Types of Chemical Reactions

Combination Reactions Reactions where two or more substances combine to form a new substance General Formula: A + B  AB

Combination Reactions Try these: Mg + O2  Be + O2  SO2 + H2O  K + Br2  Al2O3 + H2O 

Combination Reactions Answers: 2 Mg + O2  2 MgO 2 Be + O2  2 BeO SO2 + H2O H2SO3 2 K + Br2  2 KBr 2 Al2O3 + 6 H2O  4 Al(OH)3

Decomposition Reactions Reactions where a single compound breaks apart into two or more new compounds General Formula: AB  A + B

Decomposition Reactions Try these: CaCO3  NaCl  HgO  Mg(ClO3) 2  Fe(OH)3 

Decomposition Reactions Answers: CaCO3  CaO + CO2 2 NaCl  2 Na + Cl2 2 HgO  2 Hg + O2 Mg(ClO3) 2  MgCl2 + 3 O2 Fe(OH)3  Fe2O3 + H2O

Combustion Reactions Reactions where a compound combines with oxygen to form one or more new compounds. General Formula: A + O2  AO + (H2O) + (B)

Combustion Reactions Try These C6H6 + O2  C6H12O6 + O2  Na + O2  P + O2  Cu + O2 

Combustion Reactions Answers: 2 C6H6 + 15 O2  12 CO2 + 6H2O C6H12O6 + 6 O2  6 CO2 + 6 H2O 4 Na + O2  2 Na2O 4 P + 5 O2  2 P2O5 2 Cu + O2  2 CuO

Single Replacement Reactions Reactions where one element replaces a second element in a compound General Formula: A + BC  AC + B

Single Replacement Reactions Try these: K + AgNO3  HCl + Zn  CuBr2 + Na  Mg + Zn(NO3)2  Fe2O3 + H2 

Single Replacement Reactions Answers: K + AgNO3  KNO3 + Ag Zn + 2 HCl  ZnCl2 + H2 CuBr2 + 2 Na   2 NaBr + Cu Mg + Zn(NO3)2  Zn + Mg(NO3)2 Fe2O3 + 3 H2  2 Fe + 3 H2O

Double Replacement Reactions Reactions where positive ions are exchanged between compounds General Formula: AB + CD  AD + BC

Double Replacement Reactions Try These: Pb(NO3)2 + CuSO4  AgMnO4 + ZnCl2  NaOH + HCl  H2SO4 + Al(OH) 3  Ba(NO3) 2 + NaSO4 

Double Replacement Reactions Answers: Pb(NO3)2 + CuSO4  PbSO4 + Cu(NO3) 2 2 AgMnO4 + ZnCl2  2 AgCl + Zn(MnO4) 2 NaOH + HCl  NaCl  H2O 3 H2SO4 + 2 Al(OH) 3  Al2 (SO4) 3 + 6 H2O Ba(NO3) 2 + Na2SO4  2 NaNO3 + BaSO4

Single Replacement Reactions Metal reactivity series applies H from H2O H from Acids

Single Replacement Reactions Try these - metal reactivity series applies Mg + 2 AgNO3  2 Li + 2 H2O  Ag + KNO3  Mg + LiNO3  3 Ca + 2 AlCl3 

Single Replacement Reactions Answers - metal reactivity series applies Mg + 2 AgNO3  Mg(NO3)2 + 2 Ag 2 Li + 2 H2O  2 LiOH + H2 Ag + KNO3  no reaction Mg + LiNO3  no reaction 3 Ca + 2 AlCl3  3 CaCl2 + 2 Al

Double Replacement Reactions Solubility Table Applies

Double Replacement Reactions Answers - Solubility Table Applies K2CO3 + Sr(NO3)2  NH4Cl + Na3PO4  HCl + ZnS  NH4Cl + Pb(NO3)2  Na3PO4+ Li2SO4 

Double Replacement Reactions Answers - Solubility Table Applies K2CO3 + Sr(NO3)2  SrCO3↓ + 2 KNO3 3 NH4Cl + Na3PO4  NaCl + (NH4)3PO4↓ 2 HCl + ZnS  ZnCl2+ H2S ↑ 2 NH4Cl + Pb(NO3)2  PbCl2 ↓ + NH4NO3 Na3PO4+ Li2SO4  no reaction