1. Classifying Chemical Reactions

2.  It may seem like there are many different ways that chemicals can react!
In fact, chemists have determined that are FOUR main ways that chemicals interact

3. Four main types of reactions:
Synthesis
Decomposition
Single Displacement
Double Displacement
We will also learn about
Combustion of a Hydrocarbon

4. Synthesis Reactions: A + B  AB
Two elements combine to form a compound or
two small compounds form a larger compound
Example:
2Mg + O2 2MgO

5. Decomposition Reactions:
AB  A B
A larger compound breaks down into
two elements or two smaller compounds.
Example:
2H2O  2H2 + O2

6. 1) 2H2 + O2 2H2O ____________________
Try These!! Classify each of the following reactions as synthesis or decomposition reactions.
Synthesis
1) 2H2 + O2 2H2O ____________________
Decomposition
2) Na2CO3  Na2O +CO2 _____________________
3) Hydrogen Peroxide  Water + Oxygen Gas __________________
Decomposition
4) Sodium + Chlorine gas  Sodium Chloride __________________
Synthesis

7. Single Displacement Reactions:
A + BC  AC + B
An element takes the place of another element in a compound.
Zinc has “kicked out” the hydrogen!
Example:
Zn + 2HCl  ZnCl2 + H2

8. Another way to think of this!...
One partner in a dancing couple gets “bumped out” by a stronger dancer!
Penguin “bumps out” mouse to dance with monkey!

9. Double Displacement Reactions:
AB + CD  CB + AD
Elements in different compounds switch places.
Sodium and silver have switched places!
Example:
NaCl + AgNO3  AgCl +NaNO3

10. Two dancing couples switch partners!+ +
Switch places

11. YouTube Video
Five Major Chemical Reactions

12. Try these!!: Classify each of the following reactions as single or double displacement reactions.
1) Zn + AgNO  Zn(NO3)2 + Ag _____________________
Single displacement
2) CuNO3 + KCl  KNO3 + CuCl ______________________
Double displacement
3) 2KCl + Pb(NO3)2  2KNO3 + PbCl2 ______________________
Double displacement
4) Al + Fe(NO3)  Al(NO3)3 + Fe ______________________
Single displacement

13. Combustion of a Hydrocarbon Fuel
when a fuel reacts with oxygen releasing heat
Clean combustion produces:
CARBON DIOXIDE and WATER
Example:
CH4 + O2  CO2+ 2H2O
(methane)

14. Assignment: 1) Types of Chemical Reactions Chart
2) Worksheet: Types of Chemical Reactions