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Types of Chemical Reactions

Types of Chemical Reactions. Addition or Synthesis Reactions. The formation of a compound from elements or simpler compounds Follows the pattern A + B → AB 2H 2 + O 2 → 2H 2 O Accompanied by a release of energy 2H 2 + O 2 → 2H 2 O + energy. Decomposition Reactions.

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Types of Chemical Reactions

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  1. Types of Chemical Reactions

  2. Addition or Synthesis Reactions • The formation of a compound from elements or simpler compounds • Follows the pattern A + B → AB • 2H2 + O2 → 2H2O • Accompanied by a release of energy • 2H2 + O2 → 2H2O + energy

  3. Decomposition Reactions • Opposite of synthesis reactions • Pattern: AB → A + B • 2H2O → 2H2 + O2 • Usually requires input of energy to proceed • 2H2O + energy → 2H2 + O2

  4. Single Replacement Reactions • Involves the “switching” of one component of a compound with another single element • Pattern: A + BC →AC + B • Zn + 2HCl → ZnCl2 + H2 • Energy is released • Zn + 2HCl → ZnCl2 + H2 + energy

  5. Double Replacement Reactions • Involves the “switching” of components of two compounds involved in a reaction. • Pattern: AB + CD → CB + AD • HCl + NaOH → NaCl + HOH (aka H2O) • Energy is usually released in these reactions • HCl + NaOH → NaCl + HOH (aka H2O) + energy

  6. Combustion Reactions • Involves the burning or rapid oxidation of compounds with oxygen • CH4 + 2O2 → CO2 + 2H2O • Look for the O2 on the reactant side • Look for CO2 and H2O on product side

  7. Phase designations • Use the following designations to indicate state or phase of each reactant and product • (g) = gas • (l) = liquid • (s) = solid • (aq) = aqueous solution (used in ionic equations)

  8. Assignment • Worksheet on equations • Prepare for Types of Reactions Lab

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