Balancing Chemical Equations Concepts

The video tutorial demonstrates how to balance the chemical equation for zinc sulfide (ZnS) reacting with hydrochloric acid (HCl). It begins by counting the atoms on both sides of the equation, then balances the hydrogen and chlorine atoms by adding a coefficient of two in front of HCl. The video also discusses the states of matter for each compound, identifying zinc sulfide as a solid, hydrochloric acid as aqueous, and hydrogen sulfide as a gas. The tutorial concludes with a balanced equation and a brief summary by Dr. B.

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

• Two

• Three

• Four

• One

Which element's atoms need to be doubled to balance the equation?

• Oxygen

• Hydrogen

• Sulfur

• Zinc

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

• 3

• 2

• 1

• 4

What is the state of zinc sulfide in the balanced equation?

• Aqueous

• Solid

• Gas

• Liquid

Which compound is expected to be a gas in the balanced equation?

• Hydrogen sulfide

• Zinc sulfide

• Hydrochloric acid

• Zinc chloride

What is the state of hydrochloric acid in the balanced equation?

• Aqueous

• Solid

• Liquid

• Gas