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

2. 1. Synthesis General: A + B  AB Example C + O2  + C + O2 → CO2 O O C

3. Practice 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)
Now, balance them.

4. 2. Decomposition General: AB  A + B Example: SrCl2  +
SrCl2 → Sr + Cl2
General: AB  A + B

5. Practice Predict the products. NaCl(s)  MgF2(s)  H2O(l)  2 2
Na(s) + Cl2(g)
Mg(s) + F2(g) 2 2
H2(g) + O2(g)
Now, balance them.

6. 3. Single Displacement General: AB + C  AC + B Example: Zn + CuCl2 
CuCl2 + Zn → ZnCl2 + Cu
General: AB + C  AC + B

7. Practice
Write and balance the following single replacement reaction equation:
Zn(s) HCl(aq)  2
ZnCl2(aq) + H2(g) 2
NaCl(s) + F2(g) 
Al(s)+ Cu(NO3)2(aq) 2
NaF(aq) + Cl2(g) 2 3 3
Cu(s)+ Al(NO3)3(aq) 2

8. 4. Double displacement General: AB + CD  AD + CB Example: MgO + CaS 
MgO + CaS → MgS + CaO
General: AB + CD  AD + CB

9. Double Replacement Reactions
Think about it like “foil”ing in algebra, first and last ions go together + inside ions go together
Example:
AgNO3(aq) + NaCl(s)  AgCl(s) + NaNO3(aq)
Another example:
K2SO4(aq) + Ba(NO3)2(aq)  KNO3(aq) + BaSO4(s) 2

10. Practice Predict the products. HCl(aq) + AgNO3(aq) 
CaCl2(aq) + Na3PO4(aq) 
Pb(NO3)2(aq) + BaCl2(aq) 
FeCl3(aq) + NaOH(aq) 
H2SO4(aq) + NaOH(aq) 
KOH(aq) + CuSO4(aq) 
HNO3(aq) + AgCl(aq) 3 2
Ca3(PO4)2(aq) + NaCl(aq) 6
PbCl2(aq) + Ba(NO3)2(aq) 3
Fe(OH)3(aq) + NaCl(aq) 3 2
Na2SO4(aq) + H2O(l) 2 2
K2SO4(aq) + Cu(OH)2(aq)

11. 5. Combustion Reactions In general: hydrocarbon + O2  CO2 + H2O
carbohydrate + O2  CO2 + H2O
Products are ALWAYS
carbon dioxide and water. (although incomplete burning does cause some by-products like carbon monoxide)
Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C8H18)
(ethanol, as in biodiesel, is C2H5OH)

12. Practice
Example
C5H12(g) + O2(g)  CO2(g) + H2O(l)
Write the products and balance the following combustion reaction:
C10H22(g) O2(g)  8 5 6 2 31 20 10
CO2(g) H20(l) 11 22 31 2

13. Mixed Practice State the type, predict the products & balance.
BaCl2 + H2SO4 
C6H O2 
Zn + CuSO4 
Cs + Br2 
FeCO3 
BaSO4 + HCl 2
double replacement 9 6
CO H2O 6
combustion
ZnSO4 + Cu
single replacement 2 2
CsBr
synthesis
FeO + CO2
decomposition

14. Balanced Equation with correct products
Reaction Type
Balanced Equation with correct products 1
Synthesis
4 Na + O2 → 2 Na2O 2
double displacement
3 CoCl2 + 2 Na3PO4 → Co3(PO4)2 + 6 NaCl 3
decomposition
2 Al2O3 → 4 Al + 3 O2 4
combustion
2 C2H2 + 5 O2 → 4 CO2 + 2 H2O 5
2 AgNO3 + CaCl2 → 2 AgCl + Ca(NO3)2 6
Single displacement
Zn + Pb(NO3)2 → Zn(NO3)2 + Pb 7
CuCl2 → Cu + Cl2 8
16 Al + 3 S8 → 8 Al2S3 9
F2 + 2 NaCl → 2 NaF + Cl2 10
CaI2 + Hg(NO3)2 → HgI2 + Ca(NO3)2 11
2 Al + 3 NiSO4 → Al2(SO4)3 + 3 Ni