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Homework Help for Chemistry
Chemistry is the science that deals with the structure, properties and transformations of the bodies based on their composition.
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The technique of protecting metal from accelerated corrosion by connecting it to a different metal that is more easily oxidized, i.e. the sacrificial anode, is called cathodic
protection. It's not necessary to cover the entire surface of the metal to be protected with the second, more easily oxidized metal. All that's required is electrical contact with the second, sacrificial metal. An underground steel pipeline, for example, can be protected by connecting it through an insulated wire to the sacrificial anode. Cathodic protection runs out when the sacrificial anode is completely consumed or the connection between the two dissimilar metals is broken. Which of the four metals below offers cathodic protection to the iron in the steel pipe? (Remember, steel is iron plus a small percentage of carbon.)
A solution contains one or more of the following ions: Hg2+2, Ba2+, and Fe2+. When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no precipitate. When potassium carbonate is added to the remaining solution, a precipitate forms. Part B Write net ionic equations for the formation of each of the precipitates observed. Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer.
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