Podcast 7.2 AThe "Basic 4" Reactions 1 The Basic 4 Synthesis or CombinationDecompositionSingle-ReplacementDouble Replacement 2 Synthesis or Combination Two or more combine to form a single compoundThere is only a single Red Flag: Usually just see elements as the reactants and only ONE productExamples:K + Cl2 Cu + S Al + Br2  3 Decomposition A single compound breaks down into two or more Opposite of Synthesis or CombinationRed Flag: There is only ONE compound as your .Examples:PbO2 HI NaCl CaCO3  5 5 types of Chemical Reaction 2. Decomposition:Jane and Bob have “issues”Jane and Bob break upex. The electrolysis of water to make oxygen and hydrogen gas:2 H2O  2 H2 + O2 6 Single-Replacement Atoms of one element replacement atoms of a second element in a Red Flag: A Single Element is with a CompoundSometimes they work, and sometimes there is no reaction!Have to use Activity Series of Metals to find out! Metals that are reactive replace metals that are reactiveFor Nonmetals it is based on their location on the periodic table (Reactivity decreases as you move down) 7 5 types of Chemical Reaction 3. Single Replacement:Jane and Bob are dating. ex: Aluminum replaces Zinc in Zinc (II) chloride to make Aluminum chloride and Zinc: Al + ZnCl2  Zn + AlCl3 Steve steals Jane from Bob, leaving Bob alone 8 Single Replacement - Continued Examples:Mg + Zn(NO3)2 Mg + LiNO3 Cl2 + NaBr Br2 + BeF2 K + AlPO4  9 Double Replacement An exchange of positive between two reacting compoundsRed Flag: Two compounds are the One of three conditions must be met as the products are formed:One must be a precipitate ( formed) or…One must be a gas or…One must be a molecular compound (usually liquid)Examples:HCl + NaOH BaCl2 + K2CO3  10 Single Replacement - Continued Examples:Mg + Zn(NO3)2 Mg + LiNO3 Cl2 + NaBr Br2 + BeF2 K + AlPO4  9 Double Replacement An exchange of positive between two reacting compoundsRed Flag: Two compounds are the One of three conditions must be met as the products are formed:One must be a precipitate ( formed) or…One must be a gas or…One must be a molecular compound (usually liquid)Examples:HCl + NaOH BaCl2 + K2CO3  10 5 types of Chemical Reaction 4. Double Replacement:Jane and Bob are datingSteve and Marcie are datingThey break up and swap partnersex: Reaction of lead nitrate with potassium iodide to form lead iodide and potassium nitrate: Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3 11 Identifying Reaction Types Identify what type the following reactions are: NaOH + KNO3  NaNO3 + KOH CH4 + 2 O2  CO2 + 2 H2O 2 Fe + 6 NaBr  2 FeBr3 + 6 Na CaSO4 + Mg(OH)2  Ca(OH)2 + MgSO4 Pb + O2  PbO2 Na2CO3  Na2O + CO2 12 Warm Up Identify Reaction Types + Balance Al + HCl  AlCl3 + H2KClO3  KCl + O2Pb(NO3)2 + KI  PbI2 + KNO3 Single Replacement2Al + 6HCl  2AlCl3 + 3H2 Decomposition2KClO3  2KCl + 3O2 Double ReplacementPb(NO3)2 + 2KI  PbI2 + 2KNO3 13