TYPES OF CHEMICAL REACTIONS
Section A: Fill in the Blanks
Fill in the blanks below using words/phrases from the word bank below. Words
may be used more than once.
TWO
FIVE
DECOMPOSITION
DOUBLE DISPLACEMENT
SINGLE DISPLACEMENT
ONE
There are FIVE major types of chemical reactions.
A synthesis or COMBINATION reaction occurs when two or more substances
combine to form ONE substance.
E.g. A + B → AB
A DECOMPOSITION reaction occurs when a SINGLE substance breaks down
into TWO or more substances.
E.g. AB → A + B
A SINGLE DISPLACEMENT or single replacement reaction occurs when ONE
element replaces another element in a compound.
A + BC → AC + B
A DOUBLE DISPLACEMENT or double replacement reaction occurs when the
positive ions in two compounds replace each other.
AB + CD → CB + AD
Section B: Identifying Combination and Decomposition Reactions
Balance the equations below. Indicate whether the reaction is a COMBINATION or
DECOMPOSITION reaction by writing in the appropriate word under type of
chemical reaction.
Examples are provided below:
1 H2 + 1 Cl2 → 2 HCl
Type of Chemical Reaction: Combination
2 MgO → 2 Mg + 1 O2
Type of Chemical Reaction: Decomposition
EQUATION
TYPE OF REACTION
NH3 → N2 + H2
Al + O2 → Al2O3
P2O3 → P4 + O2
K + O2 → K2O
NaNO3 → NaNO2 + O2
Si + Cl2 → SiCl4
Section C: Identifying Single and Double Displacement Reactions
Balance the equations below. Indicate the type of displacement reaction by writing
SINGLE or
DOUBLE in the space provided. Examples are provided below.
1Cu + 2 AgNO3 → 2 Ag + 1 Cu(NO3)2
1 CuSO4 + 2 NaOH → 1 Na2SO4 + 1 Cu(OH)2
Displacement
EQUATION
Cl2 + KI → KCl + I2
Reaction: Single Displacement
Reaction: Double
TYPE OF REACTION
DISPLACEMENT
K2CO3 + BaCl2 → KCl + BaCO3
Na + MgCl2 → NaCl + Mg
Al + CuCl2 → AlCl3 + Cu
DISPLACEMENT
DISPLACEMENT
DISPLACEMENT
Al + Pb(NO3)2 → Al(NO3)3 + Pb
DISPLACEMENT
AgNO3 + CaBr2 → AgBr + Ca(NO3)2
DISPLACEMENT