Balancing Fun

Which of the following is an unbalanced equation?

• CaCO₃ --> CaO + CO₂
• PbO₂ + 2H₂-->2Pb + H₂O
• 2Na+ 2H₂O-->2NaOH + H₂
• CS₂ + 2O₂ --> CO₂ + 2SO₂

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃
• 2 Fe + 3O₂ -> Fe₂O₆
• 4 Fe + O₆ -> 2Fe₂O₃
• None of the options are correctly balanced.

Which equation is balanced?

• 3 P₄+1 O₂ ---> 2 P₂O₃
• 1 P₄+1 O₂ ---> 2 P₂O₃
• 1 P₄+ 3 O₂ ---> 2 P₂O₃
• 1 P₄+ 2 O₂ ---> 3 P₂O₃

Which equation is balanced?

• 1 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 2 Na₃PO₄+2 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 1 Na₃PO₄+2 KOH
  --->
  2 NaOH +  1 K₃PO₄
• 3 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄

Which equation is balanced?

• 1 BaS + 1 PtF₂ 
  --->
   1 BaF₂ + 1 PtS
• 4 BaS + 2 PtF₂ 
  --->
   1 BaF₂ +  1 PtS
• 1 BaS + 2 PtF₂ 
  --->
   2 BaF₂ +  2 PtS
• 1 BaS + 3 PtF₂ 
  --->
   1 BaF₂ +  2 PtS