Understanding Sulfite Ions and Chromium Compounds

The video tutorial explains how to write the chemical formula for chromium(III) sulfite. It begins by identifying the element symbols and charges for chromium and sulfite. The tutorial explains that the sulfite ion is SO3 with a 2- charge, and chromium has a 3+ charge. To balance these charges and achieve a neutral compound, the crisscross method is used, resulting in the formula Cr2(SO3)3. The video concludes by verifying the formula to ensure the charges add up to zero.

What does the Roman numeral III indicate in Chromium III Sulfite?

• The charge on the sulfite ion

• The number of chromium atoms

• The charge on the chromium ion

• The number of sulfite ions

Where can you find information about the sulfite ion?

• In a table of elements

• In a table of polyatomic ions

• In a table of metals

• On the periodic table

What is the charge of the sulfite ion?

• 0

• 1+

• 2-

• 3+

Why do the charges in Chromium III Sulfite need to add up to zero?

• To make the compound acidic

• To make the compound reactive

• To make the compound neutral

• To make the compound stable

What is the crisscross method used for?

• To balance ionic charges

• To determine the number of atoms

• To balance chemical equations

• To find the atomic mass

How many sulfite ions are needed in the formula for Chromium III Sulfite?

• Four

• Three

• Two

• One

What is the final formula for Chromium III Sulfite?

• Cr(SO3)2

• Cr2(SO3)3

• CrSO3

• Cr3(SO3)2

How do you verify the correctness of the formula for Chromium III Sulfite?

• By checking the color of the compound

• By ensuring the charges add up to zero

• By checking the atomic mass

• By counting the number of atoms