1. QOTD What do you think of when you hear the word “reaction”.
Which families of elements are the most reactive?
What do you think is the end result of a chemical reaction?

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

3. Types of Reactions Synthesis reactions Double displacement reactions
Decomposition reactions
Single displacement reactions
Double displacement reactions

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

5. Ex. Synthesis Reaction

6. 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

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

8. Ex. Decomposition Reaction

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

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

11. Ex. Single Replacement Reaction

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

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

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

15. 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

16. Synthesis Decomposition Single Replacement Double Replacement
QOTD List the equations for each reaction
(ABCD equations)
Synthesis
Decomposition
Single Replacement
Double
Replacement

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

18. Which type of reaction?
Cl2 + 2NaBr  2NaCl + Br2
Single Replacement

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

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

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

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

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

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