Chemical Reactions and Balancing Equations

The video tutorial explains the chemical reaction between silver (Ag) and hydrogen sulfide (H2S), which results in silver tarnish. The instructor, Dr. B, demonstrates how to balance the chemical equation for this reaction. Initially, the equation is unbalanced with respect to silver atoms. By adding a coefficient of two in front of the silver, the equation becomes balanced, ensuring the number and type of atoms on both sides are equal. The tutorial concludes with a balanced equation for Ag plus H2S.

What causes silver to tarnish when exposed to certain gases?

• Reaction with hydrogen sulfide

• Reaction with oxygen

• Reaction with nitrogen

• Reaction with carbon dioxide

In the reaction between Ag and H2S, what is the product formed that causes tarnishing?

• AgCl

• Ag2S

• AgNO3

• Ag2O

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

• Four

• Three

• Two

• One

Which element's atoms are not balanced in the initial equation?

• Oxygen

• Hydrogen

• Sulfur

• Silver

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

• Four

• Three

• Two

• One

After balancing, what is true about the atoms on both sides of the equation?

• The number of atoms is different

• The type of atoms is different

• The equation is still unbalanced

• The number and type of atoms are the same