Chemical Reaction

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

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• 2
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• 4

Which equation is balanced?

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

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What law governs the balancing of chemical equations?

• Law of Energy

• Law of Conservation of Matter/Mass

• Law of Gravity

• Law of Matter Movement

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

What are the coefficients that would properly balance this equation?

__Ca + __H₂O --> __Ca(OH)₂ + __H₂

• 2,1 --> 2,1

• 1,2 --> 1,1

• 1,2 --> 2,4

• 1,2 --> 2,1

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

What are the coefficients that would properly balance this equation?

__Al + __O₂--> __Al₂O₃

• 4,1 --> 2

• 4,3 --> 4

• 3,4 --> 1

• 4,3 --> 2

Which number should go in the blank?
Mn + _ HNO₃ → Mn(NO₃)₂ + H₂

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• 0

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.