	triagular planar	120°	yes	no
C3H8			linear	120°	no	no
H2O			angular	109.5°		yes	no
Si2H6				108.9°	no	no
HF			linear	180°	yes	no
CH3NH2		row 7, cell 3	tetrahedral	120°	yes	no
H2O2		row 8, cell		row 8, cell 4	row 8, cell 5	no	no
N2		row 9, cell 3	linear	180°	no	no
SeF4			seesaw	row 10, cell 5	no	no
C2H4			planar	120°	no	no
SiH2O		row 12, cell 3	trigonal planar	120°	yes	no
IF3			T-shaped	180°	yes	no
SF6			tetrahedral	180°	yes	no
CO2			linear	180°	no	no
SO32-			trigonal planar	104.5°	row 16, cell 6	yes