18 Questions
What is the primary characteristic that distinguishes primary cells from secondary cells?
The ability to be recharged
What is the purpose of the electrolyte in a galvanic cell?
To provide a pathway for ions to move between electrodes
What type of galvanic cell is the Leclanche cell?
Dry cell
What occurs at the anode (zinc) electrode in the Daniell cell?
It loses mass
What is the common feature of all galvanic cells?
They contain two electrodes in contact with an electrolyte
What is the purpose of the copper sulphate solution in the Daniell cell?
To react with the zinc strip
What is the primary function of the reaction between Zn2+ and NH3 in a Leclanche cell?
To prevent the buildup of ammonia gas around the cathode
What is the overall cell reaction in a Leclanche cell?
Zn(s) + 2NH4+(aq) + 2MnO2(s) → Zn2+(aq) + Mn2O3(s) + H2O(l) + 2NH3(aq)
In the voltaic cell described in Exercise 4.4, which half-cell reaction involves the reduction of silver ion?
Silver rod half-cell
What is the purpose of the salt bridge in the voltaic cell described in Exercise 4.4?
To connect the two half-cells
What is the effect of cold weather on the voltage of a Leclanche cell?
It decreases the voltage
What type of ion is formed by the reaction between Zn2+ and NH3 in a Leclanche cell?
Complex ion
What is the role of manganese dioxide in a Leclanche dry cell?
It acts as a depolarizer
What is the primary difference between a Daniell cell and a Leclanche cell?
The Leclanche cell uses a moist electrolyte paste while the Daniell cell uses solutions
What is the purpose of the salt bridge in a Daniell cell?
To maintain electrical neutrality between the two solutions
What is the half-cell reaction at the anode of a Daniell cell?
Zn(s) → Zn2+(aq) + 2e
What is a significant advantage of dry cells over wet cells?
Dry cells are more portable than wet cells because they do not contain solutions
What is the primary function of a salt bridge in a galvanic cell?
To maintain electrical neutrality between the two solutions
Explore the classification and functions of primary and secondary cells in galvanic cells. Learn how these cells store electrical energy as chemical energy and convert it back when in use. Discover the differences between primary cells and secondary cells.
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