1. atoms chemically react to make something new
Chemical Reaction
atoms chemically react 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. Ex. Synthesis Reaction

5. 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

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

7. Ex. Decomposition Reaction

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

9. 3. Single Displacement General: AB + C  AC + B Example: Zn + CuCl2 

10. Ex. Single Replacement Reaction

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

12. 4. Double displacement General: AB + CD  AD + CB Example: MgO + CaS 

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

14. 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

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

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

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

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

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

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

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

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