1. Learning Objectives To check our understanding of balanced equations
To recognize four of five types of chemical reactions

2. Types of Chemical Reactions
Chemists classify reactions to make it easier to predict the products of reactions.

3. Synthesis Reactions Decomposition Reactions Combustion Reactions
Types of Chemical
Reactions
Double Displacement
Reactions
Single Displacement
Reactions

4. 1. Synthesis Reactions (getting together)
In a synthesis reaction, two or more reactants combine to produce one new product as follows:
X + Y XY

5. X + Y XY X + Y XY 1. Synthesis Reactions
The following are examples of Synthesis Reactions:
Hydrogen + Oxygen  Water
X + Y XY
Chlorine + Sodium  Sodium Chloride
X + Y XY

6. X + Y XY X + Y XY X + Y XY 1. Synthesis Reactions
Aluminum + Oxygen  Aluminum Oxide
X + Y XY
Iron + Oxygen  Iron (II) Oxide
X + Y XY
e. Zinc + Oxygen  Zinc (II) Oxide
X + Y XY

7. Predict the products in each of the following:
Magnesium + Bromine 
Magnesium Bromide
Calcium + Carbon 
Calcium Carbide
Beryllium + Oxygen 
Beryllium Oxide

8. 2. Decomposition Reactions (breaking up)
In a decomposition reaction, a compound breaks down into two or more simpler compounds or elements. XY
X + Y

9. 2. Decomposition Reactions
The following are examples of Decomposition Reactions:
Water  Hydrogen + Oxygen XY
X + Y
Potassium Carbonate  Potassium oxide + carbon dioxide XY
X + Y

10. Predict the products in each of the following:
Aluminum Chloride 
Aluminum + Chlorine
Sodium Bromide
Sodium + Bromine
Sodium Nitride 
Sodium + Nitrogen

11. 3. Single Displacement Reactions (cheating)
In a single displacement reaction, one element takes the place of another element in a compound.
X + YZ
Y + XZ

12. The following are examples of Single Displacement Reactions:
Magnesium + Copper (II) Sulfate
Copper + Magnesium Sulfate
Copper + Silver (I) Nitrate 
Silver + Copper (I) Nitrate
Zinc + Hydrogen Chloride 
Hydrogen + Zinc (I) Chloride

13. The Activity Series Pb + Mg(NO3)2  no reactionK Na Li Ca Mg Al Zn Fe Ni Sn Pb H Cu Hg Ag Au
The Activity Series
Only elements higher on the
activity series (ie more reactive)
are able to displace elements
lower on the activity series.
Eg.
Mg + Pb(NO3)2  Pb + Mg(NO3)2
Pb + Mg(NO3)2  no reaction

14. Predict the products in each of the following:
Aluminum + Magnesium Nitrate 
No Reaction
Calcium + Lead (II) Phosphate 
Lead + Calcium Phosphate
Iron + Hydrogen Sulfate 
Hydrogen + Iron (II) Sulfate

15. 4. Double Displacement Reactions (swinging)
In a double displacement reaction, the cations in two different compounds exchange places, forming two new compounds.
WX + YZ
WZ + YX

16. The following are examples of Double Displacement Reactions:
Switch Cations
Lead (II) Nitrate + Potassium Iodide 
Potassium Nitrate + Lead (II) Iodide
Switch Cations
Calcium sulfate + magnesium carbonate 
magnesium sulfate + calcium carbonate

17. Predict the products in each of the following:
Sodium sulfate + barium nitrate 
Aluminum phosphate + magnesium carbonate 

18. Classwork / Homework Worksheet Page 239 # 2, 3, 4 Page 243 # 3, 4
H + OH HOH (H2O)