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Chapter 21: Q21.80P (page 975)

After the 1930s, chromium replaced nickel for corrosion resistance and appearance on car bumpers and trim. How does chromium protect steel from corrosion?

Short Answer

Expert verified

Even though chromium can corrode, the oxide it is found to safeguard the metal inside.

Step by step solution

01

Step 1:

Like nickel, chromium can get corroded, too. However, the oxide it forms protects other metals in the bumpers and trim. Chromium-enriched items have chromium acts as a barrier to prevent further oxidation or corrosion of the metals.

Although chromium is capable of being corroded, the oxide that it forms protects the metal inside.

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Most popular questions from this chapter

To improve conductivity in the electroplating of automobile bumpers, a thin coating of copper separates the steel from a heavy coating of chromium.

  1. What mass of Cuis deposited on an automobile trim piece if plating continues for1.25 hat a current of5.0 A?
  2. If the area of the trim piece is50.0 cm2, what is the thickness of theCucoating (d ofCu = 8.95 g/cm3)?

A voltaic cell is constructed with anSn/Sn2 +half-cell and aZn/Zn2 +half-cell. The zinc electrode is negative.

(a) Write balanced half-reactions and the overall reaction.

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The following reactions are used in batteries:

I2H2(g)+O2(g)鈫�2H2O(l)Ecell=1.23VIIPb(s)+PbO2(s)+2H2SO4(aq)鈫�2PbSO4(s)+2H2O(l)Ecell=2.04VIII2Na(l)+FeCl2(s)鈫�2NaCl(s)+Fe(s)Ecell=2.35V

The reaction I is used in fuel cells, II in the automobile lead-acid battery, and III in an experimental high-temperature battery for powering electric vehicles. The aim is to obtain as much work as possible from a cell while keeping its weight to a minimum. (a) In each cell, find the moles of electrons transferred and鈭�G . (b) Calculate the ratio, in kJ/g, ofwmaxto mass of reactants for each of the cells. Which has the highest ratio, which is the lowest, and why? (Note: For simplicity, ignore the masses of cell components that do not appear in the cell as reactants, including electrode materials, electrolytes, separators, cell casing, wiring, etc.)

A voltaic cell consists of a standard hydrogen electrode in one half-cell and a Cu/Cu2+ half-cell. Calculate[Cu2+] whenEcell掳 is 0.22V

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