Lab 7: Single Replacement Reactions and Relative Reactivity Post-Laboratory Ques

Question

Lab 7: Single Replacement Reactions and Relative Reactivity Post-Laboratory Questions 1. Explain why it was important to clean each piece of metal you used with sandpaper prior to doing the experiment. (2) What specific problem might you have encountered had you cleaned the metal surfaces with a soft tissue instead? 2. On the basis of your results from this experiment, what observation(s) did you make that would allow you to determine the place H2 would take in your relative activity series? custom page 109

Explanation / Answer

1.
(1)  Metals tend to react with oxygen or are hygroscopic. So in order to clean all resultant products of such
     reactions we clean the metal sample with sandpaper before the experiment so that you get to use pure
   metal for your chemical reaction.
(2) If soft tissued is being used those resultant product elements will not be removed from the surface of
     metal, thereby exposing impure metal for the reaction.

2. Any metal above hydrogen i.e) all active metals will displace H2 gas and any metal below H2 i.e)
   inactive metals will not displace hydrogen.

3.
(1) Total Ionic equation will be,
   3 Fe+2 + 6 Cl- + 2 Al -----------> 3 Fe (s) + 6 Cl- + 2 Al+3  
(2) Now remove the spectator ions i.e) Cl- to write net ionic equation,
     3 Fe+2 + 2 Al --------> 3 Fe (s) + 2 Al+3
(3) If FeCl2 was used at that point you will oxidized elements rather than reduced ones.

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