Balance the following reaction: H₂O ---> H₂ + 0₂.

• 1,1,1
• 1,2,1
• 2,2,1
• 1,2,2

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

In chemical reactions, the law of conservation of mass is......

• disobeyed
• does not apply
• obeyed
• used sometime

Balance this equation, Ca + H₂O --> CaO + H₂

• Ca + 2H₂O --> CaO + 2H₂
• 2Ca + H₂O --> CaO + H₂
• Ca + H₂O --> CaO + H₂
• Cannot be balanced

Balance this equation,            Al₂O₃ ---> Al + O₂ 

• Cannot be balanced
• 2Al₂O₃ ---> 2Al + 3O₂ 
• 2Al₂O₃ ---> 4Al + 3O₂ 
• 3Al₂O₃ ---> 2Al + O₂ 

Name this reaction_, CO₂ + H₂O --> H₂CO₃ 

• Decomposition
• Single Replacement
• Synthesis
• Combustion

Name this reaction,  C₄H₁₂ + O₂ --> H₂O + CO₂

• Decomposition
• Single Replacement
• Double Replacement
• Combustion

Name this reaction, Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Balance this equation:  H₂ + N₂ → NH₃

•  H₂ + 4N₂ → NH₃
•  H₂ + 3N₂ → 2NH₃
•  3H₂ + N₂ → 2NH₃
•  2H₂ + 2N₂ → 2NH₃

Which is a Synthesis Reaction?

• A + B ----> AB
• AB -----> A + B
• AB + CD ----> AC +BC
• AB+ C ----> AC + B