Chemical Reactions and Balancing Equations Test

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Combination Reaction (composition/ synthesis)

Look For: One Product

Example of Combination Reaction

2 H2+O2 -------> 2 H20

Decompostion Reaction

Look for: One Reactant

Example of Decompostion Reaction

CaCO3 --------> CaO+CO2

Single Replacement (Displacement)

Look for: an element by itself on the left side that's taken the place of another in a compound on the right side

Example of Single Replacement

Zn+ CuSO4 -------> ZnSO4+Cu

Double Replacement

Look for: Ionic compounds that switch cations

Example of Double Replacement

3 AgNO3+Al I3 -------> 3AgI+Al(NO3)3

Combustion Reaction

Look for: CO2+H2O as the products

Incomplete Combustion

CO+H20

Left side of the equation

Reactants

Right Side of the equation

Products

NEVER Change Subscripts ONLY coefficiants

...

Law of Conservation of Mass

Number of Atoms on left=right

___ Rb+ __Cl2 -----> ____RbCl

2 Rb+ Cl2 -----> 2 RbCl

2 Rb+ Cl2 -----> 2 RbCl

Combination

__C2H3+___O2 -------> ___CO2+ ___H2O

2 C2H3+5 O2 ------->4 CO2+ 2 H2O

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