A) Show the galvanic cell in which the following reactions takes place. 2 Cr(s) + 3 Cd2+(aq) = 2Cr3+(aq) +3Cd(s) (Cr = -0.74 v, Cd = -0.40 V) (B) Find the E cell. (C) write the reaction occurring on the positive electrode ? (D) write the reaction occurring on the negative electrode ?
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6
Solution:
The galvanic cell in which the given reaction takes place is depicted as:
Zn(s)∣Zn
2+
(aq)∣∣Ag
+
(aq)∣Ag(s)
(i) The negatively charged electrode is the zinc electrode. It acts as an anode.
(ii) In the external circuit, the current will flow from silver to zinc.
(iii) Oxidation at anode: Zn(s)→Zn
2+
(aq)+2e
−
Reduction at cathode:
+
(aq)+e
−
→Ag(s)
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Answer:
In everyday use and in kinematics, the speed of an object is the magnitude of the rate of change of its position with time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
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