Single Replacement Reactions

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 gt H
• K gt H
• K gt 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 gt Na gt H
• Na gt Cr
• Cr gt H
• Ni gt H
• K gt Cr
• Can you determine an overall activity series?
• Is there any element that you can not place? Why?

8
Todays experiment

• In todays experiment you are going to
  investigate the combustion of 2 metals and 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 7 periodic properties
• Worksheet 8 writing reactions