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 + O 2  – Be + O 2  – SO 2 + H 2 O  – K + Br 2  – Al 2 O 3 + H 2 O 

Combination Reactions • Answers: – 2 Mg + O 2  2 MgO – 2 Be + O 2  2 BeO – SO 2 + H 2 O  H 2 SO 3 – 2 K + Br 2  2 KBr – 2 Al 2 O 3 + 6 H 2 O  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: – CaCO 3  – NaCl  – HgO  – Mg(ClO 3 ) 2  – Fe(OH) 3 

Decomposition Reactions Answers: – CaCO 3  CaO + CO 2 – 2 NaCl  2 Na + Cl 2 – 2 HgO  2 Hg + O 2 – Mg(ClO 3 ) 2  MgCl 2 + 3 O 2 – Fe(OH) 3  Fe 2 O 3 + H 2 O

Combustion Reactions • Reactions where a compound combines with oxygen to form one or more new compounds.

• General Formula: A + O 2  AO + (H 2 O) + (B)

Combustion Reactions – Try These • C 6 H 6 + O 2  • C 6 H 12 O 6 + O 2  • Na + O 2  • • P + O 2  Cu + O 2 

Combustion Reactions – Answers: • 2 C 6 H 6 + 15 O 2  12 CO 2 + 6H 2 O • C 6 H 12 O 6 + 6 O 2  6 CO 2 + 6 H 2 O • 4 Na + O 2  2 Na 2 O • 4 P + 5 O 2  2 P 2 O 5 • 2 Cu + O 2  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 + AgNO 3  – HCl + Zn  – CuBr 2 + Na  – Mg + Zn(NO 3 ) 2  – Fe 2 O 3 + H 2 

Single Replacement Reactions • Answers: – K + AgNO 3  KNO 3 + Ag – Zn + 2 HCl  ZnCl 2 + H 2 – CuBr 2 + 2 Na   2 NaBr + Cu – Mg + Zn(NO 3 ) 2  Zn + Mg(NO 3 ) 2 – Fe 2 O 3 + 3 H 2  2 Fe + 3 H 2 O

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

Double Replacement Reactions • Try These: – Pb(NO 3 ) 2 + CuSO 4  – AgMnO 4 + ZnCl 2  – NaOH + HCl  – H 2 SO 4 + Al(OH) 3  – Ba(NO 3 ) 2 + NaSO 4 

Double Replacement Reactions • Answers: – Pb(NO 3 ) 2 + CuSO 4  PbSO 4 + Cu(NO 3 ) 2 – 2 AgMnO 4 + ZnCl 2  2 AgCl + Zn(MnO 4 ) 2 – NaOH + HCl  NaCl  H 2 O – 3 H 2 SO 4 + 2 Al(OH) 3  Al 2 (SO 4 ) 3 + 6 H 2 O – Ba(NO 3 ) 2 + Na 2 SO 4  2 NaNO 3 + BaSO 4

Single Replacement Reactions • Metal reactivity series applies

Single Replacement Reactions • Try these - metal reactivity series applies – Mg + 2 AgNO 3  – 2 Li + 2 H 2 O  – Ag + KNO 3  – Mg + LiNO 3  – 3 Ca + 2 AlCl 3 

Single Replacement Reactions • Answers - metal reactivity series applies – Mg + 2 AgNO 3  Mg(NO 3 ) 2 + 2 Ag – 2 Li + 2 H 2 O  2 LiOH + H 2 – Ag + KNO 3  no reaction – Mg + LiNO 3  no reaction – 3 Ca + 2 AlCl 3  3 CaCl 2 + 2 Al

Double Replacement Reactions • Solubility Table Applies

Double Replacement Reactions • Answers - Solubility Table Applies – K 2 CO 3 + Sr(NO 3 ) 2  – NH 4 Cl + Na 3 PO 4  – HCl + ZnS  – NH 4 Cl + Pb(NO 3 ) 2  – Na 3 PO 4 + Li 2 SO 4 

Double Replacement Reactions • Answers - Solubility Table Applies – K 2 CO 3 + Sr(NO 3 ) 2  SrCO 3

↓

+ 2 KNO 3 – 3 NH 4 Cl + Na 3 PO 4  NaCl + (NH 4 ) 3 PO 4

↓

– 2 HCl + ZnS  ZnCl 2 + H 2 S

↑

– 2 NH 4 Cl + Pb(NO 3 ) 2  PbCl 2

↓

+ NH 4 NO 3 – Na 3 PO 4 + Li 2 SO 4  no reaction