In order to describe the covelent bonds and the reasonsvalence bond method is better than the Lewis structures are to be explained. Concept introduction: The chemical bonding between two atoms is the result of an overlap of half-filled atomic orbitals and is termed as valence bond theory . The hybrid orbital is formed when the atoms share the unpaired electron to form a filled orbital.
In order to describe the covelent bonds and the reasonsvalence bond method is better than the Lewis structures are to be explained. Concept introduction: The chemical bonding between two atoms is the result of an overlap of half-filled atomic orbitals and is termed as valence bond theory . The hybrid orbital is formed when the atoms share the unpaired electron to form a filled orbital.
Definition Definition Theory that explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. VBT gives a quantum mechanical approach to the formation of covalent bonds with the help of wave functions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
Chapter 11, Problem 1E
Interpretation Introduction
Interpretation:
In order to describe the covelent bonds and the reasonsvalence bond method is better than the Lewis structures are to be explained.
Concept introduction:
The chemical bonding between two atoms is the result of an overlap of half-filled atomic orbitals and is termed as valence bond theory. The hybrid orbital is formed when the atoms share the unpaired electron to form a filled orbital.
Expert Solution & Answer
Answer to Problem 1E
The valence bond theory is better thanthe Lewis theory on facts relating to sigma and pi bonds, the shape of molecules, rotation about double bonds and about odd electron species.
Explanation of Solution
Lewis theory and valence bond theoryexplainabout covalent bonding. But the main difference is that Lewis theory involves only valence electrons and the valence bond theory involves overlapping of orbitals having electrons.
Lewis theory considers covalent bonding to be sharing of electrons, unlike valence bond theory. Besides, Lewis theory does not involve hybridization or overlap of orbitals like valence bond theory where electrons pairin this process.
There are various ways by which thevalence bond theory is superior to Lewis structures while describing covalent bonds.
Some of them are explained as follows:
There is a distinguishing feature between sigma and pi bonds. For instance, double bond appears as two bonds in Lewis theory and there is no indication if the double bond is stronger than a single bond. But valence bond theory clarifies that sigma bond is stronger than the pi bond.
Valence bond theory gives geometry of the molecule as hybridization is involved while Lewis theory does not describe the geometry of the molecule.
Valence bond theory explainsthe rotation within a double bond involving a cleavage of sigma bond while Lewis theory does not explain double bond rotation.
Valence bond theory explains odd electron species.
Conclusion
Thus, the valence bond theory is superior to Lewis theory on facts relating to sigma and pi bonds, shape of molecules, rotation of double bonds and odd electron species.
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5
4. These four 'H NMR spectra were recorded from different isomers with molecular formula
CsH,CIO. They all contain a carbonyl group. Determine the structure of the different isomers.
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10
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9
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3.
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9
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10
66
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9
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1
8
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3
2
-a
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22
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1
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16
1
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2 1
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0
Use the expression below to
⚫ calculate its value and report it to the proper number of significant digits (you may need to
round your answer).
⚫ calculate the % error (or % relative error or % inherent error)
⚫ calculate the absolute error.
(20.54±0.02 × 0.254±0.003) / (3.21±0.05) =
Value:
% Error:
Absolute error: ± |
% (only 1 significant digit)
(only 1 significant digit)
In each case (more ductile, more brittle, more tough or resistant), indicate which parameter has a larger value.
parameter Elastic limit Tensile strength
more ductile
Strain at break Strength Elastic modulus
more fragile
more tough or resistant
Chapter 11 Solutions
General Chemistry: Principles and Modern Applications (11th Edition)
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