Chemical Reactions and Balancing Equations Quiz

Which of the following best describes the Law of Conservation of Mass?

• Mass is created during a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed during a chemical reaction.

• Mass is only conserved in physical changes.

What is the balanced equation for the combustion of methane (CH₄)?

• CH₄ + O₂ → CO₂ + H₂O

• CH₄ + 2O₂ → CO₂ + 2H₂O

• 2CH₄ + O₂ → 2CO₂ + 2H₂O

• CH₄ + O₂ → CO + H₂O

In the reaction 2H₂ + O₂ → 2H₂O, what type of reaction is occurring?

• Synthesis

• Decomposition

• Combustion

• Single replacement

Which of the following is a decomposition reaction?

• 2H₂O → 2H₂ + O₂

• H₂ + Cl₂ → 2HCl

• C₆H₅ + 5O₂ → 3CO₂ + 4H₂O

• Na + Cl₂ → 2NaCl

Identify the type of reaction: Zn + 2HCl → ZnCl₂ + H₂

• Synthesis

• Decomposition

• Single replacement

• Double replacement

Which of the following reactions is a double replacement reaction?

• AgNO₃ + NaCl → AgCl + NaNO₃

• 2H₂ + O₂ → 2H₂O

• C + O₂ → CO₂

• 2Na + Cl₂ → 2NaCl

What is the balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

• Al + O₂ → Al₂O₃

• 4Al + 3O₂ → 2Al₂O₃

• 2Al + O₂ → Al₂O₃

• Al + 2O₂ → Al₂O₃

In the reaction 2KClO₃ → 2KCl + 3O₂, what is the role of KClO₃?

• Reactant

• Product

• Catalyst

• Inhibitor

Which of the following is a combustion reaction?

• C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

• 2H₂O → 2H₂ + O₂

• Na + Cl₂ → 2NaCl

• AgNO₃ + NaCl → AgCl + NaNO₃

What type of reaction is represented by the equation: 2Na + 2H₂O → 2NaOH + H₂?

• Synthesis

• Decomposition

• Single replacement

• Double replacement