Balancing Chemical Equations and Ions

This video tutorial demonstrates how to balance the chemical equation for lead nitrate and potassium carbonate. It explains the importance of counting atoms and polyatomic ions, and provides a step-by-step guide to balancing the equation. The tutorial emphasizes the utility of treating polyatomic ions as single units to simplify the balancing process.

What are the reactants in the chemical equation discussed in the video?

• Lead nitrate and potassium carbonate

• Lead acetate and potassium permanganate

• Lead sulfate and potassium chloride

• Lead oxide and potassium hydroxide

How many nitrate ions are present in the reactants?

• Two

• Four

• One

• Three

What is the significance of polyatomic ions in balancing chemical equations?

• They change during the reaction

• They are counted as individual atoms

• They are ignored in balancing

• They stay together and simplify balancing

What coefficient is used in front of KNO3 to balance the equation?

• 3

• 2

• 1

• 4

How many potassium atoms are there on the product side after balancing?

• One

• Two

• Three

• Four

Why is it useful to count polyatomic ions as single units?

• It increases the number of steps

• It simplifies the balancing process

• It is required by chemical laws

• It makes the equation more complex

What is the final balanced equation for the reaction?

• Pb(NO3)2 + K2CO3 → 2PbCO3 + KNO3

• 2Pb(NO3)2 + K2CO3 → PbCO3 + KNO3

• Pb(NO3)2 + 2K2CO3 → PbCO3 + KNO3

• Pb(NO3)2 + K2CO3 → PbCO3 + 2KNO3

What is the role of Dr. B in the video?

• He is a teacher grading a test

• He is the narrator explaining the equation

• He is a chemist conducting an experiment

• He is a student