NACE CP2 STUDENT MANUAL CHAPTER 1: CORROSION
THEORY EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
Oxidation of the metal occurs at the ____
surfaces and reduction of ____ ions occurs at the ____.
A) anodic, hydrogen, cathode
B) cathode, OH-, anodic
C) anodic, OH-, cathode
D) cathode, anodic, electrolyte
E) cathode, hydrogen, electrolyte
a
At the cathodic surface in a corrosion cell, the electrons from the ____ meet ____
ions from the solution.
A) cathode, hydrogen
B) cathode, OH-
C) anode, hydrogen
D) anode, OH-
c
,The elements of a corrosion cell include which of the following? (select all that
apply)
A) anode
B) cathode
C) electrolyte
D) metallic/electronic path
a, b, c, d
Faraday's law calculates the
A) potential of a metal in seawater
B) potential of a metal in the metal ion solution
C) metal lost based on the resistance
D) metal lost due to current over time
d
Reference electrodes include which of the following? (select all that apply)
A) copper-copper sulfate
B) hydrogen
C) calomel
D) silver-silver chloride
a, b, c, d
,The stability of a copper-copper sulfate reference electrode does not vary with
A) temperature
B) exposure to sunlight
C) an unsaturated solution of copper ions
D) a saturated solution of copper ions
d
If a potential of -484 mV is measured with respect to a hydrogen reference
electrode, what is the potential with respect to a copper-copper sulfate electrode?
A) -168 mVcse
B) -316 mVcse
C) -800 mVcse
D) -1116 mVcse
c
E2 = -484 mV + ( 0 - 316 )
E2 = -484 mV + -316
E2 = -800 mV
E2 = E1 + (e1 - e2)
E1 = original measurement
E2 = desired conversion
, e1 = reference value of original half cell
e2 = reference value of conversion half cell
If a digital meter displays a negative value while measuring a voltage across a
resistor, it indicates that the:
A) current is flowing from the positive to the negative meter connection
B) current is flowing from the negative to the positive meter connection
C) meter is reading incorrectly
D) meter scale should be changed
b
The unit used to measure the electrochemical difference between two metals in
an electrolyte is which of the following:
A) amperes
B) volts
C) ohms
D) siemens
b
If lead, copper, steel, and aluminium are connected together in water, which will
corrode the most?
A) lead
B) copper
THEORY EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
Oxidation of the metal occurs at the ____
surfaces and reduction of ____ ions occurs at the ____.
A) anodic, hydrogen, cathode
B) cathode, OH-, anodic
C) anodic, OH-, cathode
D) cathode, anodic, electrolyte
E) cathode, hydrogen, electrolyte
a
At the cathodic surface in a corrosion cell, the electrons from the ____ meet ____
ions from the solution.
A) cathode, hydrogen
B) cathode, OH-
C) anode, hydrogen
D) anode, OH-
c
,The elements of a corrosion cell include which of the following? (select all that
apply)
A) anode
B) cathode
C) electrolyte
D) metallic/electronic path
a, b, c, d
Faraday's law calculates the
A) potential of a metal in seawater
B) potential of a metal in the metal ion solution
C) metal lost based on the resistance
D) metal lost due to current over time
d
Reference electrodes include which of the following? (select all that apply)
A) copper-copper sulfate
B) hydrogen
C) calomel
D) silver-silver chloride
a, b, c, d
,The stability of a copper-copper sulfate reference electrode does not vary with
A) temperature
B) exposure to sunlight
C) an unsaturated solution of copper ions
D) a saturated solution of copper ions
d
If a potential of -484 mV is measured with respect to a hydrogen reference
electrode, what is the potential with respect to a copper-copper sulfate electrode?
A) -168 mVcse
B) -316 mVcse
C) -800 mVcse
D) -1116 mVcse
c
E2 = -484 mV + ( 0 - 316 )
E2 = -484 mV + -316
E2 = -800 mV
E2 = E1 + (e1 - e2)
E1 = original measurement
E2 = desired conversion
, e1 = reference value of original half cell
e2 = reference value of conversion half cell
If a digital meter displays a negative value while measuring a voltage across a
resistor, it indicates that the:
A) current is flowing from the positive to the negative meter connection
B) current is flowing from the negative to the positive meter connection
C) meter is reading incorrectly
D) meter scale should be changed
b
The unit used to measure the electrochemical difference between two metals in
an electrolyte is which of the following:
A) amperes
B) volts
C) ohms
D) siemens
b
If lead, copper, steel, and aluminium are connected together in water, which will
corrode the most?
A) lead
B) copper
