Lab 6.docx - July 6, 2017 Lab Experiment #2: Introduction...

July 6, 2017
Lab Experiment #2: Introduction to Molecules
Lab Partners: N/A
Introduction to Molecules

Purpose & Hypothesis
The purpose of this lab is to create molecules and to study how they bond. My hypothesis for this
lab is if I complete all the activities of drawing and creating structure, then I will better
understand their polarity and how molecules bond.
Pre-Lab Questions:
1 Most elements exist as components of compounds rather than in a free state. Explain why.
2 Use colored pencils to lightly shade each element in the Periodic Table of Electronegativity
Values.
Color 1 Color 2 Color 3 Color 4
0 – 0.9 1.0 – 1.9 2.0 – 2.9 3.0 – 4.0
Data
Data Table 1 (Make Copies of This Table)

Activity 1
Lewis Dot Structures
Activity 3
Molecular Geometry
Activity 4
Bonding and
Polarity
Chemical
Formula:
BeCl
2
Dot Diagrams:
Electrons: 16
Central Atom:
Be
Lewis Structure:
Cl Be Cl
Domains:
H
2
O
Lone Pairs:2
Geometry:Bent,
polar
Bond
Angle:109.5
Line Drawing:
O
H H
Electronegativity:
O
2
3.44
Bond Polarity:
Nonpolar
Dipole
Moment:No
Chemical
Formula:
BF
3
Dot Diagrams:
F B F
F
Electrons: 22
Central Atom:
B
Lewis Structure:
Domains:
CO
2
Lone Pairs:2
Geometry:
Linear
Bond Angle:180
Line Drawing:
O C O
Electronegativity:
HCN .5
Bond Polarity:
Polar
Dipole
Moment:Yes
Polarity:Polar
Chemical
Formula:
CH
4
Dot Diagrams:
H
H C H
H
Electrons: 8
Central Atom:
C
Lewis Structure:
Domains:
NH
3
Lone Pairs:3
Geometry:
Trigonal
Pyramidal
Bond Angle:
107
Line Drawing:
H N H
H
Electronegativity:
SnCl
2
1.2
Bond Polarity:
Polar
Dipole
Moment:Yes
Polarity: Polar
Activity 4: Bonding and Polarity

Data Table 2
Bonding Pair
Electronegativity
Difference
Type of Bond Bond Polarity
H and H 2.1-2.1=0 Nonpolar covalent Nonpolar
B and F 4-2=2 Ionic Ionic
Ge and F 4-1.8=2.2 Ionic Ionic
C and H 2.5-2.1=.4 Polar covalent Polar
N and H 3-2.1=.9 Polar covalent Polar
H and O 3.5-2.1=1.4