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Objectives. To learn about classification schemes for reactions. A. Ways to Classify Reactions . Formation of a precipitate from a solution AB (aq) + CD (aq)  AD (s) + CB (aq). Double Displacement Reactions. Atoms swap partners. Precipitation Reactions. Acid-Base Reactions.

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Objectives

  • To learn about classification schemes for reactions
a ways to classify reactions
A. Ways to Classify Reactions
  • Formation of a precipitate from a solution

AB (aq) + CD (aq)  AD (s) + CB (aq)

  • Double Displacement Reactions
  • Atoms swap partners

Precipitation Reactions

Acid-Base Reactions

  • Reaction of acids and bases to give a salt plus water:
  • HX(aq) + MOH(aq)MX(aq) + H2O(l)
a ways to classify reactions1
A. Ways to Classify Reactions
  • Single Replacement Reactions
  • One atom replaces another in a compound

Thermite Reaction

Equation:

a ways to classify reactions2
A. Ways to Classify Reactions
  • Single Replacement Reactions

Equation:

  • In General: A + BC  B + AC
b other ways to classify reactions
B. Other Ways to Classify Reactions
  • Combustion Reactions
  • Involve oxygen and produce energy so rapidly that a flame results
  • CH4(g) + 2O2(g) CO2(g) + 2H2O(g)

Special class of oxidation-reduction reaction

b other ways to classify reactions1
B. Other Ways to Classify Reactions
  • Synthesis (Combination) Reactions
  • A synthesis reaction is one in which a compound forms from simpler materials (often elements)

4Fe (s) + 3O2 (g)  2Fe2O3 (s)

Special class of oxidation-reduction reactions

b other ways to classify reactions2
B. Other Ways to Classify Reactions
  • Decomposition Reactions
  • A decomposition reaction occurs when a compound is broken down into simpler substances.

2H2O(l) 2H2(g) + O2(g)

  • Also a special class of oxidation-reduction reactions

water hydrolysis

b other ways to classify reactions4
B. Other Ways to Classify Reactions
  • Summary

(WOC P276 Q50, 51)

Copy the diagram above and write the balanced equation of an example of each of the six main reaction types (also say if your example is a single replacement or double displacement reaction)