1. Rank the following metals by ease of oxidation, from hardest to easiest: Cu;

Question

1. Rank the following metals by ease of oxidation, from hardest to easiest: Cu; aluminum, Al; Fe; and chromium, Cr. 4. Describe an electrochemical cell that would have the following net equation, by answering the following questions. Fe(s) + Ni2+ (aq) + Ni(s) + Fe2+ (aq) (1) Write the reduction and oxidation half-equations for the cell. 2. An Al strip is placed in CuSO4 solution. (1) Would you expect a spontaneous reaction to occur, based on the net potential? (2) Sketch the electrochemical cell. Identify the components of the cell as in Figure 1. (2) If your answer to (1) is "yes" what would you observe? (3) Write a chemical equation that describes your predicted observations. 3. Describe what you would observe if you placed an Ag strip in an aluminum nitrate solution, AI(NO3)3- (3) Calculate the expected net voltage for this cell.

Explanation / Answer

Ans 1 :

The oxidation refers to the increase in oxidation state of the element.

The oxidation state of all the elements in their standard state is 0.

So for their oxidation , an electron has to be removed from its outermost shell.

Now lesser the ionization energy, more easily the electron will be removed.

So the order in decreasing ionisation energy or easiest to oxidise will be :

: Fe , Cu , Cr , Al

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