2 Single Replacement Reactions Oxidation reduction or Redox reactionsElectron transfer reactionsA + BX B + AXElement A loses electrons to element BA + B+? A+? + BA A+? + ? electronsB+? + ? 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 > HK > HK > NaCan you put these all together to get an overall activity series?
6 More experiments Cr + NaCl NR Cr + HCl CrCl2 + H2 Which is more active Na or Cr?Cr + HCl CrCl2 + H2Which is more active Cr or H?Ni + HCl NiCl2 + H2Which is more active Ni or H?Cr + KCl NRWhich 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 experimentIn 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 seriesYou may need to sand some of the metal pieces to get a good surface for reactingOnly 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 earlyExperiment #9 – single replacementWorksheet #5 – stoichiometry