Balancing Chemical Equations

The video tutorial demonstrates how to balance the chemical equation Al2S3 + H2. It begins by counting the atoms on both sides of the equation, identifying the need to balance sulfur, hydrogen, and aluminum atoms. The instructor first balances the sulfur atoms by adding a coefficient of 3 in front of H2S, then adjusts the hydrogen atoms by placing a coefficient of 3 in front of H2. Finally, the aluminum atoms are balanced by adding a coefficient of 2 in front of Al. The video concludes with a balanced equation and a brief sign-off from the instructor.

What is the initial count of aluminum atoms on the reactant side?

• Two

• One

• Four

• Three

How many sulfur atoms are needed on the product side to balance the equation?

• Three

• Four

• Two

• One

What coefficient is placed in front of H2S to balance sulfur atoms?

• 3

• 2

• 1

• 4

After balancing sulfur, how many hydrogen atoms are present on the product side?

• Six

• Eight

• Four

• Two

What coefficient is used in front of H2 to balance hydrogen atoms?

• 4

• 2

• 1

• 3

What is the final coefficient placed in front of Al to balance the equation?

• 4

• 1

• 3

• 2

What is the balanced chemical equation for aluminum sulfide reacting with hydrogen gas?

• 2Al2S3 + 3H2 → 4Al + 3H2S

• Al2S3 + H2 → Al + H2S

• Al2S3 + 3H2 → 2Al + 3H2S

• Al2S3 + 2H2 → 2Al + 2H2S