Chromium Compounds and Ions

The video tutorial explains how to write the formula for chromium 6 dichromate. It begins by identifying the element symbol for chromium and understanding the significance of the Roman numeral indicating its charge. The tutorial then discusses polyatomic ions, specifically the dichromate ion, and how to balance charges to achieve a neutral compound. The process of writing the formula is detailed, followed by instructions on naming the compound based on its formula.

What is the element symbol for chromium?

• Cr

• Cm

• Ch

• Co

What is the charge on the chromium in Chromium 6 Dichromate?

• 6+

• 3+

• 4+

• 2-

What is the formula for the dichromate ion?

• CrO4

• Cr2O7

• CrO3

• Cr3O8

What is the charge of the dichromate ion?

• 1-

• 3-

• 2-

• 2+

How many dichromate ions are needed to balance the charge of Chromium 6 Dichromate?

• One

• Two

• Three

• Four

Why are parentheses used in the formula for Chromium 6 Dichromate?

• To separate elements

• To show the charge

• To indicate multiple ions

• To denote a single ion

What would be the name of the compound with the formula Cr2O7?

• Chromium 3 Dichromate

• Chromium 3 Chromate

• Chromium 6 Dichromate

• Chromium 6 Chromate