Chromium-6 Carbonate Concepts

The video tutorial explains how to write the formula for chromium-6 carbonate. It begins by identifying chromium as a transition metal with a 6+ charge, indicated by the Roman numeral VI. The carbonate ion, CO3, is a polyatomic ion with a 2- charge. To balance the charges and achieve a neutral compound, three carbonate ions are needed to counter the 6+ charge of chromium. The final formula is Cr(CO3)3, and the compound is named chromium-6 carbonate, with the Roman numeral indicating the charge of chromium.

What is the element symbol for chromium in chromium-6 carbonate?

• Co

• Cu

• Cr

• Ca

What is the charge of the chromium ion in chromium-6 carbonate?

• 2+

• 3+

• 6+

• 4+

What is the charge of the carbonate ion?

• 4-

• 1-

• 2-

• 3-

Where can you find the carbonate ion if you don't memorize it?

• In a chemistry textbook

• On the periodic table

• In a table of polyatomic ions

• In a dictionary

Why must the charges in chromium-6 carbonate add up to zero?

• Because it is a polyatomic ion

• Because it is an acid

• Because it is a neutral compound

• Because it is a metal

How many carbonate ions are needed to balance the charge of one chromium ion in chromium-6 carbonate?

• Four

• Two

• Three

• One

What is the correct formula for chromium-6 carbonate?

• CrCO3

• Cr2(CO3)3

• Cr(CO3)3

• Cr3(CO3)2

How is the charge of chromium indicated in the name chromium-6 carbonate?

• By the word 'neutral'

• By the prefix 'hexa-'

• By the suffix '-ate'

• By the Roman numeral VI