Classifying Reactions
&
Predicting Products
 Synthesis
or combination
Equation : A + B  AB
Sample Equations:
N2(g) + 3H2(g)
 2NH3(g)
Predicting Products:
Metal and nonmetals react to form ionic compounds
Nonmetals form covalently bonded molecules
Compounds react to form new larger compounds
 Predicting

products example
Solid aluminum reacts with fluorine gas.
 Decomposition
Equation :
AB  A
Sample Equation:
2NH3(g)

N2(g) +
+ B
3H2(g)
Predicting Products:
Compounds decompose into elements
More complex compounds decompose into an element
and another compound
 Platinum
(IV) chloride is heated
 Other


decomposition examples
Peroxides decompose to form oxygen gas
hydrogen peroxide example:
2 H2O2 2 H2O + O2
Metal carbonates decompose to form CO2 gas and
the metal oxide
CaCO3 → CaO +CO2
However Group 1A carbonates are highly stable
and do not generally decompose
Equation : B + AX  A
Sample Equation:
CuCl2(aq) + Fe(s)
+ BX

FeCl2(aq) + Cu(s)
Predicting Products:
Cations replace other cations
Anions replace anions-Halogens
Cl2(g) + 2NaBr  2NaCl + Br2(g)
 Magnesium
chloride…
metal and aqueous aluminum
Equation in symbols: AX + BY
Sample Equation:
Pb(NO3)2(aq) + 2 KI(aq)
KNO3(aq)

 BX
+ AY
PbI2(s) + 2
Predicting Products:
*Cations switch places with other cations; note
chemical formulas must be balanced
*Precipitates are often formed (solid species)
A
solution containing sodium chloride reacts
with aqueous silver nitrate to form …
Equation: any compound + O2
Sample Equation:
 ??
2H2 + O2  2H20 + lots of heat
Predicting Products:
hydrocarbons form CO2 and H2O
CH4(g) + O2(g)  CO2(g) + H2O(g)
 Worksheets
attached
 Review balancing equations worksheet and
categorize
 Complete predicting products wkst