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Classifying Reactions. 6 Subgroups. Formation (Synthesis) Reactions (F). Element + Element  Compound E + E  C Examples: Hydrogen and oxygen combine to form water. Carbon and hydrogen combine to form methane. Zn + S 8  ZnS Cl 2 + Na  NaCl Hg + O 2  HgO.

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formation synthesis reactions f
Formation (Synthesis) Reactions (F)

Element + Element  Compound

  • E + E  C
  • Examples:
    • Hydrogen and oxygen combine to form water.
    • Carbon and hydrogen combine to form methane.
  • Zn + S8  ZnS
  • Cl2 + Na  NaCl
  • Hg + O2  HgO
decomposition reactions d
Decomposition Reactions (D)

Compound  Element +Element

  • C  E + E
  • Examples:
    • Water is broken down into hydrogen and oxygen.
    • Sodium chloride is broken down into sodium and chlorine.
  • Fe2S3  Fe + S8
  • H2O  H2 + O2
  • MgCl2  Mg + Cl2
single replacement reactions sr
Single Replacement Reactions (SR)

Element + Compound  Compound + Element

  • E + C  C + E (same as C + E  E + C, etc.)
  • Metals change places; like a dance!
  • *Use charges to ensure proper rearrangement!!
sr examples
SR Examples
  • I2 + SnCl2  SnI2 + Cl2
  • Cu + AgNO3  Cu(NO3)2 + Ag
  • NaI + Cl2  I2 + NaCl
  • Al + HOH  Al(OH)3 + H2 (Note: HOH = H2O)
double replacement reactions dr
Double Replacement Reactions (DR)

Compound + Compound  Compound + Compound

  • C + C  C + C
  • Like 2 couples dancing and each switching partners (metals switch).
  • Use charges for proper rearranging.
dr examples
DR Examples
  • HCl + NaOH  NaCl + H2O (ie. HOH)
  • AgNO3 + NaCl  NaNO3 + AgCl
combustion reactions c
Combustion Reactions (C)

Fuel + O2 CO2 + H2O

  • Fuels usually contain H, C and sometimes O
  • C3H8 + O2  CO2 + H2O
  • CH4 + O2  CO2 + H2O
  • CH3OH + O2  CO2 + H2O
other reactions o
Other Reactions (O)

Any reactions that don’t fit the previous 5 patterns is classed as “other”.

  • CaCO3 CO2 + CaO (ie. C  C + C)
  • CS2 + Cl2  CCl4 + S2Cl2
  • SiO2 + Na2CO3  Na2SiO3 + CO2
classify the following reactions
Classify the following reactions:
  • 1. Na + HOH  NaOH + H2
  • 2. Al + O2  Al2O3
  • 3. C2H5OH + O2  CO2 + H2O
  • 4. Ca(NO3)2 + Na2SO4  NaNO3 + CaSO4
  • 5. AlBr3  Al + Br2
  • 6. PCl3 + H2O  H3PO4 + HCl
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