Reactions Review

The reaction XY ⟶ X + Y is an example of _____.

• synthesis

• decomposition

• single replacement

• double replacement

The reaction AB + X ⟶ XB + A is classified as a _____ reaction.

• synthesis

• decomposition

• single replacement

• double replacement

What class of reaction best describes the equation below?

2HI ⟶ H₂ + I₂

• synthesis

• decomposition

• single replacement

• double replacement

What class of reaction best describes the equation below?

CH₄ + O₂ ⟶ CO₂ + H₂O

• single replacement

• double replacement

• decomposition

• combustion

What class of reaction best describes the equation below?

MgCO₃ ⟶ MgO + CO₂

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Which of the following is an example of a decomposition reaction?

• 2NaF ⟶ 2 Na + F₂

• P₂O₅ + 3 H₂O ⟶ 2H₃PO₄

• 2FeCl₃ + 3Zn ⟶ 2Fe + 3ZnCl₂

• C₆H₁₂O₆ + 6O₂ ⟶ 6CO₂ + 6 H₂O

Which of the following is an example of a synthesis reaction?

• Cl₂ + 2NaBr ⟶ 2NaCl + Br₂

• MgO + CO₂ ⟶ MgCO₃

• FeBr₃ + K₃PO₄ ⟶ FePO₄ + 3KBr

• 2Na₂O₂ ⟶ 2Na₂O + O₂

Classify the following chemical reaction: 

 

CaBr₂ + AgNO₃ ⟶ AgBr + Ca(NO₃)₂

• synthesis

• double replacement

• single replacement

• decomposition

Answer explanation

AB + CD -> AC + BD

Double Replacement

Classify this reaction:

NO₂ →N₂ + O₂

• Synthesis

• Decomposition
• Single replacement
• Combustion

Classify this reaction:

2H₂ + O₂ ⟶ 2H₂O

• synthesis reaction

• decomposition reaction

• single replacement reaction

• double displacement reaction