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EGEE 420 Quizzes 5-7 and Assignment 1 Questions and Answers 100% Correct
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EGEE 420 Quizzes 5-7 and Assignment 1
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EGEE 420 Quizzes 5-7 and Assignment 1Choose a schematic of the experimental setup used as an electrolytic cell
- diagram with DC
- diagram with resistor - answerDC instead of resistor
In the Daniell cell the copper metal bar is always a positive electrode.
- True
- False - answerTrue
What is the polarity of the zinc electrode during the electrolysis process in the Daniell
Cell?
- positive
- either negative or positive
- negative - answernegative
In the Daniell cell, each of the electrodes is placed in a mixture of ZnSO4(aq) and
CuSO4(aq).
- False
- True - answerFalse
How to deal with the waste solutions after the Daniell Cell lab?
- should be diluted and drained
- should be collected in containers
- should be left in the lab as they are - answershould be collected in containers
Calculate the total charge passed in the Daniell cell during 20 min using the data given
in the table:
Time, min Current, mA
0 21
5 22
10 23
15 24
20 25
- 30.0 C
- 27.6 C
- 25.2 C - answer27.6 C
, Calculate the theoretical cell potential of a Daniell cell (25 °C), which has copper
electrode on the right and zinc electrode on the left. The molal concentrations of
CuSO4(aq) and ZnSO4(aq) are, respectively, 0.1 and 1.0 mol/kg. Find and use the
mean activity coefficients from CRC Handbook assuming that the individual activity
coefficient of an ion equals the mean activity coefficient of the corresponding electrolyte.
1.102 V
1.088 V
-1.102 V - answer1.088 V
The reaction Zn(s) + CuSO4(aq) → Cu(s) + ZnSO4(aq) takes place in
- an electrolytic cell
- a galvanic cell
- an equilibrium cell - answera galvanic cell
In the Daniell cell, the power is produced when the cell is in
- the galvanic mode
- the electrolytic mode
- the equilibrium mode - answerthe galvanic mode
The reaction H2O(l) → (1/2) O2(g) + H2(g) takes place in
- an electrolytic cell
- a galvanic cell
- an equilibrium cell - answeran electrolytic cell
Arrange experimental procedures for the open circuit potential measurement: polishing
electrodes, weighing electrodes, connecting electrochemical cell and electrometer,
assembling the cell - answer(1) polishing electrodes
(2) weighing electrodes
(3) assembling the cell
(4) connecting electrochemical cell and electrometer
The instrument to use in the Daniell Cell lab for accurate measurement of the cell
potential is
- ammeter
- high impedance (resistance) electrometer
- power supply - answerhigh impedance (resistance) electrometer
What is the purpose of using a DC power supply in the Daniell Cell lab?
- to measure current
- to measure the cell potential
- to provide electrical power - answerto provide electrical power
The salt bridge in the Daniell Cell is for
- separating the electrode chambers
- conducting ions
- both of these - answerboth of these
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