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Writing formulas for multivalent ionic compounds. Transition metals have the ability to form more than one cation Therefore, a roman numeral is placed in the name to signify the charge on the cation Example: Iron (III) Chloride Write the formula?. - PowerPoint PPT Presentation
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Writing formulas for multivalent ionic compoundsWriting formulas for multivalent ionic compounds
• Transition metals have the ability to form more than one cation
• Therefore, a roman numeral is placed in the name to signify the charge on the cation
• Example:– Iron (III) Chloride
• Write the formula?
• Transition metals have the ability to form more than one cation
• Therefore, a roman numeral is placed in the name to signify the charge on the cation
• Example:– Iron (III) Chloride
• Write the formula?
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Writing formulas for mulitvalent ionic compoundsWriting formulas for mulitvalent ionic compounds
• Write formulas for the following:• Copper (I) Oxide• Copper (II) Oxide
Answers - Cu2O CuO
• Write formulas for the following:• Copper (I) Oxide• Copper (II) Oxide
Answers - Cu2O CuO
Naming compounds with multivalent metalsNaming compounds with multivalent metals
• If the metal is in group B it requires a roman numeral in the name.
• You will have to deduce the roman numeral based on the formula.
• Example– Name CoI2
• Answer - Cobalt (II) Iodide
• If the metal is in group B it requires a roman numeral in the name.
• You will have to deduce the roman numeral based on the formula.
• Example– Name CoI2
• Answer - Cobalt (II) Iodide
Naming compounds with multivalent metalsNaming compounds with multivalent metals
• Deducing the roman numeral• Multiply the charge on the anion by the
number of anions and then divide by the number of cations to get the roman numeral.
• Write the names for Fe2S3 SnO2
• Answers - – Iron (III) Sulfide Tin (IV) Oxide
• Deducing the roman numeral• Multiply the charge on the anion by the
number of anions and then divide by the number of cations to get the roman numeral.
• Write the names for Fe2S3 SnO2
• Answers - – Iron (III) Sulfide Tin (IV) Oxide
• Take ten minutes and work on sections 5 and 6 on the back side of your worksheet.
• Take ten minutes and work on sections 5 and 6 on the back side of your worksheet.
Polyatomic IonsPolyatomic Ions• A group of atoms that carry a charge• Examples:
– SO42- NO3
1-
• Names of polyatomic ions that contain oxygen will end in -ate or -ite
• -ite is one less oxygen then ate• Example
– Sulfate is SO42- Sulfite is SO3
2-
– Chlorate is ClO31- Chlorite is ClO2
1-
• Other polyatomic ions– NH4
1+ Ammonium CN1- cyanide– OH1- Hydroxide
• A group of atoms that carry a charge• Examples:
– SO42- NO3
1-
• Names of polyatomic ions that contain oxygen will end in -ate or -ite
• -ite is one less oxygen then ate• Example
– Sulfate is SO42- Sulfite is SO3
2-
– Chlorate is ClO31- Chlorite is ClO2
1-
• Other polyatomic ions– NH4
1+ Ammonium CN1- cyanide– OH1- Hydroxide
Writing formulas using polyatomic ionsWriting formulas using polyatomic ions
• The polyatomic ion is treated as one unit.
• Balance the charges• Place parenthesis around the
polyatomic ion if there is more than one• Example
– Write the formula for Iron (II) Nitrate
• Fe2+ and NO31- combines to make
Fe(NO3)2
• The polyatomic ion is treated as one unit.
• Balance the charges• Place parenthesis around the
polyatomic ion if there is more than one• Example
– Write the formula for Iron (II) Nitrate
• Fe2+ and NO31- combines to make
Fe(NO3)2
Naming using Polyatomic ionsNaming using Polyatomic ions
• Name the metal than name the polyatomic ion. If you need a roman numeral; include it.
• Treat the polyatomic ion as one unit (as if it were one atom)
• Example - Name CuSO4
• Copper (II) Sulfate
• Name the metal than name the polyatomic ion. If you need a roman numeral; include it.
• Treat the polyatomic ion as one unit (as if it were one atom)
• Example - Name CuSO4
• Copper (II) Sulfate
Exceptions for roman numeralsExceptions for roman numerals
• Silver, Cadmium and Zinc do not get roman numerals.
• Ag is always +1, Cadmium and Zinc are always +2
• Tin and Lead need roman numerals. They are multivalent (multiple oxidation states)
• Silver, Cadmium and Zinc do not get roman numerals.
• Ag is always +1, Cadmium and Zinc are always +2
• Tin and Lead need roman numerals. They are multivalent (multiple oxidation states)
Naming AcidsNaming Acids
• Memorize• HCl - Hydrochloric Acid• H2SO4 - Sulfuric Acid• HNO3- Nitric Acid• H3PO4 - Phosphoric Acid• Note - Acids give off H1+ (Hydrogen ions)
and bases give off OH1- ions• What do you get when an acid and base
combine?
• Memorize• HCl - Hydrochloric Acid• H2SO4 - Sulfuric Acid• HNO3- Nitric Acid• H3PO4 - Phosphoric Acid• Note - Acids give off H1+ (Hydrogen ions)
and bases give off OH1- ions• What do you get when an acid and base
combine?
Name the cation firstthen name the anion
Example: Lithium FuorideMagnesium Carbonate
No
Name the cation firstPlace a roman numeral
Name the anionExample: Iron (II) Sulfate
Yes
Does the compound contain amultivalent ion?
aka - transition metal orgroup B element
Ionic
Yes
Use prefixes to representthe number of atoms.
Example: H2O Dihydrogen MonoxideCO2 Cabon Dioxide
Molecular
No
Is there a metal?
Naming Compounds
Name the cation firstthen name the anion
Example: Lithium FuorideMagnesium Carbonate
No
Name the cation firstPlace a roman numeral
Name the anionExample: Iron (II) Sulfate
Yes
Does the compound contain amultivalent ion?
aka - transition metal orgroup B element
Ionic
Yes
Use prefixes to representthe number of atoms.
Example: H2O Dihydrogen MonoxideCO2 Cabon Dioxide
Molecular
No
Is there a metal?
Naming Compounds
Check for understandingCheck for understanding
• Name or write the formula for:– Potassium Sulfate– Chromium (III) Cyanide
– Fe(ClO3)3
– CuCl
• Answers– K2SO4 Cr(CN)3
– Iron (III) Chlorate– Copper (I) Chloride
• Name or write the formula for:– Potassium Sulfate– Chromium (III) Cyanide
– Fe(ClO3)3
– CuCl
• Answers– K2SO4 Cr(CN)3
– Iron (III) Chlorate– Copper (I) Chloride
• Now finish your worksheet and work on your homework.
• Get help• Make sure and check your answers on-
line. You will be writing formulas all year and doing math based on these formulas. You get the formula wrong you get the math wrong.
• Now finish your worksheet and work on your homework.
• Get help• Make sure and check your answers on-
line. You will be writing formulas all year and doing math based on these formulas. You get the formula wrong you get the math wrong.