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Lab Report Document Molecular Geometry

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Barton Community College CHEM 1806: College Chemistry
LAB REPORT DOCUMENT: Molecular Geometry
UPLOAD this completed Lab Report Document to this assignment in canvas.
Introduction
The shape of a simple molecule can be predicted based on VSEPR (Valence Shell Electron Pair
Repulsion theory). Valence electrons of atoms are the bonding electrons; they are responsible for
reactions. Electrons are all negatively charged but form a special type of stability when they are
paired. The octet rule indicates that some of the atoms will form an octet of electrons. Pauli’s
Exclusion principle indicates that paired electrons will have opposite spin but Hund’s rule will keep the
electrons as far apart as possible. That is where VSEPR comes in. Practice using VSEPR and predict
the polarity of molecules using the geometry.
This lab will practice building Lewis structures, assessing the bond polarity, electron and molecular
geometry, and applying the molecular polarity.
Materials:
HERE: Insert a picture of your VSEPR model kit showing the contents in the model kit
2 toothpicks in parallel
to show a double bond.
¼ packing peanut as terminal atom
(smushed side)
Lone pair of electrons
represented by empty
toothpick

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Barton Community College CHEM 1806: College Chemistry
LAB REPORT DOCUMENT: Molecular Geometry
Attaching terminal atoms and electron clouds
Make models of the four sample compounds: CO
2
, H
2
O, NH
3
, CH
4
Take pictures of
these models to insert into the procedure section of your lab report document. Be
sure to include you in those pictures.
Post Lab Questions:
Predicting polarity
1. Using the four sample compound models made above (CO
2
, H
2
O, NH
3
, CH
4
)
Identify the polar covalent bonds.

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Barton Community College – CHEM 1806: College Chemistry LAB REPORT DOCUMENT: Molecular Geometry UPLOAD this completed Lab Report Document to this assignment in canvas. Introduction The shape of a simple molecule can be predicted based on VSEPR (Valence Shell Electron Pair Repulsion theory). Valence electrons of atoms are the bonding electrons; they are responsible for reactions. Electrons are all negatively charged but form a special type of stability when they are paired. The octet rule indicates that some of the atoms will form an octet of electrons. Pauli’s Exclusion principle indicates that paired electrons will have opposite spin but Hund’s rule will keep the electrons as far apart as possible. That is where VSEPR comes in. Practice using VSEPR and predict the polarity of molecules using the geometry. This lab will practice building Lewis structures, assessing the bond polarity, electron and molecular geometry, and applying the molecular polarity. Materials: HERE: Insert a picture of your VSEPR model kit showing the contents in the model kit ¼ packing peanut as terminal atom (smushed side) 2 toothpicks in parallel to show a double bond. Lone pair of electrons rep ...
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