Balancing Chemical Equations and Atoms

The video tutorial demonstrates how to balance a chemical equation involving iron and nitric acid. It begins by counting the atoms on each side of the equation, highlighting the complexity of the task. The instructor, Dr. B, guides through balancing hydrogen atoms first, followed by nitrogen and oxygen atoms, using coefficients to achieve balance. The process involves iterative adjustments to ensure all atoms are balanced, concluding with a balanced equation for Fe plus HNO3.

What is the initial number of iron atoms on the reactant side of the equation?

• Four

• Three

• Two

• One

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

• Three

• Four

• Five

• Two

What is the first step taken to balance the hydrogen atoms?

• Add a coefficient of 4 in front of Fe

• Add a coefficient of 3 in front of H2O

• Add a coefficient of 5 in front of NO

• Add a coefficient of 2 in front of HNO3

After balancing hydrogen atoms, how many nitrogen atoms are present on the reactant side?

• Four

• One

• Two

• Three

What adjustment is made to balance the nitrogen atoms?

• Change the coefficient of H2O to 3

• Change the coefficient of HNO3 to 4

• Change the coefficient of Fe to 2

• Change the coefficient of NO to 5

How many total oxygen atoms are there after balancing the nitrogen atoms?

• Thirteen

• Twelve

• Eleven

• Ten

What coefficient is used in front of H2O to balance the hydrogen atoms finally?

• One

• Two

• Four

• Three

How many total oxygen atoms are there after the final balancing step?

• Eleven

• Thirteen

• Ten

• Twelve

What is the final balanced equation for the reaction between iron and nitric acid?

• Fe + 5HNO3 → Fe(NO3)4 + 3H2O + NO

• Fe + 2HNO3 → Fe(NO3) + H2O + NO

• Fe + 3HNO3 → Fe(NO3)2 + H2O + NO

• Fe + 4HNO3 → Fe(NO3)3 + 2H2O + NO

Who is the narrator of the video?

• Dr. D

• Dr. B

• Dr. A

• Dr. C