Types of Chemical Reactions

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Types of Chemical Reactions
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Terminology

• Letters g, l, s used to show what state of matter
  the reactants or products are in
• Letters enclosed in parentheses
• If reaction occurs in solution, aq is used
  (aqueous)

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Example

• CH4 (g) O2 (g) CO2 (g) H2O (l)

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And it means

• Methane (gas) reacts with oxygen (gas) to form
  carbon dioxide (gas) and water (liquid)

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Classifying Reactions

• Synthesis
• Decomposition
• Single-replacement (or displacement)
• Double-replacement (or displacement)
• Combustion

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Synthesis

• A B AB
• Single type of product for this reaction
• Na Cl2 NaCl

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Decomposition

• AB A B
• Single compound broken down (decomposed) into 2
  or more elements or smaller compounds

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Decomposition

• H2O (l) H2 (g) O2 (g)
• The main characteristic of this is a single
  reactant and 2 or more products
• And another

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Single-replacement

• One element displaces another element that is
  part of a compound
• A BX AX B

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Single-replacement

• Mg CuSO4 MgSO4 Cu
• AX and BX are ionic compounds and A and B are
  elements
• Different example of single replacement reactions

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Double-replacement

• AX BY AY BX
• CaCO3 HCl CaCl2 H2CO3
• Animated precipitation reaction

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Combustion

• CH4 (g) O2 (g) CO2 (g) H2O (l)
• An organic compound (containing only C, H or O)
  yields carbon dioxide and water

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To recap

• Animated explanation
• And just for fun
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