First thing: Please be Ready with
iclickers out, everything else put away.
(Candy/Toothpicks can stay out)
For Credit iClicker Quiz
Open Note:
You may not use: Phones, books, ipads, computers or your
neighbor
• Given the structure of OF2 answer the following
questions:
• 1) What is the coordination number of O?
• A) 2
B) 3
C) 4
D) 5
E) 6
• 2) What is the steric number of O?
• A) 2
B) 3
C) 4
D) 5
E) 6
Please turn off all downloads. You can usually pause them by clicking on them and clicking pause. Facebook
and youtube are officially banned during class time
(this is not me micromanaging, it’s a legit internet issue as told to me by OIT).
• Visit: https://checkin.ics.uci.edu/
• Log in and select Chem 1A.
• When prompted, type the word of the day: vsepr
• Ensure when asked if you will share your location you select “allow”.
• Visit: https://learningcatalytics.com/
• Sign in MasteringChemistry account name
• When prompted, type session ID: NO LEARNING CATALYTICS
Visit: https://checkin.ics.uci.edu/
Word of the day: vsepr
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Remember back 5
rows of even side
are no seating zones
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SOME DEFINITIONS
• STERIC NUMBER: # BONDS+# ELECTRON PAIRS
• COORDINATION NUMBER: NUMBER OF BONDED ATOMS
Steric #: 4
Coord. #:3
Steric #: 5
Coord. #:5
Steric #: 6
Coord. #:5
SOME (MORE) DEFINITIONS
• ELECTRON GEOMETRY: GEOMETRY INCLUDING IF YOU “SAW” ELECTRON PAIRS
• MOLECULAR GEOMETRY: GEOMETRY WHERE YOU DON’T “SEE” ELECTRON PAIRS
• BOND ANGLE: ANGLE BETWEEN BONDS.
EG:Tetrahedral
MG: Trig. pyramidal
EG:Trig. bipyramidal
MG: Trig. bipyramidal
EG:Octahedral
MG: Square Pyramidal
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LearningCatalytics: session ID: NONE TODAY.
Visit: https://checkin.ics.uci.edu/ : vsepr
Ensure when asked if you will share your location you select “allow”.
LearningCatalytics: session ID: NONE TODAY.
PULL OUT YOUR
WORKSHEET, CANDY AND
TOOTHPICKS!
Thanks to http://www.chemmybear.com/shapes.html for all animations on following slides!
STERIC NUMBER 2
Linear
Linear
180°
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STERIC NUMBER 3
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Trigonal Planar
Trigonal Planar
Trigonal Planar
Bent
120°
<120°
Examples:
SO3, BF3, CO32-
Examples:
SO2, CCl2
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STERIC NUMBER 4
Tetrahedral
Tetrahedral
Tetrahedral
Trigonal Pyramidal
109.5°
Examples:
CH4, SiH4, PO4
<109.5°
Examples:
NH3, PI3
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Tetrahedral
Bent
<109.5° and <AX3E
Examples:
H2O, OF2
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STERIC NUMBER 5
Trig. Bipyramidal
Trig. Bipyramidal
90°, 120°
Examples:
PCl5, SbF5
Trig. Bipyramidal
See-saw
<90°, <120°
Examples:
TeCl4, SF4
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Trig. Bipyramidal
Trig. Bipyramidal
T-shaped
linear
<90°
180°
Examples:
ClF3, SeO32-
Examples:
I3-, XeF2
STERIC NUMBER 6
Octahedral
Octahedral
90°
Examples:
SF6, Mo(CO)6
Octahedral
Square Pyramidal
<90°
Examples:
IF5, BrF5
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Octahedral
Square planar
90°
Examples:
XeF4, ClF4-