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Title: Practice on VSEPR and Lewis Structures
Description: Practice on VSEPR and Lewis Structures
Description: Practice on VSEPR and Lewis Structures
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Name ___________________________________________ Period _____ Date ____________________________________________
Chemistry Honors
Molecular Models Part 1
Purpose:
This lab will provide a hands-on opportunity to see how electrons are shared to make covalent molecules and ions
...
Part 2 of the lab will show you 3-dimensional
shapes of those molecules and polyatomic ions
...
Materials:
Cheerios (or other representation of electrons)
Element Symbols
Periodic Table
Electronegativity Table
Procedure:
This lab will be done in 2 stages
...
Part 2 is steps 5-6 in the procedure
...
For each molecule or polyatomic ion, write the formula and determine the number of valence electrons in each atom and the
total valence electrons in the molecule or ion
...
2
...
Put
the LEAST electronegative atom in the center (except for hydrogen) and arrange the other atoms around the central atom
...
Take a picture of
the Cheerio model
...
Draw the electron dot structure
...
4
...
5
...
VOCABULARY TERMS
central atom –
1
...
in a molecule of 3 or more atoms, the one in the middle
in a molecule of 2 atoms, whichever one you choose
In the example below, the left fluorine atom was chosen
as central
...
Example
Fluorine gas
F2
Atoms Present (list each
separately)
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
F
7
4
...
0
Total # Valence Electrons
Electron Dot Structure
Simplified Electron Dot
Structure
14
Calculate the electronegativity difference (ΔEN) of the bond in this molecule
...
If the
bond is polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
0-4
...
0
non-polar
***
Dihydrogen
Atoms Present (list each
separately)
Formula _____________
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
Electron Dot Structure
Simplified Electron Dot
Structure
Total # Valence Electrons
Calculate the electronegativity difference (ΔEN) of the bond in this molecule
...
If the
bond is polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
Identify the bond as POLAR or NON-POLAR
...
***
Carbon tetrafluoride
Atoms Present (list each
separately)
Formula _____________
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
Electron Dot Structure
Simplified Electron Dot
Structure
Total # Valence Electrons
Calculate the electronegativity difference (ΔEN) of the bond in this molecule
...
If the
bond is polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
Identify the bond as POLAR or NON-POLAR
...
***
Oxygen Gas
Atoms Present (list each
separately)
Formula _____________
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
Electron Dot Structure
Simplified Electron Dot
Structure
Total # Valence Electrons
Calculate the electronegativity difference (ΔEN) of the bond in this molecule
...
If the
bond is polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
Identify the bond as POLAR or NON-POLAR
...
***
Nitrogen Gas
Atoms Present (list each
separately)
Formula _____________
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
Electron Dot Structure
Simplified Electron Dot
Structure
Total # Valence Electrons
Calculate the electronegativity difference (ΔEN) of the bond in this molecule
...
If the
bond is polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
Identify the bond as POLAR or NON-POLAR
...
***
Ammonium ion
Atoms Present (list each
separately)
Formula _____________ (include the charge)
# Valence
Electrons in
Each Atom
Electronegativity
of Each Element
Electron Dot Structure
Simplified Electron Dot
Structure
number of electrons added or
removed due to charge
Total # Valence Electrons
Calculate the electronegativity difference (ΔEN) of the bond in this ion
...
If the bond is
polar, show the direction of the dipole in the simplified electron dot structure using a colored pencil
...
Identify the bond as POLAR or NON-POLAR
...
H H H H S
H H H C
N N N O
OO F F
F F P Cl
Cl Cl Cl Cl
Title: Practice on VSEPR and Lewis Structures
Description: Practice on VSEPR and Lewis Structures
Description: Practice on VSEPR and Lewis Structures