Purpose:
The purpose of this lab is to understand the Lewis Dot Structure as well as the
VSEPR model, then apply them to multiple molecules. In this lab, we also work on our
understanding of identifying valence electr
...
Purpose:
The purpose of this lab is to understand the Lewis Dot Structure as well as the
VSEPR model, then apply them to multiple molecules. In this lab, we also work on our
understanding of identifying valence electrons and the molecular geometry. Through
this lab, we gain an understanding of these concepts and apply our knowledge to
understand the topic.
Experimental Narrative:
The Lab kit was used for this lab. First, the lab manual was read to understand the
procedure and materials needed. The needed materials from the lab kit were gathered
and organized. The implementation of a lab coat, safety glasses, and other safety
equipment were not used. First, the valence electrons of each molecule were
calculated. The Lewis dot structures were drawn following the calculations of the
valence electrons. The Lewis Structure bag from the lab kit was then used to
reconstruct the VSEPR models of each of the molecules. This completed table 1 data.
Following this, the number of atoms and lone pairs of electrons on the central Adam
were noted and written within data table 2. The molecular geometry was then
determined. This completed both tables and the procedure of the lab.
Chemical Bonding and Molecular Geometry
Hands-On Labs, Inc.
Version 42-0080-00-02
Exercise 1: Lewis Structures and Molecular
Modeling
Practice questions from Part 1: Practice Describing Molecular Structures (Answers Provided)
Number of Valence Electrons:
1. How many valence electrons does CHO2- have? Use the periodic table to calculate the total.Answer: 18 electrons. Carbon is in group IVA of the periodic table; hydrogen is in group IA;
oxygen is in group VIA. The negative charge indicates the presence of an additional electron.
Thus, C + H + O2 + e- = 4 + 1 + (2)6 + 1 = 18 The total number of valence electrons in CHO2 - is
18.
Lewis Structures:
1. What is the Lewis structure for CHO2- ?
Hint: CHO2- has resonance structures, and there are two forms of the drawn ion. Draw both
structures.
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