Chemical Bonding and Molecular Geometry

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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 identi ... fying 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. [Show More]

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