Transcript ionic bond

Chapter 7
Ionic Bonds
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Ionic Bonds Video
Chemical Bonds

force that holds two atoms together (either
by sharing or transferring electrons)
Ionic Bonds
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bond composed of charged particles
(formed by losing or gaining electrons) that
are electrostatically held together
Properties of Ionic Bonds
ions are held together in a crystal lattice (3D
geometric arrangement of particles)
 solids
 high melting and boiling points
 will conduct electricity when dissolved in
water
 Video- crystal lattice
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Ions
charged particle (from losing or gaining
electrons)
 Cation:positively charged particles formed
by losing electrons
 Anion:negatively charged particles formed
by gaining electrons
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What are cations afraid of?
Dogions. Ha.Ha.Ha.Ha.Ha.
Monoatomic Ion = ion made of one type of
atom
Ex. Na+
O-2
 Polyatomic Ion = ion made of more than
one type of atom
Ex. CO3-2
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Oxidation Number
the charge on the atoms or group of atoms
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Group 1 = +1
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Group 2 = +2
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Group 13 = +3
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Group 16 = -2
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Group 17 = -1
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Chemical Formula
Combination of symbols that represent the
composition of a compound
 (compound – chemical combination of two
or more elements)
 -shows relative number of atoms of each
element and types of elements involved.
 Subscript = # of atoms of that element
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Writing ionic formulas
1. Find the oxidation numbers of both ions
(chart or p. 218-221) and symbols
2. Add atoms so that the total charge adds up
to zero (may have to use least common
multiple)
3.
Combine symbols and subscripts together
, cation first then anion (use parentheses
around polyatomics and NO roman
numerals after lead, iron, copper and tin)
4.
Sodium and chlorine love story
Sodium oxide
Na
= +1
O
= -2
You need two +1 sodium ions to add up to the –2 charge
on the oxygen ion to make the compound add up to zero
Na +1
O-2
Na +1
Na2O
Iron (III) sulfate
SO4 = -2
Fe = +3
-Least common multiple = 6
-Need 2 iron ions, 3 sulfate ions
Fe +3
Fe
+3
SO4-2
SO4-2
SO4-2
Fe2(SO4)3
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Aluminum sulfide
Barium chloride
Lead (II) nitrate
Ammonium phospate
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Al2S3
BaCl2
Pb(NO3)2
(NH4)3PO4
Naming Ionic Compounds
1. Name the cation as it is written on the
periodic table (except ammonium)
2. Add roman numeral in parentheses if lead,
iron, copper or tin.
3. AnionMonoatomic –change ending to –ide
(Ex. Oxygen => oxide)
Polyatomic – keep ending as written.
(Ex. Carbonate)
4. Common acids don’t follow these rules.
MgI2
Magnesium iodide
SnCO3
Tin (II) carbonate