Balancing Chemical Equations and Ions

In this video, Dr. B demonstrates how to balance the chemical equation for lead(II) nitrate reacting with zinc chloride. The process involves counting atoms and polyatomic ions, specifically the nitrate ion, and ensuring the same number of each type of atom appears on both sides of the equation. By treating the nitrate ion as a single unit, the equation becomes easier to balance. The video concludes with a confirmation that the equation is balanced and a brief summary of the steps taken.

What is the chemical formula for lead(II) nitrate?

• Pb(NO3)2

• Pb(NO2)3

• Pb(NO3)3

• Pb(NO2)2

Which of the following is a polyatomic ion in the given equation?

• Pb

• NO3

• Zn

• Cl

How many nitrate ions are present on the reactant side of the equation?

• Two

• Four

• One

• Three

What is the total number of chlorine atoms on the product side?

• Four

• Three

• One

• Two

Why is it easier to balance the equation by considering NO3 as a single unit?

• It changes during the reaction.

• It is not involved in the reaction.

• It simplifies the counting process.

• It appears only on one side.