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 Cr + HCl  CrCl2 + H2
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