Lab - Investigating Three Dimensional Shapes PDF

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Lab: Investigating Three-Dimensional Shapes Chemists use VSEPR theory to predict the structure of molecules. A molecule’s structure can reveal important characteristics, such as its reactivity, behaviour, and electrical conductivity. Chemists also use molecular models to visualize the structure of a molecule. In this activity, you will use VSEPR theory to predict the structure of different molecules, and then use a molecular modelling program to visualize these molecules. Purpose: To test your understanding of VSEPR theory and observe three-dimensional structures of molecules. Procedure: 1. Draw Lewis diagrams and use VSEPR theory to predict the structures and bond angles of the following molecules: HBr, BCl2F, CH2O, CH4, O2, NH3, PF5, SCl6, H2S, BeCl2. 2. Go to https://phet.colorado.edu/sims/html/molecule-shapes/latest/moleculeshapes_en.html and select Model. Build digital models of your molecules. 3. For each molecule, take a screenshot or sketch the molecule and fill in the table below. The first molecule is done for you. Molecule

Lewis Diagram

HBr

AXE VSEPR classification Shape (central atom) AXE3 Linear

180 o

BCl2F

AX3

120 o

Trigonal planar

Bond Angles

Screenshot / Sketch of molecule

CH2O

AX3

Trigonal planar

120 o

CH4

AX4

Tetrahedral

109.5 o

O2

N/A

Linear

180 o

NH3

AX3E

Trigonal pyramidal

107 o

PF5

AX5

Trigonal 90 o, bipyramidal 120 o

SCl6

AX6

Octahedral

90 o

H 2S

AX2E2

Bent

104.5 o

BeCl2

AX2

Linear

180 o...