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Covalent Bonding
Mike WangJerry WangJohn Chen
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What is Covalent Bonds ?
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Lewis Diagram
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Non-polar or polar ?
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Non-polar
Difference of electronegativity ( 0~0.5 )
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PolarDifference of electronegativity ( 0.5~1.7 )
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Bond lengthBond length or bond distance is the average distance between nuclei of two bonded atoms in a molecule. It is a transferable property of a bond between atoms of fixed types, relatively independent of the rest of the molecule.
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Bond energyThe bond energy is a measure of the amount of energy needed to break apart one mole of covalently bonded gases.
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Questions
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1. Construct Lewis Diagram
a. CH3Clb. PH3
c. SiF4
d. PO43-
e. ClO4-
f. CO32-
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Solutions:
a.
b.
c.
d.
e.
f.
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2. Calculate the Formal Charge
a. CH3Clb. PH3
c. SiF4
d. PO43-
e. ClO4-
f. CO32-
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Solutions:
a. All zerob. All zeroc. All zerod. P = +1e. Cl = +3f. C = 0
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3. Which bond Is More Polar?
a. C-N or C-Ob. H-Cl or H-Brc. S-O or S-Brd. H-S or H-Oe. P-Br or S-Br
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Solutions:
a. C-Ob. H-Clc. S-Od. H-Oe. P-Br
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Challenging Question
How to determine the relationship between type of bonds and the bond strength?
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EXPLANATION OF MISCONCEPTIONS
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When two electrons are sharing between two atoms to form a covalent bond, it is called a single bond.
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For example, one Cl2 molecule has one single bond. An O2 molecule has one double bond of 4 shared electrons.
A single bond is represented by a single dash between atoms.
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COMMON BONDS
Cl-Cl O=O N≡NF-F O=C=O
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Normally, we think that if two atoms has an electronegativity higher than 1.7 than they would form a ionic bond and it they have a different electronegativity less than 1.7, then they will form a covalent bond.
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● Not all molecules that have covalent bonds are nonpolar. ● Not all chemical bonds between a metal and a nonmetal are
ionic bonds. For example, (AlCl3) has covalent bonds.