Transcript 8_3 Names and Formulas for Ionic Compoundsx

Names and Formulas for Ionic Compounds
Do Now:
Article: 222, 226
Mastering Concepts: 236(54-56)
Terms: 221
Practice Problems: 224(19-23) 225(24-28)226(29-33)
Homework:
Cornell Notes: 8.3
Section Assessment: 227(34-38) 9 Stamps
Section 8.3 Names and Formulas for
Ionic Compounds
Section 8-3
• Relate a formula unit of an ionic compound to its
composition.
• Write formulas for ionic compounds and oxyanions.
• Apply naming conventions to ionic compounds and
oxyanions.
nonmetal: an element that is generally a gas or a dull,
brittle solid and is a poor conductor of heat and electricity
Section 8.3 Names and Formulas for
Ionic Compounds (cont.)
Section 8-3
formula unit
monatomic ion
oxidation number
polyatomic ion
oxyanion
In written names and formulas for ionic
compounds, the cation appears first,
followed by the anion.
Formulas for Ionic Compounds
Section 8-3
• When writing names and formulas for ionic
compounds, the cation appears first followed by
the anion.
• Chemists around the world need to
communicate with one another, so a
standardized system of naming compounds was
developed.
Formulas for Ionic Compounds (cont.)
Section 8-3
• A formula unit represents the simplest ratio of
the ions involved.
• Monatomic ions are one-atom ions.
Formulas for Ionic Compounds (cont.)
Section 8-3
• Oxidation number, or oxidation state, is the
charge of a monatomic ion.
Formulas for Ionic Compounds (cont.)
Section 8-3
• The symbol for the cation is always written first,
followed by the symbol of the anion.
• Subscripts represent the number of ions of each
element in an ionic compound.
• The total charge must equal zero in an ionic
compound.
Formulas for Ionic Compounds (cont.)
• Polyatomic ions are ions made up
of more than one atom.
• Never change subscripts of
polyatomic ions, place in
parentheses and write the
appropriate subscript outside the
parentheses.
Section 8-3
Formulas for Ionic Compounds (cont.)
Section 8-3
Names for Ions and Ionic Compounds
Section 8-3
• An oxyanion is a polyatomic ion composed of an
element (usually a non-metal), bonded to one or
more oxygen atoms.
Names for Ions and Ionic Compounds (cont.)
Section 8-3
Names for Ions and Ionic Compounds (cont.)
Section 8-3
• Chemical nomenclature is a systematic way
of naming compounds.
– Name the cation followed by the anion.
– For monatomic, cations use the element name.
– For monatomic anions, use the root element
name and the suffix –ide.
– To distinguish between different oxidation
states of the same element, the oxidation
state is written in parentheses after the name
of the cation.
– When the compound contains a polyatomic
ion, name the cation followed by the name of
the polyatomic ion.
Names for Ions and Ionic Compounds (cont.)
Section 8-3
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
19. Potassium and iodide
20. Magnesium and chloride
21. Aluminum and bromide
22. Cesium and nitride
23. Barium and sulfide
15
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
19. Potassium and iodide
+
K
KI
I
16
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
20. Magnesium and chloride
+2
Mg
Cl
MgCl2
17
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
21. Aluminum and bromide
+3
Al
Br
AlBr3
18
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
22. Cesium and nitride
+1
Cs
-3
N
Cs3N
19
Practice Problems: 224 (19-23)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
23. Barium and sulfide
+2
Ba
-2
S
Ba2S2
BaS
Simplest formula
20
Formulas for Ionic Compounds (cont.)
Copy
Section 8-3
p.224
Practice Problems: 225 (24-28)
Determine the correct formula for the ionic
compound composed of the following pairs of
ions.
24. Sodium and nitrate
25. Calcium and chlorate
26. Aluminum and carbonate
27. Potassium and chromate
28.Magnesium and carbonate
22
Practice Problems: 225 (24-28)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
24. Sodium and nitrate
+
Na
NO3
-
NaNO3
23
Practice Problems: 225 (24-28)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
25. Calcium and chlorate
+2
Ca
ClO3
-
Ca(ClO3)2
24
Practice Problems: 225 (24-28)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
26. Aluminum and carbonate
+3
Al
CO3
-2
Al2(CO3)3
25
Practice Problems: 225 (24-28)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
27. Potassium and chromate
+
K
CrO4
-2
K2CrO4
26
Practice Problems: 225 (24-28)
Write the correct formula for the ionic compound
composed of the following pairs of ions.
28.Magnesium and carbonate
+2
Mg
-2
CO3
Mg2(CO3)2 Simplest formula
MgCO3
27
Anion
Cation
Lose electrons  +
Gain electrons  -
Has fewer electrons
Has more electrons
Metal
Formation of Ionic Bond
Naming of Ionic Bond
Non
Metal
Practice Problems: 226 (29-33)
Name the following compounds.
29. NaBr
30. CaCl2
31. KOH
32. Cu(NO3)2
33. Ag2CrO4
29
Metal
Non
Metal
Naming of Ionic Bond
Cation
Anion
-ide
29. NaBr
Sodium Brom -ide
ine
Sodium Bromide
Metal
Non
Metal
Naming of Ionic Bond
Cation
Anion
-ide
30. CaCl2
Calcium Chlor -ide
ine
Calcium Chloride
Naming of Ionic Bond
Cation
Polyatomic ion
31. KOH
Potassium Hydroxide
Potassium Hydroxide
Naming of Ionic Bond
Cation
Polyatomic ion
32. Cu(NO3)2
Transition Metal requires
roman numerals
Copper II Nitrate
Copper II Nitrate
Naming of Ionic Bond
Cation
Polyatomic ion
33. Ag2CrO4
Silver
Chromate
Silver Chromate