Balancing Chemical Equations Practice

The video tutorial explains how to balance a chemical equation involving H2S, O2, H2O, and SO2. It begins by counting the atoms on each side of the equation and identifies the need to balance the oxygen atoms first. The tutorial then proceeds to balance hydrogen and sulfur atoms by adjusting coefficients. Finally, it demonstrates the steps to achieve a balanced equation, emphasizing the importance of starting with an even number of oxygen atoms.

What are the initial counts of hydrogen, sulfur, and oxygen atoms on the reactant side of the equation?

• 2 hydrogen, 1 sulfur, 2 oxygen

• 2 hydrogen, 2 sulfur, 1 oxygen

• 2 hydrogen, 1 sulfur, 3 oxygen

• 1 hydrogen, 1 sulfur, 3 oxygen

How many oxygen atoms are there on the product side before any adjustments?

• 5

• 3

• 2

• 4

What change is made to balance the oxygen atoms in the equation?

• Add a coefficient of 3 to H2S

• Add a coefficient of 2 to SO2

• Add a coefficient of 2 to H2O

• Add a coefficient of 3 to O2

After adjusting the coefficient of H2O, how many hydrogen atoms are on the product side?

• 3

• 5

• 2

• 4

What adjustment is made to balance the hydrogen atoms?

• Add a coefficient of 3 to H2O

• Add a coefficient of 2 to O2

• Add a coefficient of 3 to SO2

• Add a coefficient of 2 to H2S

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

• 2

• 1

• 4

• 3

What is the next step to balance the sulfur atoms?

• Add a coefficient of 3 to H2O

• Add a coefficient of 3 to H2S

• Add a coefficient of 2 to SO2

• Add a coefficient of 2 to O2

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

• 4

• 7

• 5

• 6

What final adjustment is made to balance the oxygen atoms?

• Add a coefficient of 3 to O2

• Add a coefficient of 2 to H2O

• Add a coefficient of 3 to SO2

• Add a coefficient of 2 to H2S

What is the balanced chemical equation for the reaction?

• H2S + 2 O2 → H2O + 2 SO2

• 2 H2S + O2 → 2 H2O + SO2

• H2S + O2 → H2O + SO2

• 2 H2S + 3 O2 → 2 H2O + 2 SO2