Presentation on theme: "Single Replacement Reactions Experiment #9. Single Replacement Reactions Oxidation reduction or Redox reactions Electron transfer reactions A + BX B +"— Presentation transcript:
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
Experiment Add sodium metal to water What happens?? Na + H 2 O Which is more active Na or H?
Experiment Add potassium metal to water What happens?? K + H 2 O Which is more active K or H? Which do you predict is more active K or Na?
Develop a combined activity series Na > H K > H K > Na Can you put these all together to get an overall activity series?
More experiments Cr + NaCl NR – Which is more active Na or Cr? Cr + HCl CrCl 2 + H 2 – Which is more active Cr or H? Ni + HCl NiCl 2 + H 2 – Which is more active Ni or H? Cr + KCl NR – Which is more active K or Cr?
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?
Todays experiment In todays 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.
Due today Experiment 10 – Double Displacement Reactions If leaving early – Experiment #9 – single replacement – Worksheet #5 – stoichiometry