Dichromate and Potassium Ions

The video tutorial explains how to name the compound K2Cr2O7, known as potassium dichromate. It begins by identifying potassium as a metal and Cr2O7 as the dichromate ion. The tutorial outlines the steps to write the name by first identifying the metal and then the polyatomic ion. It also covers how to write the chemical formula from the name by understanding the ionic charges of the components. The video concludes with a brief closing statement.

What is the polyatomic ion present in K2Cr2O7?

• Nitrate

• Dichromate

• Sulfate

• Phosphate

What is the first step in naming K2Cr2O7?

• Identify the charge of the ion

• Write the name of the metal

• Determine the molecular weight

• Find the oxidation state

Which group does potassium belong to on the periodic table?

• Group 4

• Group 3

• Group 2

• Group 1

What is the charge of the dichromate ion?

• 4-

• 3-

• 2-

• 1-

How many potassium ions are needed to balance the charge of one dichromate ion?

• Three

• Two

• Four

• One

What is the overall charge of K2Cr2O7?

• 0

• 1+

• 2+

• 3+

Who is the narrator of the video?

• Dr. D

• Dr. C

• Dr. B

• Dr. A