Chemistry Properties and Structure of Matter: Properties of Matter - Naming Polyatomic Ions

This video tutorial covers the writing of chemical formulae and names for polyatomic ions and ionic compounds. It explains the rules for writing these formulae, including the use of parentheses for polyatomic ions, and provides examples such as barium nitrate and ammonium phosphate. The video also discusses naming conventions for ionic compounds, emphasizing the importance of memorizing common polyatomic ions. The tutorial concludes with a summary of the key points covered.

What is a polyatomic ion?

• An ion that only contains metals

• An ion made from a single atom

• An ion made from two or more atoms

• An ion with no charge

Why is it important to use parentheses when writing the chemical formula of ionic compounds with polyatomic ions?

• To separate the cation and anion

• To clarify the number of polyatomic ions present

• To show the number of atoms in the ion

• To indicate the charge of the ion

In the chemical formula of barium nitrate, why are parentheses used around nitrate?

• To indicate that nitrate is a cation

• To show that there are two nitrate ions

• To separate nitrate from barium

• To specify the charge of nitrate

When using the cross method to write the formula for ammonium phosphate, what is the correct ratio of ammonium to phosphate?

• 2:3

• 1:2

• 3:1

• 1:1

What is the correct name for the compound with the formula (NH4)2S?

• Ammonium sulfur

• Ammonium sulfite

• Ammonium sulfide

• Ammonium sulfate

Which of the following is a correct rule for naming polyatomic ions in ionic compounds?

• Add the prefix 'poly-'

• Write the name without modifications

• Specify the oxidation number

• Change the ending to '-ide'

What is the chemical formula for sodium hydrogen carbonate?

• NaCO3

• Na2HCO3

• Na2CO3

• NaHCO3

Which of the following ions is a monoatomic ion?

• Sulfate

• Ammonium

• Sodium

• Phosphate

What is the charge of the carbonate ion?

• 2-

• 3-

• 1-

• 1+

In naming ionic compounds, when should the ending '-ide' be used?

• For monoatomic anions

• For polyatomic cations

• For polyatomic anions

• For monoatomic cations