Balancing Review

3Na₄

What is the coefficient?

• 1

• 2

• 3

• 4

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

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

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

• Ca + 2H₂O --> CaO + 2H₂
• 2Ca + H₂O --> CaO + H₂
• Its balanced as it is
• Cannot be balanced

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

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

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

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

_{Name this reaction,} CO₂+ H₂O --> H₂CO₃ 

• Decomposition
• Single Replacement
• Synthesis
• Combustion

Which problem is balanced?

• PbO2 + 2H2
• So2 + H20 --> H2SO4
• 2Na + 2H2O --> 2NaOH + H2
• Lord Have Mercy - I am in Trouble

What is a yield?

• The arrow in an equation that represents the chemical reaction.
• The beginning substances.
• The yellow light at a stop light
• What my parents say when I run to fast

Is this equation balanced?:                               CS₂ + 20₂ --> CO₂ +2SO₂

• Yes
• No

What is a reactant?

• The chemical substances that begin the reaction.
• What comes from the reaction.
• A very hyper bobcat
• something in an energy drink