Chromate Ion and Lead Chemistry

The video tutorial explains how to write the formula for lead(IV) chromate. It begins by identifying lead as Pb with a 4+ charge and chromate as a polyatomic ion, CrO4, with a 2- charge. To balance the charges and achieve a neutral compound, two chromate ions are needed, resulting in the formula Pb(CrO4)2. The tutorial also covers naming the compound, emphasizing the importance of indicating the charge of lead with a Roman numeral due to its status as a post-transition metal.

What is the element symbol for lead?

• Pb

• Le

• Pd

• Ld

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

• 2+

• 3+

• 4+

• 1+

What is the formula for the chromate ion?

• CrO3

• CrO4

• CrO2

• Cr2O7

Why do we need two chromate ions in lead(IV) chromate?

• To change the color

• To balance the charge of lead

• To make it soluble

• To increase the mass

What is the overall charge of the chromate ion?

• 2-

• 1-

• 4-

• 3-

Why are parentheses used in the formula Pb(CrO4)2?

• To highlight the charge

• To denote a single ion

• To show a complex ion

• To indicate multiple ions

What is the correct formula for lead(IV) chromate?

• PbCr2O7

• Pb2CrO4

• Pb(CrO4)2

• PbCrO4

What type of metal is lead classified as?

• Alkali metal

• Alkaline earth metal

• Post-transition metal

• Transition metal

Why is a Roman numeral used in the name of lead(IV) chromate?

• To indicate the number of atoms

• To denote the molecular weight

• To specify the color

• To show the oxidation state