ELEMENTS/COMPOUNDS METALS/NONMETALS/METALLOIDS Chemical/Physical Changes
Chemical Bonds: The Formation of Compounds From Atoms · PDF file3 Chemical Properties of...
Transcript of Chemical Bonds: The Formation of Compounds From Atoms · PDF file3 Chemical Properties of...
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Chemical Bonds:
The Formation of
Compounds From AtomsChapter 11
Hein and Arena
Eugene Passer
Chemistry Department
Bronx Community College
© John Wiley and Sons, Inc.
Version 1.1
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Metals and Nonmetals Reviewed
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Chemical Properties
of Metals
• metals tend to lose
electrons and form
positive ions called
cations.
• nonmetals tend to
gain electrons and
form negative ions
called anions.
Chemical Properties
of Nonmetals
When metals react with nonmetals, electrons
are usually transferred from the metal to the
nonmetal; each obtains a FULL OCTET.
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Metalloids have properties that
are intermediate between metals
and nonmetals
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Metals are found to the left of the metalloidsNonmetals are found to the right of the metalloids.
11.1
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Periodic Trends in
Atomic Properties
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Atomic Radius
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Atomic radii
increase down a
group.
11.2
n = 1
n = 2
n = 3
n = 4
n = 5
n = 6
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Radii of atoms tend to decrease
from left to right across a period.
For
representative
elements within
the same period,
n remains
constant as
electrons are
added.
This increase in
positive nuclear
charge pulls all
electrons closer
to the nucleus.
11.2
Each time an
electron is
added, a proton
is also added to
the nucleus.
n=1
n=2
n=3
n=4
n=5
n=6
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Ionization Energy
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The ionization energy of an atom is the
energy required to remove an electron from
an atom.
Na + ionization energy → Na+ + e-
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Periodic relationship of the first ionization energy for
representative elements in the first four periods.11.3
Ionization energies of Group A elements decrease
from top to bottom in a group.
IA
IIA IIIA
IVA
VAVIA
VIIA
Noble
Gases
ns2np3
ns2np6
ns2
ns2np1
ns2np4ns1
ns2np2
ns2np5
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As each succeeding electron is removed from
an atom ever higher energies are required.
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Lewis Structures
of Atoms
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The Lewis structure of an atom uses dots to
show the valence electrons of atoms.
The number of dots equals the number of s
and p electrons in the atom’s valence shells.
BPaired
electrons
Unpaired
electron
Symbol of
the element
2s22p1
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11.4
Lewis Structures of the first 20 elements.
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The Ionic Bond: Transfer of
Electrons From One Atom
to Another
(Metal – Nonmetal)
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An ionic bond results from the complete
transfer of an electron(s) from the metal
atom to the nonmetal atom involved in a
bond.
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The Formation ofSodium Chloride
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The 3s electron of sodium transfers to the 3p orbital of
chlorine.
Lewis representation of sodium chloride formation.
A sodium ion (Na+) and a chloride ion (Cl-) are formed.
The force holding Na+ and Cl- together is an ionic bond.
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Relative Size ofSodium Ion to Chloride Ion
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The sodium ion is smaller than the sodium atom
because it lost an electron.
Na [Ne] 3s1 Na+ [Ne]
The chloride ion is larger that the chlorine atom
because it gained an electron.
Cl [Ne] 3s2 3p5 Cl- [Ar]
11.6
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Predicting Formulas of
Ionic Compounds
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Because of similar electronic configurations,
the elements of a group, or family, generally
form ionic compounds with the same atomic
ratios.
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The Covalent Bond:
Sharing Electrons
(Nonmetal – Nonmetal)
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A covalent bond results when the
bonding electron pair is shared between
the two nonmetal atoms involved in a
bond.
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Covalent bonding in the hydrogen molecule
involving s atomic orbitals
11.8
:. .
+
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11.9
Covalent bonding in the chlorine molecule
involving p atomic orbitals
:. .
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hydrogen chlorine iodine nitrogen
Covalent bonding with equal sharing of
electrons occurs in diatomic molecules
formed from one element.
A dash may replace a pair of dots.
N N
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Electronegativity and Bond
Polarity
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Electronegativity is the relative ability of a
covalently bonded atom to attract the
bonding pair of electrons to itself.
The greater the electronegativity of the atom,
the greater the attraction it has for the
bonding electrons.
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• If the two atoms that constitute a
covalent bond are identical then there
is equal sharing of electrons.
• This is called nonpolar covalent
bonding.
• Ionic bonding and nonpolar covalent
bonding represent two extremes.
