Ionic Compounds and Chromate Concepts

The video tutorial explains how to write the chemical formula for lead(II) chromate. It begins by identifying the element symbols for lead and chromate, noting that lead is a transition metal with a 2+ charge, and chromate is a polyatomic ion with a 2- charge. The tutorial emphasizes the importance of balancing these charges to achieve a neutral compound, resulting in the formula PbCrO4. The video also highlights the nature of polyatomic ions and the concept of ionic compounds.

What does the Roman numeral II indicate in the name lead(II) chromate?

• The atomic number of lead

• The number of lead atoms

• The charge of the lead ion

• The number of chromate ions

Which of the following is true about chromate?

• It has a charge of 2+

• It is a metal

• It is a polyatomic ion with a charge of 2-

• It is a single element found on the periodic table

What is the chemical formula for chromate?

• Cr2O7

• CrO4

• CrO3

• CrO2

Why is lead(II) chromate considered an ionic compound?

• It is composed of only metals

• It is composed of nonmetals only

• It consists of a metal and a polyatomic ion

• It is a covalent compound

What must the charges in an ionic compound do?

• Add up to a negative charge

• Add up to a positive charge

• Remain unbalanced

• Add up to zero

What is the final formula for lead(II) chromate?

• PbCrO4

• Pb2CrO4

• PbCrO3

• PbCr2O7