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Single Replacement Reactions

Single Replacement Reactions. Experiment #9. Single Replacement Reactions. Oxidation reduction or Redox reactions Electron transfer reactions A + BX  B + AX Element A loses electrons to element B A + B +?  A +? + B A  A +? + ? electrons B +? + ? electrons  B.

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Single Replacement Reactions

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  1. Single Replacement Reactions Experiment #9

  2. Single Replacement Reactions • Oxidation reduction or Redox reactions • Electron transfer reactions • A + BX  B + AX • Element A loses electrons to element B • A + B+?  A+? + B • A  A+? + ? electrons • B+? + ? electrons  B

  3. Experiment • Add sodium metal to water • What happens?? • Na + H2O  • Which is more active Na or H?

  4. Experiment • Add potassium metal to water • What happens?? • K + H2O  • Which is more active K or H? • Which do you predict is more active K or Na?

  5. Develop a combined activity series • Na > H • K > H • K > Na • Can you put these all together to get an overall activity series?

  6. More experiments • Cr + NaCl  NR • Which is more active Na or Cr? • Cr + HCl  CrCl2 + H2 • Which is more active Cr or H? • Ni + HCl  NiCl2 + H2 • Which is more active Ni or H? • Cr + KCl  NR • Which is more active K or Cr?

  7. In summary • K > Na > H • Na > Cr • Cr > H • Ni > H • K > Cr • Can you determine an overall activity series? • Is there any element that you can not place? Why?

  8. Today’s experiment • In today’s experiment you are going to do 6 experiments to determine an activity series. • The formation of a precipitate or the production of bubbles indicates a reaction. • Determine the relative activities of each pair of metals/hydrogen and use these to determine the activity series • You may need to sand some of the metal pieces to get a good surface for reacting • Only metals reacting with acids will produce a gas. Any other gases produced in this lab are a side reaction.

  9. Due today • Experiment 10 – Double Displacement Reactions • If leaving early • Experiment #9 – single replacement • Worksheet #5 – stoichiometry

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