QUESTION 4 2 points Zinc metal is used as a sacrificial anode to protect iron fr

Question

QUESTION 4 2 points Zinc metal is used as a sacrificial anode to protect iron from rusting. If you wanted to coat a galvanized nail with a sacrificial anode to protect zino from rusting, name one example of an alkaline earth metal that could be used. Give the chemical symbol of the metal QUESTION 5 2 points What is the oxidation state of Nitrogen in Cu(NO3)2? Write your answer with the sign +or-) followed by the integer QUESTION 6 2 points What is the oxidation state of Iron in K3Fe(CN)6? Write your answer with the sign (+or- followed by the integer QUESTION 7 2 poin In Eastern Canada, vehicles undergo rusting of the undercarriage much more frequently due to the presence of oxygen, water (from rain and snow, and Salt (Sodium chloride)present on roads QUESTION 8 2 points Make three matches with the following metals and a substance that may act as a suitable sacrificial electrode. All three metals have unique choices, you CANNOT reuse choices (for Example: if you pair Sodium metal with A-you cannot use A again for another metal) A. Sodium metal Barium- sacrificial electrode Iron metal Potassium metal C. Aluminum- sacrificial electrode Silver metal Tin-sacrificial electrode E. Gold-sacrificial electrode

Explanation / Answer

Q4

Calcium and Magnesium

Ca Or Mg

Q5.

      Cu(NO3)2 ---------> CU^2+ + 2NO3^-

       NO3^-

   The oxidation number of oxygen is -2

   x+ (-2*3) = -1

x-6+1 = 0

x-5 = 0

x = +5

The oxidation sate of nitrogen is + 5 in nitrate ion

Q6

    K3[Fe(CN)6] -----------> 3K^+ + [Fe(CN)6]^3-

   [Fe(CN)6]^3-

x+ (-1*6) = -3

x-6+3 = 0

x   = +3

The oxidation state of iron is +3

Q7.

   O2, H2O, NaCl

Q8. sodium ---------------------> potassium sacricial electrode

      Iron ---------------------> aluminum sacrificial electrode or barium sacrificial electrode or ptassium sacrificial electrode

      silver ----------------> Tin sacrificial electrode or aluminum sacrificial electrode or barium sacrificial electrode or ptassium sacrificial electrode

   

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