Balancing Chemical Equations Concepts

This video tutorial demonstrates how to balance the chemical equation ZnS + HCl. It begins by counting the atoms on each side of the equation, identifying the need to double the hydrogen and chlorine atoms. By placing a coefficient of two in front of HCl, the equation is balanced, resulting in ZnCl2 + H2S. The tutorial concludes with a summary of the balanced equation.

What are the reactants in the chemical equation discussed in the video?

• Zinc and sulfuric acid

• Zinc chloride and hydrogen sulfide

• Zinc sulfide and hydrochloric acid

• Hydrogen and chlorine

How many hydrogen atoms are present on the product side before balancing?

• Four

• Three

• Two

• One

What is the main issue identified with the initial chemical equation?

• Excess of hydrochloric acid

• Imbalance of hydrogen and chlorine atoms

• Too few sulfur atoms

• Too many zinc atoms

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

• One

• Four

• Two

• Three

What is the balanced chemical equation for the reaction?

• ZnS + H2 → Zn + H2S

• ZnS + HCl → ZnCl + H2S

• Zn + HCl → ZnCl2 + H2

• ZnS + 2HCl → ZnCl2 + H2S