Potassium Carbonate and Ionic Compounds

The video tutorial explains how to write the formula for potassium carbonate. It begins by identifying potassium and carbonate ions, highlighting that carbonate is a polyatomic ion. The tutorial then discusses the nature of ionic compounds and the importance of balancing charges. Using the crisscross method, the video demonstrates how to derive the correct formula, K2CO3, and verifies the result by ensuring the net charge is zero.

What is the element symbol for potassium?

• P

• Po

• K

• Pt

Which of the following is a polyatomic ion?

• H2O

• NaCl

• CO3

• O2

What type of compound is formed between potassium and carbonate?

• Covalent

• Ionic

• Molecular

• Metallic

What is the charge on a potassium ion?

• 2-

• 1+

• 2+

• 1-

What is the charge on a carbonate ion?

• 1+

• 2-

• 3+

• 2+

Which method is used to balance the charges in ionic compounds?

• Cross-multiply

• Crisscross

• Substitution

• Elimination

How many potassium ions are needed to balance one carbonate ion?

• Two

• One

• Four

• Three

What is the net charge of a correctly balanced potassium carbonate compound?

• 2-

• 3+

• 1+

• 0

What is the correct chemical formula for potassium carbonate?

• K2CO2

• K3CO3

• KCO3

• K2CO3