Chemical Reactions

Is the following equation balanced?

4Fe + 3O₂ ---> 2Fe₂O₃

• YES

• NO

CaCO₃ ----> CaO + CO₂

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

Pb + FeSO₄ ----> PbSO₄ + Fe

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

What type of reaction occurs between an element and a compound?

Ex: Zn + 2HCl --> ZnCl₂ + H₂

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

What kind of reaction is this:
2H₂ + O₂ --> 2H₂O

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Answer explanation

Two or more elements/ compounds combine to make a more complex substance.

Ex: A + B --> AB

What kind of reaction is this:
4Fe  +  3O₂ →   2Fe₂O₃ 

• Synthesis

• Decomposition

• Single Replacement 

• Double Replacement

Answer explanation

Two or more elements/ compounds combine to make a more complex substance

Ex: A + B --> AB

What kind of reaction is this:
2H₂O₂ →2 H₂O + O₂

• Synthesis

• Decomposition

• Single Replacement 

• Combustion

Answer explanation

Compounds break down 

into simpler substances.

Ex: AB --> A + B

An element and a different element react to form one product- this is an example of which type of chemical reaction? 

• combustion
• decomposition 
• synthesis 
• single replacement

Answer explanation

Ex: A + B --> AB

Which type of reaction can be recognized by the general pattern?
A + BC--> AC + B

• Decomposition

• Combustion

• Single Replacement

• Double Replacement

Answer explanation

Reactants: a single element and a compound

Products: a new compound and a different single element

Which of the following general formulas represents a single-displacement reaction?

• AB → A + B   
• A + B → AB
• A + BC → AC + B
• AB + CD → AD + CB

Answer explanation

Reactants: a single element and a compound

Products: a new compound and a different single element