Q21.22 P - Chemistry: Molecular Nature Of Matter And Change

Question

Consider the following general voltaic cell:

Identify the (a) anode, (b) cathode, (c) salt bridge, (d) electrode at which  leave the cell, (e) electrode with a positive charge, and electrode that gains mass as the cell operates (assuming that a metal plates out).

 

Step-by-Step Solution

Answer

(a)  A

(b)   E

(c)  C

(d)  A

(e)  E 

(f)    E

Step 1: Definition of Chemical Change and Electrical Work

Electrochemistry is a discipline of physical chemistry concerned with the relationship between electrical potential as a quantifiable and quantitative phenomenon and recognisable chemical change, with electrical potential as an outcome of a specific chemical change or vice versa.

Step 2: Identify the following general voltaic cell

A voltaic cell is an electrochemical cell that generates electricity by a spontaneous redox reaction.

We can deduce the following from the diagram: 

(a) Anode:A

(b) Cathode:E

(c) Salt bridge:C

(d) Electrode where leaves the cell:A

(e) Positively charged electrode:E

(f) An electrode that accumulates mass while the cell works: E