1. III. Types of Chemical Reactions
Ch. 10 – Chemical Reactions
III. Types of Chemical Reactions
C. Johannesson

2. CH4(g) + 2O2(g)  CO2(g) + 2H2O(g)
A. Combustion
the burning of any substance in O2 to produce heat
CxHy + O2  CO2 + H2O
CH4(g) + 2O2(g)  CO2(g) + 2H2O(g)
C. Johannesson

3. A. Combustion 4 2 Na(s)+ O2(g)  Na2O(s) C3H8(g)+ O2(g)  5 3 4
Products:
contain oxygen in reactants
hydrocarbons form CO2 + H2O
Na(s)+ O2(g) 
Na2O(s)
C3H8(g)+ O2(g) 
CO2(g)+ H2O(g)
C. Johannesson

4. B. Synthesis
the combination of 2 or more substances to form a compound
only one product
A + B  AB
C. Johannesson

5. B. Synthesis
H2(g) + Cl2(g)  2 HCl(g)
C. Johannesson

6. B. Synthesis Al(s)+ Cl2(g)  2 3 2 AlCl3(s) Products:
ionic - cancel charges
covalent - hard to tell
Al(s)+ Cl2(g) 
AlCl3(s)
C. Johannesson

7. AB  A + B C. Decomposition
a compound breaks down into 2 or more simpler substances
only one reactant
AB  A + B
C. Johannesson

8. C. Decomposition
2 H2O(l)  2 H2(g) + O2(g)
C. Johannesson

9. C. Decomposition 2 2 KBr(l)  K(s) + Br2(l) Products:
binary - break into elements
others - hard to tell (look at reference table)
KBr(l) 
K(s) + Br2(l)
C. Johannesson

10. A + BC  B + AC D. Single Replacement
one element replaces another in a compound
metal replaces metal (+)
nonmetal replaces nonmetal (-)
A + BC  B + AC
C. Johannesson

11. Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s)
D. Single Replacement
Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s)
C. Johannesson

12. D. Single Replacement Fe(s)+ CuSO4(aq)  Cu(s)+ FeSO4(aq)
Products:
metal  metal (+)
nonmetal  nonmetal (-)
free element must be more active (check activity series)
The single element must be higher on the activity series than the element it is trying to replace
Fe(s)+ CuSO4(aq) 
Cu(s)+ FeSO4(aq)
Br2(l)+ NaCl(aq) 
N.R.
C. Johannesson

13. C. Johannesson

14. AB + CD  AD + CB E. Double Replacement
ions in two compounds “change partners”
cation of one compound combines with anion of the other
AB + CD  AD + CB
C. Johannesson

15. E. Double Replacement Products: switch negative ions
one product must be insoluble (check solubility table)
C. Johannesson

16. Pb(NO3)2(aq) + K2CrO4(aq)  PbCrO4(s) + 2KNO3(aq)
E. Double Replacement
Pb(NO3)2(aq) + K2CrO4(aq)  PbCrO4(s) + 2KNO3(aq)
C. Johannesson