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• If the two atoms that constitute a
covalent bond are not identical then
there is unequal sharing of electrons.
• This is called polar covalent bonding.
• One atom assumes a partial positive
charge and the other atom assumes a
partial negative charge.
– This charge difference is a result of the
unequal attractions of shared electron
pair.
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:H Cl
+ -
Shared electron pair.
:
The shared electron pair
is closer to chlorine than
to hydrogen.
Partial positive charge
on hydrogen.
Partial negative charge
on chlorine.
Chlorine has a greater attraction for the
shared electron pair than hydrogen.
Polar Covalent Bonding in HCl
The chlorine atom is more electronegative than
hydrogen.
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Electronegativity decreases down a group for
representative elements.
Electronegativity generally increases left to right
across a period.
1
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The polarity of a bond is determined by the
difference in electronegativity values of the
atoms forming the bond.
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A electronegativity difference > 1.6-1.9,
the bond will be more ionic than
covalent.
A electronegativity difference > 2, the
bond is strongly ionic.
A electronegativity difference < 1.5, the
bond is strongly covalent.
General Guideline to Bond Polarity
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H H
Hydrogen Molecule
If the electronegativities are the same, the bond
is nonpolar covalent and the electrons are shared
equally.The molecule is
nonpolar covalent.
Electronegativity
2.1
Electronegativity
2.1
11.10
Electronegativity
Difference = 0.0
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If the electronegativities are not the same, the
bond is polar covalent and the electrons are
shared unequally.
H Cl
Hydrogen Chloride Molecule
Electronegativity
2.1
Electronegativity
3.0
The molecule is
polar covalent.
+ -
Electronegativity
Difference = 0.9
11.10
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42Sodium Chloride
Na+ Cl-
If the electronegativities are very different, the
bond is ionic and the electrons are transferred to
the more electronegative atom.
Electronegativity
0.9
Electronegativity
3.0
The bond is ionic.No molecule exists.
Electronegativity
Difference = 2.1
11.10
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An arrow can be used to indicate a dipole.
The arrow points to the negative end of the
dipole.
H Cl H Br H
O
H
Molecules of HCl, HBr and H2O are polar .
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A molecule containing different kinds of
atoms may or may not be polar depending
on its shape.
The carbon dioxide molecule is nonpolar
because its carbon-oxygen dipoles cancel
each other by acting in opposite directions.
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Lewis Structures of
Compounds
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Step 1. Count the total number of valence
electrons in the molecule.
Step 2. Draw a symmetric skeletal structure
of the molecule with the most
electropositive element as central
atom.
Step 3. Give a full octet to each atom in
skeletal structure (except H and B).
Writing Lewis Structures: Step by Step.
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Step 4. If the electron count in Step 1 and
Step 3 are equal; you have drawn the
correct structure (e.g. CH4).
Step 5. If the electron count in Step 1 is less
than Step 3, use multiple bonds (e.g.
CO2).
Step 6. If the electron count in Step 1 is
greater than Step 3, add additional
electron pair(s) to the central atom
(e.g. ICl3).
Writing Lewis Structures, Cont.
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Rule 1. Carbon is usually the central atom,
It can bond to itself. It can form
4-bonds, 2 double bonds or a triple
bond.(e.g. O=C=O and C=O).
Rule 2. Oxygen does not bond to itself,
except in peroxide, and forms 2-
bonds or a double bond
(e.g. CH3-O-H).
Rule 3 Hydrogen forms only 1-bond.
Writing Lewis Structures, Cont.
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Write a Lewis structure for CO2.
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Write a Lewis structure for ICl3.
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Write a Lewis structure for NO3-.
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Molecular Shape
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11.12
105° 180° 120° 109.5°
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The Valence Shell
Electron Pair Repulsion
(VSEPR) Model
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The VSEPR model is based on the idea
that electron pairs will repel each other
electrically and will seek to minimize
this repulsion.
VSEPR: the electron pairs are arranged as
far apart as possible around a central
atom.
Non-bonding electron pairs are more
delocalized than bonding electron pairs.
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Its electrons are arranged 180o apart for
maximum separation.
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• Its electrons are arranged 120o apart for
maximum separation.
Trigonal planer geometry
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• However, since the molecule is 3-dimensional
the molecular structure is tetrahedral with a
bond angle of 109.5o.
Tetrahedral geometry
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Ball and stick models of methane, CH4, and carbon
tetrachloride, CCl4.11.13
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The NH3 molecule
is pyramidal.
NH3 has one
unbonded pair
of electrons.
~109°
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The H2O molecule
is bent.
H2O has two
unbonded pair
of electrons.
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