8th Grade Science
T. Trimpe http://sciencespot.net/
Watch the movie and then complete the chart.
Type of Reaction
Definition
 Equation
A + B → AB
Synthesis
Two or more elements or
compounds combine to
make a more complex
substance
Decomposition
Compounds break down
into simpler substances
Single
Replacement
Occurs when one element
replaces another one in a
compound
AB + C → AC + B
Double
Replacement
Occurs when different
atoms in two different
compounds trade places
AB + CD → AC + BD
AB → A + B
A = Red B = Blue C = Green D = Yellow
Identifying Chemical Reactions
2. Use colored pencils to circle the common atoms or compounds in each equation to
help you determine the type of reaction it illustrates. Use the code below to classify
each reaction.
S = Synthesis
____ P +
D = Decomposition
SR = Single Replacement
O2 → P4O10
____ HgO → Hg +
O2
____ Cl2 + NaBr → NaCl + Br2
DR = Double Replacement
____ Mg + O2 →
MgO
____ Al2O3 → Al + O2
____ H2 + N2 → NH3
____ Na
+ Br2
→ NaBr
____ CuCl2 + H2S → CuS + HCl
____ HgO + Cl2 → HgCl + O2
____ C + H2 →
____ KClO3 →
____ S8 +
KCl +
____ BaCl2 + Na2 SO4 →
O2
NaCl + BaSO4
F2 →
CH4
SF6