A student wishes to set up an electrochemical cell. The following list of materials and equipment will be used:• two 250-ml beakers• wire• one piece of Zn metal• 125 ml of 0.10 M Zn(NO3)2• voltmeter• switch• one piece of Pb metal• 125 ml of 0.10 M Pb(NO3)2For the cell to operate properly, the student will also need:A) an anodeB) a cathodeC) an external path for electronsD) a salt bridge

D) a salt bridge

Explanation:

A salt bridge completes an electrochemical cell. A salt bridge maintains charge balance in the two half cells. If the salt bridge is not present, the anode compartment becomes positively charged while the cathode compartment becomes negatively charged hence the reaction reaches equilibrium and comes to a halt quickly.

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