Notes 13

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Notes 13 Predicting Products of Chemical
Reactions

• Sci 10 Chemistry

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How to Predict Products

• Look at the reactants and identify the type of
  reaction
• Synthesis if reactants are 2 small molecules or
  elements
• Decomposition if reactants are 1 compound
• Single displacement if reactants are 1 compound
  and 1 element
• Double displacement if reactants are 2 compounds
• Combustion if reactants are a molecule that
  contains C and H, with oxygen added (or if you
  see the words burn or combust)

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• Write the formulae for the products
• Synthesis Write a compound
• Decomposition Write 2 small molecules or
  elements
• Single Displacement Write a compound with a
  different cation or anion the leftover element
  that got booted out
• Double Displacement Write 2 different compounds
  showing the double switch up
• Combustion Write carbon dioxide water

4

• Check formulae to ensure they are written
  correctly
• i.e. ionic compounds have appropriate subscripts
  so total charge is zero
• i.e. HOFBrINCls are written as pairs
• i.e. molecular compounds have the proper
  subscripts
• Balance the equation

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Example

• Methane is combusted
• Must be combustion reaction (key word)
• CH4 O2 ? CO2 H2O
• Balance
• CH4 2O2 ? CO2 2H2O

6
Example

• Magnesium sulfur
• 2 elements so must be synthesis
• Mg S ? MgS (Mg 2, S2-, charges 0)
• Balance
• Already balanced ?

7
Example

• Copper (III) oxide
• 1 Compound so must be decomposition
• Cu2O3 ? Cu O2
• Balance
• 2Cu2O3 ? 4Cu 3O2

HOFBrINCl !!!!!
8
Example

• Magnesium zinc nitrate
• Element compound so must be single displacement
• Mg Zn(NO3)2 ? Mg(NO3)2 Zn
• Balance
• Already balanced ?

9
Example

• Sodium sulfate barium chloride
• 2 compounds so must be double displacement
• Na2SO4 BaCl2 ? NaCl BaSO4
• Balance
• Na2SO4 BaCl2 ? 2NaCl BaSO4

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Try It!

• Predict the products of the following reactions
• Iron (III) copper (I) nitrate ?
• SD Fe 3CuNO3 ? Fe(NO3)3 3Cu
• Hexane (C6H14) is completely combusted
• C 2C6H14 19O2 ? 12CO2 14H2O
• Ammonium nitrate barium hydroxide ?
• DD
• NH4NO3 Ba(OH)2 ? 2NH4OH Ba(NO3)2
• Aluminum chloride ?
• D 2AlCl3 ? 2Al 3Cl2

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To Do

• Notes 13 Practice 1