1. Unit 2-4: Rearrangement of Atoms in Chemical Reactions

2. Types of Chemical Reactions
All chemical reactions follow the same basic formula:
Reactants  Products

3. In grade 9 you learned that:
If energy is required for a reaction to occur:
Reactants + energy  Products
- Then the reaction is classified as ENDOTHERMIC
If energy is released or produced during a reaction:
Reactants  Products + energy
- Then the reaction is classified as EXOTHERMIC

4. Reactions can be further classified based on HOW the reactants combine and HOW the products form
There are 6 common types of reactions that you need to be able to identify!

5. Classification of Chemical Reactions: The Soap-Opera of Chemistry

6. 6 Main types of reactions
Synthesis- “Love at first sight”
Decomposition- “The big break-up”
Single Replacement- “My best friends girlfriend”
Double Replacement- “Revenge”
 Also, Neutralization
Combustion- “The player”

7. Synthesis- “Love at first sight”
I like your braces
I like your hat
Hey Sally
Can I get your number
Hey Harry
Basic equation: A+B AB

8. Synthesis- “Love at first sight”
Two individual elements combine to produce a compound.
Example: 2 Na + Cl2  2 NaCl

9. Practice:
Mg N2 

10. Practice:
Al F2 

11. Practice:
K O2 

12. Practice:
Cd I2 

13. Practice:
Cs P4 

14. Decomposition- “The Big Break-up”
Whatever
I was washing my hair
Im leaving
We are Through
Where were you last night
But, baby I love you
I don’t believe you
Basic Equation: AB A+B

15. Decomposition- “The Big Break-up”
I am so over you
The Breakdown of a compound into elements
Example: 2 H2O  2 H2 + O2

16. Practice:
AuCl3 

17. Practice:
K2O 

18. Practice:
MgF2 

19. Practice:
Ca3N2 

20. Practice:
CsI 

21. Single Replacement- “My Best Friends Girlfriend”
Hey, Baby. How you doing?
This Stinks!
Hey Mark, here comes your friend Pierre
Man, Marks Girl is pretty Hot!
Oh Pierre! Mark Im leaving you
Basic Eqn: AB + C  AC + B
Or AB + C  CB + A

22. Single Replacement- “My Best Friends Girlfriend”
“Free” element must be the more reactive element for a reaction to occur ( Pierre is more suave then Mark)
Basically, a compound and element react to produce a different compound and element
Example: 2K + 2HCl  2KCl + H2

23. Practice:
PbCl Al 

24. Practice:
Na Cu2O 

25. Practice:
CuF Mg 

26. Practice:
Cl CsBr 

27. Practice:
Be Fe(NO3)2 

28. Double Replacement- “Revenge”
I have to get Pierre back. Hey Chloe do you want to go out
I can’t believe Chloe would do that Ok
Pierre, Im sick of you
Chloe was my one true love, but Marks girl is looking pretty Hot.
Basic Eqn: AB + CD  AD +BC

29. Double Replacement- “Revenge”
Two compounds react to produce two different compounds.
Ex: 2 KI(aq) + Pb(NO3)2(aq)  PbI2(s) + 2 KNO3(aq)

30. Practice:
CaS NaOH 

31. Practice:
K3PO MgI2 

32. Practice:
SrCl Pb(NO3)2 

33. Practice:
AlCl CuNO3 

34. Practice:
AgNO Na2CrO4 

35. ACID + BASE  SALT + WATER
Psst….
Neutralization Reactions are a specific type of Double Replacement Reaction!!
ACID + BASE  SALT + WATER
H2SO4 + Ca(OH)2 → CaSO4 + 2H2O
Acid Base Salt Water

36. Practice:
HBr NaOH 

37. Practice:
H3PO Mg(OH)2 

38. Practice:
HCl Pb(OH)2 

39. Practice:
Al(OH) HClO4 

40. Combustion- “The player”
That was a great date
Baby, I love you
Ashley you’re my BFF
Hey Ladies
(3 weeks later)
Basic Eqn:
CxHy + O2  CO2 + H2O

41. Combustion- “The player”
Honey, Why is Ashley’s number on your phone?
A hydrocarbon reacts with oxygen to produce carbon dioxide,water and energy (very exothermic!)

