1. Ms. Cook Mrs. Clark-Grubb Mrs. Mansberger
Types of Reactions
Ms. Cook
Mrs. Clark-Grubb
Mrs. Mansberger

2. Type of Reactions
Chemical reactions are classified into five general types
Synthesis (Combination)
Decomposition
Single Replacement
Double Replacement
Combustion

3. Combination (Synthesis)
Two or more elements or simple compounds combine to form (synthesize) one product
A B AB
2Mg + O2 2MgO
2Na + Cl2 2NaCl
SO3 + H2O H2SO4

4. Decomposition
One substance is broken down (split) into two or more simpler substances.
AB A B
2HgO Hg O2
2KClO KCl O2

5. Try this with your partner. . .
Classify the following reactions as
a) synthesis or b) decomposition: a
___A. H2 + Br HBr
___B. Al2(CO3) Al2O3 + 3CO2
___C. 4 Al + 3C Al4C3 b a

6. Single Replacement
One element takes the place of an element in a reacting compound.
A + BX AX B
C + BX BC X
Fe CuSO FeSO4 + Cu I ZnCl Znl Cl2

7. Double Replacement Two elements in different reactants switch places.
AX + BY AY + BX
AgNO3 + NaCl AgCl + NaNO3
ZnS + 2HCl ZnCl2 + H2S

8. Try this with your partner. . .
Classify the following reactions as
a) single replacement
b) double replacement
__A. 2Al + 3H2SO Al2(SO4) H2
__B. Na2SO4 + 2AgNO Ag2SO4 + 2NaNO3
__C. 3C + Fe2O Fe CO a b a

9. Combustion
A reaction in which a compound (often containing carbon) reacts with oxygen
2Mg + O MgO
CH4 + 2O CO H2O
C3H O CO2 + 4H2O
C6H12O6 + 6O CO2 + 6H2O

10. Try this with your partner. . .
Balance the combustion equation
___C5H ___O ___CO2 + ___H2O 8 5 6