Types of Reactions

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Types of Reactions
Lets Piece It Together
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Types of Chemical Reactions

• Combustion Burning elements/compounds
• Synthesis To Make ONE compounds
• Decomposition To Break-down one compound into
  two or more substances
• Single Displacement/Replacement to move one
  element and replace another
• Double Displacement/Replacement to move two
  elements and replace others

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Combustion (AKA Burning)

• a reaction in which oxygen combines with another
  compound (called a hydrocarbon) to form carbon
  dioxide and water.
• Example Burning of candle wax/paraffin
• C25H52 38 O2 ? 25 CO2 26 H2O

hydrocarbon called paraffin
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Synthesis make 1 product

• Only ONE PRODUCT is MADE
• General Form A B ? AB
• Example An iron nail rusting.
• 4 Fe 3 O2 ? 2 Fe2O3

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Decomposition break down 1 reactant

• Only ONE REACTANT TO START WITH
• General form
• compound ? element element OR
• compound ? element compound
• Example Electrolysis of water
• 2 H2O ? 2 H2 O2

animation
compound
elem.
elem.
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Single Displacement/Replacement 1 element moves
another

• a reaction in which a single element trades
  places with another element in a compound.
• General Form
• element compound ? element compound
• 2 K MgCl2 ? Mg 2 KCl

compound
element
compound
element
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Double Displacement/Replacement two elements
switch places

• A reaction in which the cation of one compound
  switches places with the anions of the other
  compound.
• General Form
• Compound Compound ? Compound Compound
• Example
• Pb(NO3)2 2 KI ? PbI2 2 KNO3

compound
compound
compound
compound
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A Handy ChecklistWhat Type of Reaction Is It?

• 1)  Does your reaction have oxygen as one of its
  reactants and carbon dioxide and water as
  products? If yes, then it's a ________ reaction.
• 2)  Does your reaction have one compound on the
  product side? If yes, then it's a ________
  reaction.

combustion
synthesis
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What type of reaction is it?

• Does your reaction have one large compound on the
  reactant side falling apart to make several small
  ones on the product side? If yes, then it's a
  ____________ reaction.
• Does your reaction have one element on both sides
  of the arrow? If yes, then it's a
  ________________ reaction.
• Does your reaction have two compounds on both
  sides of the arrow? If yes, then its a
  _________________ reaction

decomposition
single displacement
double displacement
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Identify the Type of Reaction

• 1 NaOH 1 KNO3 ? 1 NaNO3 1 KOH
• 1 CH4 2 O2 ? 1 CO2 2 H2O
• 1 Fe 3 NaBr ? 1 FeBr3 3 Na
• 2 Pb 1 O2 ? 2 PbO
• 1 Na2CO3 ? 1 Na2O 1 CO2

Double displacement two compounds on either side
Combustion oxygen and CO2 and H2O
Single displacement one element displaces
another
Synthesis making one compound
Decomposition breaking down one compound
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