Balancing Chemistry Equations

How many Oxygens are in this molecule? 
(OH)₂

• 4
• 1
• 2
• 3

What are the smaller numbers that you CANNOT change in a chemical equation? 

• Coefficient
• Products
• Reactants
• Subscript

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 
• Products
• Reactants
• Subscripts

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

• 1
• 2
• 3
• 4

Pb(NO₃)₂  +  KI --> PbI₂ + KNO₃
What type of reaction is this? 

• Synthesis 
• Decomposition 
• Single Replacement
• Double Replacement 

What type of reaction is this?  
__H₂O₂ ---->  __H₂O + O₂

• Synthesis
• Decomposition 
• Single Replacement
• Combustion 

What law governs the balancing of chemical equations? 

• Law of Energy
• Law of Conservation of Matter/Mass
• Law of Gravity
• Law of Matter Movement 

Balance this equation: _Zn + _O2 --> _ZnO

• 1, 1, 2

• 2, 1, 2

• 1, 1, 1

• 2 ,2, 2

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes
• No

Which side of the yield sign are the reactants found?

• to the left

• to the right

• in the middle