Ionic Compounds and Their Properties

The video provides a comprehensive review of ionic compounds, focusing on how to determine and write their formulas. It covers metals with known and unknown charges, the use of Roman numerals, and the role of polyatomic ions. The tutorial includes examples like sodium phosphite and lead dichromate, emphasizing the importance of not altering polyatomic ions. It also highlights common mistakes and offers tips for writing correct formulas.

What is the charge of a metal in an ionic compound if it is in the first group of the periodic table?

• -2

• -1

• +2

• +1

How do you denote the charge of a metal with an unknown charge in its name?

• By using a suffix

• By using a subscript

• By using a prefix

• By using a Roman numeral

What is the charge of sulfate (SO4) in ionic compounds?

• 2-

• 2+

• 1-

• 1+

When writing the formula for sodium phosphite, what is the subscript for sodium (Na)?

• 1

• 4

• 2

• 3

What is the correct name for the compound with the formula CoS?

• Copper Sulfide

• Cobalt Sulfate

• Cobalt Sulfide

• Copper Sulfate

What is the charge of lead in lead(IV) dichromate?

• +5

• +2

• +3

• +4

How many nitrate ions (NO3) are needed to balance the charge of mercury in mercury(II) nitrate?

• 1

• 2

• 3

• 4

What is the formula for calcium sulfate after reducing the subscripts?

• CaSO4

• Ca2SO4

• Ca2(SO4)2

• Ca(SO4)2

What is the charge of silver in silver carbonate (Ag2CO3)?

• +4

• +3

• +2

• +1

What is the correct formula for magnesium chloride?

• Mg2Cl2

• Mg2Cl

• MgCl2

• MgCl