section 7.3 names and formulas for ionic compounds
TRANSCRIPT
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Section 7.3
Names and Formulas
For
Ionic Compounds
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Naming Compounds
Name of a student _________ _________ first last
Name of an ionic compound sodium chloride
Which substance lost electrons?Which substance gained electrons?
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Formula Unit
Chemical compound of an ionic compound
Simplest ration of the ions involved
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Magnesium Chloride
Magnesium group 2 Mg2+
Chlorine group 17 Cl-
Want net charge of zero:
Have 2+ and 1-
Want 2+ and 2- so need 2 Cl-
Ratio 1:2 MgCl2
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Ratios
Determine the ratio from the formula units
Ag2S
MgCl2
Al2O3
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On Your Own
Determine the ratio
SnF4
FeO
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Monatomic Ions
One-atom ion
Mg2+
Br-
Use the periodic table.
What is the formula for beryllium ion?
Iodide ion?
Nitride ion?
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Common Monatomic Ions
Group Atoms Charge on Ions
1 H, Li, Na, K, Rb, Cs
1+
2 Be, Mg, Ca, Sr, Ba
2+
15 N, P, As 3-
16 O, S, Se, Te 2-
17 F, Cl, Br, I 1-
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Monatomic Metal Ions
Group Common Ions
3 Sc3+, Y3+, La3+
4 Ti2+, Ti3+
5 V2+, V3+
6 Cr2+, Cr3+
7 Mn2+, Mn3+, Tc2+
8 Fe2+, Fe3+
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Continued
Group Common Ions
9 Co2+, Co 3+
10 Ni2+, Pd2+, Pt2+, Pt 4+
11 Cu+, Cu2+, Ag+, Au+, Au 3+
12 Zn2+, Cd2+, Hg2+
13 Al 3+, Ga2+, Ga 3+, In+,In2+, In 3+, Tl+, Tl 3+
14 Sn2+, Sn 4+, Pb2+, Pb 4+
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Oxidation Numbers
The charge on a monatomic ionOxidation number or oxidation state
Equals the number of electrons transferred from the atom to form the ion
Notice some ions have more than one oxidation state – with the d orbital elements
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Binary Ionic Compounds
Symbol Cation then Anion
Subscripts equals number of ions
if no subscript then it is 1
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How to figure the Formula
Write the symbol and charge for each ion
Find the ratio of ions in the formula
• Overall charge must be zero
• Subscripts times the charges sum to zero
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Example 7.1
Determine the formula for the ionic compound formed from potassium and oxygen.
Potassium group 1 K+
Oxygen group 16 O2-
Ratio: 2:1
K2OEvaluate: 2 K ions (+1) + 1 O ion (-2)
= 2 (+1) + 1(-2) = 2 + (-2) = 0
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Example 7.2
Determine the formula for the compound formed from aluminum ions and sulfide ions.
Aluminum group 13 Al3+
Sulfur group 16 S2-
Ratio: 2:3
Al2S3
Evaluate: 2 Al ions (3) + 3 S ions (-2)
= 2 (3) + 3 (-2) = 6 + (-6) = 0
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Practice Write the ionic compound formula.19.Potassium and
iodide
20.Magnesium and chloride
21.Aluminum and bromide
22.Cesium and nitride
19. KI
20. MgCl2
21. AlBr2
22. Cs3N
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Polyatomic Ionic Compounds
Ionic compounds made from more than one atom.
Popular ions
Ammonium NH4+
Nitrite NO2-
Nitrate NO3-
Hydroxide OH-
Cyanide CN-
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Formulas for Polyatomic Ionic Compounds
Mg(NO3)2 Mg2+ + (NO3)- ratio 1:2
Al(NO3)3 Al3+ + (NO3)- ratio 1:3
Use parenthesis to surround the polyatomic ion
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Practice
Write the formula for ionic compounds.
24. Sodium and nitrate
25. Calcium and chlorate
26. Aluminum and carbonate
24. Ratio 1:1
Na+ + (NO3)- Na(NO3)
25. Ratio 1:2
Ca2+ + (ClO3)- Ca(ClO3)2
26. Ratio 2:3
Al3++(CO3)2- Al2(CO3)3
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Naming Ionic Compounds
1. Name the cation followed by the anion
2. For monatomic cations use the element name
3. For monatomic anions change the suffix to –ide.
CsBr Cesium Bromide
Rule 1
Rule 2Rule 3
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4. To distinguish between multiple oxidation numbers of the same element use (roman numerals) after the symbol.
Fe2+ + O2- FeO Iron (II) Oxide
Fe3+ + O2- Fe2O3 Iron (III) Oxide
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5. When the compound contains a polyatomic ions use the polyatomic ion name.
NaOH is sodium hydroxide (OH)-
(NH4)2S is ammonium sulfide (NH4)+
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Naming Ionic Compounds
Determine the cation and anion
of the given formula
Does the cation haveonly one oxidation
number?
Write the name ofthe cation, then thename of the anion
Wite the name of thethe cation followed
by a Roman numeral to represent the charge, then
write the anion name.
Yes No
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Practice Problems
Name the following compounds.
28.NaBr
29.CaCl230.KOH
31.Cu(NO3)2
32.Ag2CrO4
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Each Student
Make a 5 x 5 chart
Across the top write 5 non-metal ions, with one polyatomic anion
Along the side list 5 metals, with ammonium ion.
Trade charts with another student, name each compound in the boxes.
Trade back and check.
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Summary
A formula unit gives the ratio of cations to anions in the ionic compound.
A monatomic ion is formed from one atom. The charge of amonatomic ion is its oxidation number.
Roman numerals indicate the oxidation number of cations having multiple possible oxidation states.
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Polyatomic ions consist of more then one atom and act as a single unit.
To indicate more than one polyatomic ion in a chemical formula, place parentheses around the polyatomic ion and use a subscript.
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Practice Problems
34.State the order in which the ions associated with a compound composed of potassium and bromine would be written in the chemical formula and the compound name.
35.Describe the difference between a monatomic ion and a polyatomic ion, and give an example of each.
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36. Ion X has a charge of 2+ and ion Y has a charge of 1-. Write the formula unit of the compound formed from the ions.
37.State the name and formula for the compound formed from Mg and Cl.
38.Write the name and formula for the compound formed from sodium ions and nitrite ions.
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Exit Ticket
This is the formula for making artificial ocean water often used in saltwater aquariums. Mix 24.72g NaCl, 0.67g KCl, 1.36g CaCl, 4.66g MgCl2, 6.29g MgSO4 and 0.18g NaHCO3.
Name each ionic compound.