Classifying reactions
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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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Classifying Reactions

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Classifying reactions

Classifying Reactions

6 Subgroups


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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