42. Practice:
C3H O2 

43. Practice:
C4H O2 

44. Practice:
C2H O2 

45. Practice:
C6H12O O2 

46. Practice:
C12H22O O2 

47. Practice!
Identify each of the following as one of the 6 major types of reactions:
PbO2 → Pb + O2

48. Practice! Mg + AgNO3 → Mg(NO3)2 + Ag
Identify each of the following as one of the 6 major types of reactions:
Mg + AgNO3 → Mg(NO3)2 + Ag

49. Practice!
Identify each of the following as one of the 6 major types of reactions:
H2 + Cl2 → 2HCl

50. Practice!
Identify each of the following as one of the 6 major types of reactions:
2NaI + F2 → 2NaF + I2

51. Practice!
Identify each of the following as one of the 6 major types of reactions:
C12H22O O2 → 12CO2 + 11H2O

52. Practice!
Identify each of the following as one of the 6 major types of reactions:
2HI → H2 + I2

53. Practice! 2LiCl + Br2 → 2LiBr + Cl2
Identify each of the following as one of the 6 major types of reactions:
2LiCl + Br2 → 2LiBr + Cl2

54. Practice! H2SO4 + 2NaOH → Na2SO4 + 2H2O
Identify each of the following as one of the 6 major types of reactions:
H2SO4 + 2NaOH → Na2SO4 + 2H2O

55. Practice! Silver + chlorine → silver chloride
Identify each of the following as one of the 6 major types of reactions:
Silver + chlorine → silver chloride

56. Practice! Sulfur dioxide → sulfur + oxygen
Identify each of the following as one of the 6 major types of reactions:
Sulfur dioxide → sulfur + oxygen

57. Practice Problems Page 265 Check Your Understanding Page 271 #1-6

58. Answers to CYU pg.271 a) Neutralization b) Synthesis
c) Double replacement
d) Synthesis
e) Combustion
f) Double replacement
g) Single replacement (metal)
h) Neutralization
i) Decomposition
j) Single replacement (metal)

59. Answers to CYU pg.271
2. Combustion reactions will always have O2 as one of the reactants. 3. 1a of these questions is both a neutralization and a double replacement reaction. 4. a) Synthesis: 4Na + O2  2Na2O b) Double Replacement: Na2SO4 + CaCl2  2NaCl + CaSO4

60. Answers to CYU pg.271
4. c) Combustion: C3H8 + 5O2  3CO2 + 4H2O d) Neutralization: H2SO4 + 2KOH  K2SO4 + 2H2O e) Decomposition: 2AlCl3  2Al + 3Cl2 f) Single Replacement: 3Cd + 2Au(NO3)3  3Cd(NO3)2 + 2Au

61. Answers to CYU pg.271
4. g) Double replacement: Sr(OH)2 + PbBr2  SrBr2 + Pb(OH)2 h) Combustion: C6H12O6 + 6O2  6CO2 + 6H2O i) Synthesis: 2N2 + 3O2  2N2O3 j) Single replacement: 2HNO3 + Zn  Zn(NO3)2 + H2

62. Answers to CYU pg.271
5. a) Synthesis: 6Na + N2  2Na3N b) Decomposition: 2AlF3  2Al + 3F2 c) Single Replacement: 3CuSO4 + 2Al  Al2(SO4)3 + 3Cu d) Double Replacement: CaI2 + Pb(NO3)2  Ca(NO3)2 + PbI2

63. Answers to CYU pg.271
5. e) Combustion: 2C4H O2  8CO2 + 10H2O f) Double replacement: AgNO3 + NaBr  AgBr + NaNO3 g) Single replacement (non-metal): 2CsI + Cl2  2CsCl + I2 h) Neutralization: HCl + NaOH  NaCl + H2O

64. Answers to CYU pg.271
5. i) Double replacement: K2Cr2O7 + 2AgNO3  Ag2Cr2O7 + 2KNO3 j) Combustion: C5H10O5 + 5O2  5CO2 + 5H2O 6. 2Fe + 3Cl2  2FeCl3