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Naming & Formulas: Multivalent & Polyatomic Ions

Naming & Formulas: Multivalent & Polyatomic Ions. Multivalent Metals. Multi = multiple Valent = charge Metal = specifically transition metals List all of the possible valencies for the following metals:. Naming Multivalent Metals. Rule:

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Naming & Formulas: Multivalent & Polyatomic Ions

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  1. Naming & Formulas:Multivalent & Polyatomic Ions

  2. Multivalent Metals • Multi = multiple • Valent = charge • Metal = specifically transition metals • List all of the possible valencies for the following metals:

  3. Naming Multivalent Metals Rule: • Indicate the charge in the name by a roman numeral • Metals are always a positive charge

  4. Naming Multivalent Metals • Example 1: CuO • Identify the positive ion and the negative ion Cu2+ – positive ion (how do we know that it has a charge of 2+?) O2-– negative ion • What is the name of the positive ion? Cu2+ - copper (II) • What is the name of the negative ion? – change the ending to “ide” O2- - oxide CuO = copper (II) oxide

  5. Naming Multivalent Metals • Example 2: Cu2O • Identify the positive ion and the negative ion Cu+– positive ion (how do we know that it has a charge of 1+?) O2-– negative ion • What is the name of the positive ion? Cu+ - copper (I) • What is the name of the negative ion? – change the ending to “ide” O2- - oxide Cu2O = Copper (I) oxide

  6. Naming Multivalent Metals • Example 3: PtCl4 • Identify the positive ion and the negative ion Pt4+ – positive ion Cl- – negative ion • What is the name of the positive ion? Pt4+– platinum (IV) • What is the name of the negative ion? – change the ending to “ide” Cl- - chloride PtCl4 = platinum (IV)chloride

  7. Naming Multivalent Metals

  8. Naming Polyatomic Ions • Poly = many • Atomic = atoms • Ions =with charge • *All Polyatomics are listed in your Data Booklets p. 5

  9. Naming Polyatomic Ions • Poly = many • Atomic = atoms • Ions =with charge • *All Polyatomics are listed in your Data Booklets p. 5

  10. Naming Polyatomic Ions • Example 1: NH4Cl • Identify the positive ion and the negative ion NH4+– positive ion Cl-– negative ion • What is the name of the positive ion? NH4+ – ammonium • What is the name of the negative ion? – change the ending to “ide” Cl- - chloride NH4Cl = ammonium chloride

  11. Naming Polyatomic Ions • Example 2: KNO3 • Identify the positive ion and the negative ion K+– positive ion NO3-– negative ion • What is the name of the positive ion? K+ – potassium • What is the name of the negative ion? – change the ending to “ide” unless it is a polyatomic ion! NO3- - nitrate KNO3 = potassium nitrate

  12. Naming Polyatomic Ions • Example 3: Cu(OH)2 • Identify the positive ion and the negative ion Cu2+– positive ion OH-– negative ion • What is the name of the positive ion? Cu2+ – copper (II) • What is the name of the negative ion? – change the ending to “ide” unless it is a polyatomic ion! OH- - hydroxide Cu(OH)2 = copper (II) hydroxide

  13. Formulas of Polyatomic Ions • Example 1: Magnesium sulphate • What is the charge of magnesium? 2+ • What is the charge of sulphate? 2- • To write the formula, we must balance the charges.

  14. Formulas of Polyatomic Ions • Example 2: Strontium nitrate • What is the charge of strontium? 2+ • What is the charge of nitrate? 1- • To write the formula, we must balance the charges.

  15. Formulas of Polyatomic Ions • Example 3: Calcium hydroxide • What is the charge of calcium? 2+ • What is the charge of hydroxide? 1- • To write the formula, we must balance the charges.

  16. Naming Polyatomic Ions

  17. In-Class Work • CYU 7.3 Q’s 2-5

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