Cathodic protection of a metal pipe against corrosion usually entails ________.
A) attaching an active metal to make the pipe the anode in an electrochemical cell
B) coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe
C) attaching an active metal to make the pipe the cathode in an electrochemical cell
D) attaching a dry cell to reduce any metal ions which might be formed
E) coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize)
Question 2
You are given two clear solutions of the same unknown monoprotic acid, but with different concentrations. Which statement is true?
A) There is no chemical method designed to tell the two solutions apart.
B) It would take more base solution (per milliliter of the unknown solution) to neutralize the more concentrated solution.
C) A smaller volume of the less concentrated solution contains the same number of moles of the acid compared to the more concentrated solution.
D) If the same volume of each sample was taken, then more base solution would be required to neutralize the one with lower concentration.
E) The product of concentration and volume of the less concentrated solution equals the product of concentration and volume of the more concentrated solution.
René Magritt,. The Treason of Images, Ceci n'est past une pipe.
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