(a) Which direction do the electrons go in the external wire? toward the zinc el
ID: 791510 • Letter: #
Question
(a) Which direction do the electrons go in the external wire?toward the zinc electrodetoward the copper electrode
(b) In which half cell will a reduction take place?
Zn2+/ZnCu2+/Cu
(c) Which half cell is the anode?
Cu2+/CuZn2+/Zn
(d) Which direction do the anions in the salt bridge flow?
toward the copper celltoward the zinc cell
(e) Select the true statement about phenomena at the electrodes.
The zinc electrode increases in mass, and the copper electrode decreases in mass.The copper electrode increases in mass, and the zinc electrode decreases in mass.
(f) What happens if the leads to the copper and zinc electrodes are switched?
The direction of current flow through the meter is reversed, and the sign of the voltage reading changes.The electrodes switch function, so the zinc is reduced and the copper is oxidized, and the sign of the voltage reading changes.
(g) What is the standard cell potential (E toward the zinc electrodetoward the copper electrode Zn2+/ZnCu2+/Cu Cu2+/CuZn2+/Zn toward the copper celltoward the zinc cell The zinc electrode increases in mass, and the copper electrode decreases in mass.The copper electrode increases in mass, and the zinc electrode decreases in mass. The direction of current flow through the meter is reversed, and the sign of the voltage reading changes.The electrodes switch function, so the zinc is reduced and the copper is oxidized, and the sign of the voltage reading changes. Consider the case where the Cu2+/Cu and Zn2+/Zn half cells are connected in an electrochemical cell, as shown below. In the picture, the two black rectangles are the metal electrodes, connected by an external wire. The electrodes are immersed in solutions of their respective ions. Use the table of Standard Reduction Potentials in the Lab Manual to answer the following questions. Which direction do the electrons go in the external wire? toward the zinc electrodetoward the copper electrode In which half cell will a reduction take place? Zn2+/ZnCu2+/Cu Which half cell is the anode? Cu2+/CuZn2+/Zn Which direction do the anions in the salt bridge flow? toward the copper celltoward the zinc cell Select the true statement about phenomena at the electrodes. The zinc electrode increases in mass, and the copper electrode decreases in mass. The copper electrode increases in mass, and the zinc electrode decreases in mass. What happens if the leads to the copper and zinc electrodes are switched? The direction of current flow through the meter is reversed, and the sign of the voltage reading changes. The electrodes switch function, so the zinc is reduced and the copper is oxidized, and the sign of the voltage reading changes. What is the standard cell potential (E degree cell)?
Explanation / Answer
Cu2+(aq) + Zn(s) ? Cu(s) + Zn2+(aq), E0cell = 1.10 V.
a)Zn --> Zn^2+ + 2e- reaction in which zinc is being oxidized this is the reduction reaction. hence, electrons go from Zn2+/Zn terminal to Cu2+/Cu terminal
b) in Cu2+/Cu terminal reduction takes place
c)in Zn2+/Zn half cell is the anode
d) Anions(Zn2+) flow towards cathode (Cu2+/Cu) in salt brigde
e)e true statement----->.The copper electrode increases in mass, and the zinc electrode decreases in mass.
g) standard cell potential= E0cell = 1.10 V.
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