1. Identifying
Chemical Reactions

2. Types of Reactions synthesis (S) decomposition (D)
single replacement (SR)
double replacement (DR)
combustion (C)

3. Synthesis format: A + B  C identifying feature: 1 product only
[A & B: elements &/or compounds, C: compound]
2 Fe(s) Cl2(g)  2 FeCl3(s)
CaO(s) + H2O(l)  Ca(OH)2(s)

4. Decomposition format: AB  A + B identifying feature: 1 reactant only
[AB: compound, A & B: elements &/or compounds]
2 NaN3(s)  2 Na(s) N2(g)
NH4NO3(s)  N2O(g) H2O(g)

5. Single Replacement format: A + BX  AX + B
identifying feature: single element + compound 
different element + different compound
2 Li(s) H2O(l)  2 LiOH(aq) + H2(g)
Cu(s) + 2AgNO3(aq)  2Ag(s) + Cu(NO3)2(aq)

6. Double Replacement format: AX + BY  AY + BX
Double Replacement
format: AX + BY  AY + BX
identifying feature: 2 cmpds form 2 new cmpds
Ca(OH)2(aq) + 2HCl(aq)  CaCl2(aq) + 2 H2O(l)
2 NaOH(aq) + CuCl2(aq)  2 NaCl(aq) + Cu(OH)2(s)

7. Combustion (reaction with O2)
format: A + O2  B ( + C + …)
identifying feature:
O2 is reactant AND 2 or more products formed
CH4(g) O2(g)  CO2(g) H2O(g)

8. Regents Board says synthesis TOPS combustion
Note:
Regents Board says synthesis TOPS combustion
2 H2(g) + O2(g)  2 H2O(g)
C(s) + O2(g)  CO2(g)
synthesis rxns
NOT
combustion rxns

9. Identify the Reaction Type
CaO + CO2  CaCO3
2 H2O  2 H2 + O2
NaOH + HCl  NaCl + H2O
Zn HCl  ZnCl2 + H2
2 Mg + O2  2 MgO
Mg + H2SO4  MgSO4 + H2
2 KClO3  2 KCl O2
AgNO3 + NaCl  NaNO3 + AgCl
synthesis
decomposition DR SR
synthesis SR
decomposition DR

10. Stoichiometry!!! What comes next?
Learn to use balanced chemical equations to predict amount of given reactant or product under certain conditions