1. parts are mixed together to make something new
Chemical Reaction
parts are mixed together to make something new

2. Types of Reactions You need to be able to identify each type.
Synthesis reactions
Decomposition reactions
Single displacement reactions
Double displacement reactions
You need to be able to identify each type.

3. 1. Synthesis
Example C + O2 O C +  O C
General: A + B  AB

4. Synthesis = join together
Predict the products.
Na(s) + Cl2(g) 
Mg(s) + F2(g) 
Al(s) + F2(g)  2 2
NaCl(s)
MgF2(s) 2 3 2
AlF3(s)
Synthesis = join together

5. 2. Decomposition
Example: NaCl  Cl Na Cl + Na
General: AB  A + B

6. Decomposition = split apart
Predict the products.
HgO 
2KClO3  2
Hg2 + O2
2KCl + 3O2
Decomposition = split apart

7. 3. Single Replacement General: AB + C  AC + B Example: Zn + CuCl2  +

8. Single Replacement Reactions
Predict the products.
Cl2 + 2NaBr 
2NaCl + Br2 C A B A C B
2HgO + Cl2 
2HgCl + O2

9. 4. Double Replacement General: AB + CD  AD + CB Example: MgO + CaS 

10. Single Replacement Reactions
Predict the products.
CuCl2 + H2S 
CuS + 2HCl
BaCl2 + Na2SO4 
2NaCl + BaSO4

11. Synthesis Decomposition Single Replacement Double Replacement
join together
A + B  AB
split apart
AB  A + B
Single Replacement
Double
Replacement
trade 1 place
AB + C  AC + B
trade 2 places
AB + CD  AC + BD

12. Which type of reaction?
4 P + 5 O2  P4O10
Synthesis

13. Which type of reaction?
Cl2 + 2NaBr  2NaCl + O2
Single Replacement

14. Double Replacement Which type of reaction?
BaCl2 + Na2SO4 2NaCl + BaSO4
Double
Replacement

15. Which type of reaction?
2 HgO + Cl2 2HgCl + O2
Single Replacement

16. Which type of reaction?
2 Al2O3  4 Al + 3 O2
Decomposition

17. Which type of reaction?
CuCl2 + H2S  CuS + 2HCl
Double
Replacement

18. Which type of reaction?
3 H2 + N2  2 NH3
Synthesis

19. Which type of reaction?
2 HgO  2Hg + O2
Decomposition