Polyatomic Ions and Ionic Compounds

The video tutorial explains how to name ternary ionic compounds, which consist of three different elements. It covers the structure of these compounds, emphasizing the positive and negative halves. The role of polyatomic ions, such as ammonium and carbonate, is discussed, along with how to write formulas and balance charges. The tutorial provides examples of ternary compounds, highlighting the importance of correct naming conventions and the use of parentheses when dealing with multiple polyatomic ions.

What is the primary difference between binary and ternary ionic compounds?

• Binary compounds have two elements, ternary have three.

• Binary compounds have three elements, ternary have two.

• Binary compounds are always metals, ternary are non-metals.

• Binary compounds have only positive ions, ternary have only negative ions.

Which of the following is a common polyatomic ion used in ternary ionic compounds?

• Chloride

• Ammonium

• Sodium

• Oxide

When writing formulas for ternary ionic compounds, what should you do if the charges are not balanced?

• Add more positive ions.

• Add more negative ions.

• Cross down the charges.

• Ignore the imbalance.

In the compound Na2CO3, what does the subscript '2' indicate?

• Two sodium ions are present.

• Two carbonates are present.

• Two oxygen atoms are present.

• Two compounds are combined.

How can you identify a polyatomic ion in a compound's name?

• It is always a metal.

• It ends with 'ide'.

• It is a single element.

• It often ends with 'ate' or 'ite'.

What is the correct formula for aluminum phosphate?

• Al3PO4

• Al2P3

• AlPO4

• AlP

Which of the following is true about the use of parentheses in ternary ionic compounds?

• Parentheses are used for single ions.

• Parentheses are used only for positive ions.

• Parentheses are never used in ternary compounds.

• Parentheses are used when there is more than one polyatomic ion.

What is the charge of the polyatomic ion sulfate?

• -2

• +2

• -1

• +1

In the compound Mn3(AsO4)4, what does the subscript '3' outside the parentheses indicate?

• Three oxygen atoms are present.

• Three manganese ions are present.

• Three arsenate ions are present.

• Three compounds are combined.

Why is it incorrect to leave parentheses when there is only one polyatomic ion?

• It is not the correct convention.

• It changes the charge of the ion.

• It makes the compound unstable.

• It is only used for binary compounds.