1- Write the Nernst equation2 for the reaction Cu2+ (aq) + Zn (s) ® Zn2+ (aq) + Cu (s) Let activity of Cu2+ equal to 1 and change the activity of Zn2+ such that Q is in the range - 0.001 to +0.001. Select different values of Q and for each calculate Ecell.
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
1- Write the Nernst equation2 for the reaction Cu2+ (aq) + Zn (s) ® Zn2+ (aq) + Cu (s) Let activity of Cu2+ equal to 1 and change the activity of Zn2+ such that Q is in the range - 0.001 to +0.001. Select different values of Q and for each calculate Ecell. 2- Plot Ecell-Ecelle vs In Q. What is the effect of Q (that is the activity) on Ecell-Ecelle ? Is the effect the same at higher and lower values of Q? 3- what is the largest value of the absolute difference between cell potential and standard cell potential. Ecell-Ecelle? What do you expect the graph will look like for different number of electron transferred (n )? And why?
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