Ionic Compounds and Polyatomic Ions

This video tutorial focuses on writing formulas for ionic compounds. It begins with basic examples and progresses to more complex ones involving polyatomic ions and transition metals. The tutorial explains the charges of common ions and how to use the crisscross method to write formulas. It also covers the naming and formulas of polyatomic ions and the use of Roman numerals for transition metals.

What charge do elements in the first column of the periodic table typically form?

• -2

• -1

• +2

• +1

How do you write the formula for an ionic compound if the charges are equal?

• Add the charges together

• Subtract the charges

• Write the ions together in a 1:1 ratio

• Use the crisscross method

What is the formula for calcium sulfide?

• CaS

• Ca2S

• Ca2S2

• CaS2

Which method is used to write formulas for ionic compounds with different charges?

• Multiplication method

• Subtraction method

• Addition method

• Crisscross method

What is the formula for lithium oxide using the crisscross method?

• Li2O2

• LiO2

• Li2O

• LiO

What is the name of the polyatomic ion NO3-?

• Nitrogen

• Nitride

• Nitrate

• Nitrite

What is the formula for sulfate?

• SO4 1-

• SO2 2-

• SO4 2-

• SO3 2-

What does the Roman numeral in a compound name indicate?

• The type of metal

• The number of bonds

• The charge of the metal

• The number of atoms

What is the formula for iron(III) sulfide?

• FeS

• Fe2S3

• Fe3S2

• FeS2

How do you simplify the formula Pb2O4?

• PbO2

• Pb2O

• Pb2O2

• PbO