Download Ch. 8 Types of Chemical Reactions

Ch. 8 – Chemical Reactions
Types of Chemical
Reactions
I
II III IV V
Describing Chemical Reactions

Evidence of a chemical change…
 Production of heat and light
 Formation of a gas
 Formation of a precipitate, a solid
product.
 Color change
Describing Chemical Reactions
A+B  AB
REACTANTS
PRODUCTS
Describing Chemical Reactions
A. Combination / Synthesis
(marriage)

the combination of 2 or more
substances to form a compound

only one product
A + B  AB
A. Combination / Synthesis

Product:
 Must be a compound
Mg(s) + O2(g)  MgO(s)
B. Decomposition (divorce)

a compound breaks down into 2 or
more simpler substances

only one reactant
AB  A + B
B. Decomposition

Products:
 Can be elements or compounds
H2O2 (aq)  H2O(l) + O2(g)
C. Single Replacement (affair)



one element replaces another in a
compound
Metal replaces metal
Nonmetal replaces nonmetal
A + BC  B + AC
C. Single Replacement
Zn(s) + HCl(aq)  H2(g) + ZnCl2(aq)
D. Double Replacement (Jerry
Springer)
ions in two compounds “change
partners”
 cation of one compound combines
with anion of the other

AB + CD  AD + CB
D. Double Replacement

Products:
 Are compounds
 Sometimes one of the products is water
Pb(NO3)2(aq)+ NaI(aq)  PbI2(s)+ NaNO3(aq)
E. Combustion

the burning of a hydrocarbon to
produce heat
CxHy + O2  CO2 + H2O
E. Combustion


Products:
During complete combustion the
products are CO2 + H2O
C12H22O11 + 3O2  9C + 3CO2 + H2O
Warm up (practice)
Title: Reaction Types
Number Page (1-5)
1.
2.
3.
4.
5.
1. Single Replacement
Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s)
2. Decomposition
2 H2O(l)  2 H2(g) + O2(g)
3. Combination / Synthesis
H2(g) + Cl2(g)  2 HCl(g)
4. Double Replacement
Pb(NO3)2(aq) + K2CrO4(aq)  PbCrO4(s) + 2KNO3(aq)
5. Combustion
C2H6 + O2  CO2 + H2O