Name: _________________________ Model Building Extra Credit Project
Chemistry
Introduction: A molecule can be represented on paper by either a molecular or
structural formula. A molecular formula indicates the number and kind of each atom. It
does not give the shape or actual arrangement of the atoms. Ex. H2O NH3 CH4
Structural formulas are 2 dimensional. They do not show angles true to the shape of the
molecule.
H


H—O—H
H—N—H
H—C—H

H
H
By using special notations, the following symbols can be used to show how the bonds are
in a 3-D figure.
A bond in the plane of the paper
A bond below the plane of the paper (dash)
A bond above the plane of the paper (wedge)
 
O
H
H
H
N

C
H
H
H
H
H
H
Part 1: http://video.gpb.org/video/2365090049/
1. Notes from video. Be sure to include:
a. What VSEPR is.
b. What the 5 VSEPR shaper are
c. A chart showing VSEPR name how many atoms are bonded to the central
atom, and how many unshared pairs
d. polar and non-polar
e. intermolecular forces
2. Draw the 5 3-D VSEPR shapes, name each shape and identify the bond angles.
a.Draw the Shape:
b. Draw the Shape:
c. Draw the Shape:
Name: _________________
Name:_______________ Name: __________________
Bond : __________
Bond :_____________ Bond: _________________
Name: _________________________ Model Building Extra Credit Project
d. Draw the Shape:
e. Draw the Shape:
Name: _________________
Name:_______________
Bond : __________
Bond :_____________
Chemistry
Part 2: Draw the Lewis Dot structure for each compound, then draw the 3-D model using
dashes and wedges. Identify the shape of the model and if it is polar or non-polar. Build
the model and take a picture of the model.
Draw Lewis Dot Structure
HI
CBr4
H2S
HCN
CCl4
3-D model
(dashes & wedges)
(Looks like model)
VSEPR shape
Polar or
Non-Polar
Name: _________________________ Model Building Extra Credit Project
SF2
PCl3
CH3Cl
CH2S
SCl2
Pictures: submit pictures of your models
Part 3: Quiz: answer the quiz questions from the video
1. ______________
2. _____________
3. _____________
4. _____________
5. _____________
Chemistry