Balancing Chemical Equations Practice

The video tutorial demonstrates how to balance the chemical equation for the reaction between potassium nitrate (KNO3) and metallic potassium (K). The process involves counting the atoms of each element on both sides of the equation, then adjusting coefficients to ensure the same number of each type of atom appears on both sides. The tutorial covers balancing nitrogen, oxygen, and potassium atoms, resulting in a balanced chemical equation. The video concludes with a summary of the balanced equation.

What is the main purpose of balancing a chemical equation?

• To change the chemical properties of the reactants

• To increase the reaction rate

• To ensure the same number of each type of atom on both sides

• To decrease the energy required for the reaction

In the initial count, how many potassium atoms are present in the reactants?

• Four

• One

• Two

• Three

How many nitrogen atoms are present on the product side initially?

• Three

• Four

• Two

• One

What coefficient is used to balance the nitrogen atoms?

• 1

• 4

• 2

• 3

After balancing nitrogen, how many potassium atoms are there in total?

• Two

• Three

• Four

• Five

What is the coefficient placed in front of potassium oxide to balance oxygen atoms?

• 2

• 4

• 8

• 6

How many oxygen atoms are there on the reactant side after balancing?

• Nine

• Six

• One

• Three

What is the total number of potassium atoms needed on the product side to balance the equation?

• Sixteen

• Fourteen

• Twelve

• Ten

How many additional potassium atoms are added to achieve balance?

• Eight

• Fourteen

• Ten

• Twelve

What is the final balanced equation for the reaction?

• KNO3 + K → K2O + N2

• 6KNO3 + 2K → 3K2O + 2N2

• 4KNO3 + 6K → 2K2O + 3N2

• 2KNO3 + 10K → 6K2O + N2