Double replacement and Single replacement reactions

1
Double replacement and Single replacement
reactions

• 1/4/07 and 1/5/07

2
Double Replacement Reactions

• AB CD ? AD CB
• Compound compound ? compound compound
• Notice on the reactants side, two compounds are
  present and on the products side, two completely
  different compounds are present
• Think FOIL from mathdo the OI portion to predict
  the products of a double replacement reaction.

3
Precipitation Reactions

• Type of double replacement
• One of the products formed is a solid, also known
  as a precipitate
• Use solubility rules to determine if a compound
  is a solid
• If compound not a solid, we use aq to represent
  that the compound is aqueous
• Ex. HCl (aq)

4
Aqueous Solution Reactions

• Still Double replacement reaction
• Molecular equation shows complete formula of
  reactants and products
• NaCl(aq) Ag(NO3)(aq) ? Na(NO3)(aq) AgCl(s)
• Complete ionic equation shows all aqueous
  solutions in their ionic form
• Na (aq) Cl- (aq) Ag (aq) NO3- (aq) ? Na
  (aq) NO3- (aq) AgCl (s)

5
Aqueous Solution Reactions Cont.

• Net ionic equation Includes only the components
  that undergo a change. Spectator ions (ions that
  do not directly participate in the reaction) are
  not included
• Ag (aq) Cl- (aq) ? AgCl (s)
• Notice the Na and NO3 ions are not included b/c
  they are spectator ions

6
Single Replacement Reactions

• AB C ? AC B or CB A
• Depends on if C is a metal or nonmetal
• If C is a metal, it will replace A if C is a
  nonmetal, it will replace B.
• Compound element ? compound element
• Ex. 2 AgNO3 Cu ? Cu(NO3)2 2 Ag
• Here a metal is being replaced
• Ex. 2 KI Cl2 2 KCl I2
• Here a nonmetal is being replaced