Balancing Chemical Reactions

__Na + __Cl₂ --> __NaCl

• 1,1,2
• 2,1,2
• 2,1,1
• already balanced

__H₂O₂ --> __H₂O + __O₂

• already balanced
• 2,1,1
• 2,2,1
• 2,1,2

__NaClO₃ --> __NaCl + __O₂

• 2,2,2
• 2,2,3
• 3,2,2
• 1,2,3

__BF₃ + __Li₂SO₃ --> __B₂(SO₃)₃ + __LiF

• 2,3,1,3
• 2,3,1,6
• 4,4,2,12
• 3,3,1,9

__C₆H₁₂O₆ + __O₂ --> __H₂O + __CO₂

• 1,6,6,6
• already balanced
• 1,6,1,6
• 2,12,12,12

_AgNO₃ + _Cu →_Cu(NO₃)₂ + _Ag

• 2 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 1 Ag
• 2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag
• 1 AgNO₃ + 2 Cu → 2 Cu(NO₃)₂ + 1 Ag
• 3 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 2 Ag

__(NH₄)₃PO₄ + __Pb(NO₃)₄ --> __Pb₃(PO₄)₄ + __NH₄NO₃

• 2,1,1,6
• 1,2,2,3
• 4,3,1,12
• 4,2,1,12

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H₂O --> __NaOH + __H₂

• 2,2 --> 2,1
• 4,4 --> 4,1
• 1,2 --> 2,4
• 1,2 --> 2,1

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl