Polyatomic Ions and Potassium Chemistry

The video tutorial explains how to write the chemical formula for potassium dichromate. It begins by identifying the symbols for potassium and the dichromate ion, emphasizing the need to recognize polyatomic ions. The tutorial then discusses the charges of these ions and how to balance them to achieve a neutral compound. By adjusting the number of potassium ions, the tutorial demonstrates how to derive the correct formula, K2Cr2O7, ensuring the net charge is zero.

What is the symbol for potassium in the periodic table?

• P

• K

• Po

• Pt

Which of the following is a polyatomic ion?

• O2

• Cr2O7

• H2O

• K

What is the charge of the dichromate ion?

• 2+

• 1-

• 2-

• 1+

Where can you find the charge of a polyatomic ion if you haven't memorized it?

• By asking a friend

• In a chemistry textbook

• In a table of polyatomic ions

• On the periodic table

What is the charge of potassium in the periodic table?

• 1+

• 2-

• 2+

• 1-

How do you balance the charges to form potassium dichromate?

• Add more potassium atoms

• Use two potassium ions for each dichromate ion

• Add more dichromate ions

• Use one potassium ion for each dichromate ion