a. 0.94 V b. 0.64 V c. 2.13 V d. 1.85 V 8. What is the single oxidation number f

Question

a. 0.94 V

b. 0.64 V

c. 2.13 V

d. 1.85 V

8. What is the single oxidation number for nitrogen in dinitrogen pentoxide?

a. +3

b. -3

c. +4

d. -4

e. +5

d. The paint prevents atmospheric oxygen from reaching the metal 5. Stainless steel is an alloy that combines iron with a. Carbon b. Chromium c. Tin d. Copper 6. Which of the following reactions will NOT occur spontaneously? a. Cu2 (aq) + Pb(s) Cu(s) + Pb2+ (aq) b. Sn2+(a?) +Zn(s) Sn(s) +Zn2+(a?) c. 2K (aq) +Ca(s)- 2K(s) Ca2 (aq) d. 3Hg2 (aq) +2Al(s) 3Hg(s) + 2Al3 (a?) An electrochemical cell is constructed with a tin electrode immersed in a 1.0 M SnCl2 solution and a silver electrode immersed in a 1.0 M AgNO3 solution. At 25°C, the standard potential for this galvanic cell is: 7. c. 2.13 V d. 1.85 V a. 0.94v b. 0.64 V 8. What is the single oxidation number for nitrogen in dinitrogen pentoxide? e. +5 c. +4 a. +3

Explanation / Answer

5). The stainless stell consists of mostly iron with some parts of nickel and chromium. The alloy contains approximately 10% chromium because chromium protects steel from corrosion. Chromium corrodes first and forms a thin layer of chromium rust over the iron and thus prevents iron from rusting.

Hence, stainless steel is an alloy that combines iron with Chromium to inhibit rusting.

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