Balancing Chemical Equations Concepts

In this video, Dr. B demonstrates how to balance the chemical equation of iron(II) sulfide (FeS) reacting with hydrochloric acid (HCl). The process involves counting the atoms on both sides of the equation, identifying the imbalance, and then using coefficients to balance the hydrogen and chlorine atoms. By placing a coefficient of 2 in front of HCl, the equation is balanced, ensuring equal numbers of each type of atom on both sides. The video concludes with a confirmation of the balanced equation.

What is the initial count of hydrogen atoms on the reactant side of the equation?

• Four

• Three

• Two

• One

Which element's atoms are doubled to balance the equation?

• Hydrogen

• Oxygen

• Sulfur

• Iron

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

• 1

• 2

• 3

• 4

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

• Four

• Three

• Two

• One

What is the chemical formula for iron(II) sulfide?

• FeS

• Fe2S3

• FeSO4

• Fe2O3

What is the final balanced equation for the reaction between FeS and HCl?

• FeS + HCl → FeCl3 + H2S

• FeS + 2HCl → FeCl3 + H2S

• FeS + HCl → FeCl2 + H2S

• FeS + 2HCl → FeCl2 + H2S