How does vsepr affect the shape of molecules

Lab 6 Molecular Geometry CHEM101L

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Pre-Lab Questions:

1. Describe the difference between valence and core electrons.

2. What is the octet rule and which elements obey the octet rule?

3. How does VSEPR affect the shape of molecules?

4. What effect does the presence of lone-pair electrons have on the bond angles in a molecule?

Experiment 1: Molecular Models of Neutral Molecules

Part 1: Periodic Table

Table 1: Lewis Dot Structures

Element

Symbol

Group Number

Valence Electrons

Lewis Dot Structure

Hydrogen

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Carbon

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Chlorine

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Aluminum

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Oxygen

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Fluorine

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Neon

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Nitrogen

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Table 1 Upload of Lewis Dot Structure Sketches with your name and access code handwritten in the background:

Part 2: Construction of Molecules

Table 2

Molecule (central atom is underlined)

Sketch of Lewis Dot Structure

Shape Name

Bond Angle

Structure

Bond Angle

CO2

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Linear

AlCl3

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Trigonal Planar

H2O

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Bent

NH3

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Trigonal pyramidal

CCl4

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Tetrahedral

PCl5

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Trigonal bipyramidal

SF6

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Octahedral

Table 2 Upload of Lewis Dot Structure Sketches and Molecular Models (Table 2a) with your name and access code handwritten in the background:

Table 2 Upload of Lewis Dot Structure Sketches and Molecular Models (Table 2b) with your name and access code handwritten in the background:

Post-Lab Questions:

1. Should all of the angles in methane (CH4) be equal? Why or why not?

2. What additional information does the VSEPR theory give you beyond electron dot structures, in terms of molecular structure?

3. Sketch the molecular shape of the following compounds. Be sure to label the bond angles. Upload the photo below.

Table 3

Compound

H2

Cl2

SO2

NH3

MoF6

Table 3 Upload of molecular shape sketches with your name and access code handwritten in the background:

.

.

N

H

H

H

C

C

l

C

l

C

l

C

l

P

C

l

C

l

C

l

C

l

C

l

S

F

F

F

F

F

F

C

O

O

A

l

C

l

C

l

C

l

O

H

H

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