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CHEM 1011

CHEM 1011. Classes of Chemical Reactions. Safety. Put on Goggles And Apron. Chemical Reaction. Reactants → Products Products’ characteristics and properties differ from reactants’. Four Reaction Types. Combination Decomposition Single Replacement (Substitution)

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CHEM 1011

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  1. CHEM 1011 Classes of Chemical Reactions

  2. Safety Put on Goggles And Apron

  3. Chemical Reaction Reactants → Products • Products’ characteristics and properties differ from reactants’

  4. Four Reaction Types • Combination • Decomposition • Single Replacement (Substitution) • Double Replacement (Metathesis)

  5. Combination Reactions • Two elements react to form a compound A + B → AB e.g., 2Na (s) + Cl2 (g) → 2NaCl (s)

  6. Decomposition Reactions • Compound breaks down into simpler elements or compounds AB → A + B e.g., 2HgO (s) → 2Hg (l) + O2 (g)

  7. Single Replacement (Substitution) • Replacement of one component in a compound by another AB + C → CB + A e.g, Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu(NO3)2 (aq) 2Mg + CO2 → 2MgO + C

  8. Activity Series Activity

  9. Single Replacement (Substitution) • Refer to Activity Series Chart to dictate substitution • Elements cannot replace anything above them • Cu (s) + AlCl3 (aq) → No Reaction

  10. Single Replacement (Substitution) • Hydrogen can be replaced by a very active metal. e.g., Zn (s) +2HCl (aq) → ZnCl2 (aq) + H2 (g)

  11. Double Replacement Reactions • Two compounds react to form two different compounds AB +CD → AD + CB e.g., FeCl3 (aq)+ 3NaOH (aq) → 3NaCl (s) + Fe(OH)3 (aq)

  12. Conclusions • Observe energy and physical changes • Balance all equations resulting in a reaction • Make sure to use your activity series chart when determining if reactions occur or not

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