Grade 11 Chemistry - Unit 2 Review


Lesson 1 – Chemical Equations

 

Chemical Reactions


 

 

Clues that Chemical Reaction/Change Occurred

 

Writing Chemical Formulas

 

Symbols in equations

Chemical Equation Symbols

 

Chemical Equations

 


Conservation of Mass

 

Rules for Balancing

 

1)    Assemble the correct formulas for all the reactants and products, using “+” and “→”

 

2)    Count the number of atoms of each type appearing on both sides

 

3)    Balance the elements one at a time by adding coefficients (the numbers in front) where you need more – save balancing the H and O until LAST! *Save single elements for the last

 

4)    Double-Check to make sure it is balanced by counting the atoms on both sides.

 

–      If you change the subscript (formula) you are describing a different chemical.

 

–      H2O is a different compound than H2O2

 

–      2NaCl is okay, but Na2Cl is not.

 

Pb(NO3)2+       2KI -->             PbI2 + 2KNO3

 


Types of Reactions

 

Synthesis Reactions

 

Decomposition Reactions

 

Decomposition Exceptions

 

Combustion Reactions

 

Single Displacement Reactions

 

Using the Activity Series

 

Halogen Activity Series

 

 

No Reactions

Double Displacement Reactions

 

Solubility

 

Characteristics of Combustion

 

Combustion with Hydrocarbons

 

Complete Combustion

 

Incomplete Combustion

 

Carbon Monoxide

 

Examples

 

Combustion with other Substances

 

Neutralization Reactions

 

Example


 

Example 2

 

 

 

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