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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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Section
BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 5, Problem 25E
Textbook Problem
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What is wrong with each Lewis structure? Fix the problem and write a correct Lewis structure.

Chapter 5, Problem 25E, What is wrong with each Lewis structure? Fix the problem and write a correct Lewis structure.

Interpretation Introduction

Interpretation:

The reasons for the wrong Lewis structures are to be found. The error to be fixed and the correct Lewis structure for each of the given compounds are to be written.

Concept Introduction:

The steps for drawing the Lewis structures of the ionic compounds are as follows:

The Lewis structures of elements are combined to form the Lewis structures of compounds.

The dots are transferred from the Lewis structure of the metal to the Lewis structure of the non-metal.

The metal becomes a cation and the non-metal becomes an anion.

According to the Lewis theory, in covalent bonding, atoms share their electrons. The steps for drawing a covalent Lewis structure are as follows:

Write the skeletal structure of the molecule.

Add the number of valence electrons of each atom in the molecule in order to calculate the total number of electrons present in the molecule.

Place the electrons by dots to complete the octets of the atoms.

If the central atom has not obtained an octet, then its multiple bonds can be formed.

Explanation of Solution

a)

CaO is an ionic compound.

Calcium (Ca) and oxygen (O) have the following Lewis structures:

So, calcium loses its two valence electrons to obtain an octet, while oxygen needs two electrons to complete its octet.

Hence, the correct Lewis structure of CaO is as follows:

b) The given structure is as follows:

The given compound is a covalent compound. Hence, the electrons are shared between the atoms.

Oxygen is the central atom and chlorine atoms are arranged around it. Thus, the skeletal structure of the compound is:

Cl     O     Cl

Now, determine the total number of electrons for the molecule.

Total electrons = valence electrons for Cl + valence electrons for O= 2(7)+6= 20

These electrons are distributed in the structure to complete the octet of each atom. But, in a given molecule, chlorine has ten electrons.

So, the correct Lewis structure will be as follows:

As all the atoms in the structure have obtained an octet, the structure is complete.

c) The given structure is as follows:

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Chapter 5 Solutions

Chemistry In Focus
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