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Chapter 21: Q21.78P (page 975)

During reconstruction of the Statue of Liberty, Teﬂon spacers were placed between the iron skeleton and the copper plates that cover the statue. What purpose do these spacers serve?

Short Answer

Expert verified

These spacers keep the copper and iron metals apart and prevent the iron from corroding.

Step by step solution

01

Use of Spacers

These spacers separate the copper and iron metal. prevention of contact stops the electron from transferring from one metal to another, it prevents reduction and oxidation to occur.

This prevents corrosion of the iron metal.

Hence these spacers separate the copper and iron metals and prevent corrosion of the iron metal.

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Most popular questions from this chapter

Question: To examine the effect of ion removal on cell voltage, a chemist constructs two voltaic cells, each with a standard hydrogen electrode in one compartment. One cell also contains a ${Pb/Pb}^{2 +}$ half-cell; the other contains a ${Cu/Cu}^{2 +}$ half-cell.

(a) What is $E^{o}$ of each cell 298 K at?

(b) Which electrode in each cell is negative?

(c) When ${Na}_{2} S$ solution is added to the ${Pb}^{2 +}$ electrolyte, solid $PbS$ forms. What happens to the cell voltage?

(d) When sufficient ${Na}_{2} S$ is added to the ${Cu}^{2 +}$ electrolyte, $CuS$ forms and ${[Cu}^{2 +}]$ drops to $1 \times 10^{- 6}$ . Find the cell voltage.

Which type of electrochemical cell has ${ΔG}_{sys} < 0$ ? Which type shows an increase in free energy?

Commercial electrolytic cells for producing aluminium operate at $5.0 V$ and $100,000 A$ .

(a) How long does it take to produce exactly 1metric ton ( $1000 kg$ ) of aluminium?

(b) How much electrical power (in kilowatt-hours, $kW \cdot h$ ) is used [ $1 W = 1 J/s;1 kW \cdot {h = 3.6×10}^{3} KJ$ ]?

(c) If electricity costs $0.90$ per $kW \cdot h$ and cell efficiency is $90%$ , what is the cost of electricity to produce exactly $1 lb$ of aluminium?

A voltaic cell using Cu/ ${Cu}^{2 +}$ and Sn/ ${Sn}^{2 +}$ half-cells is set up at standard conditions, and each compartment has a volume of345mL. The cell delivers $0.17$ A for $48.0$ h. (a) How many grams of Cu(s) are deposited? (b) What is the [ ${Cu}^{2 +}$ ] remaining?

A voltaic cell is constructed with an ${Ag/Ag}^{+}$ half-cell and a ${Pb/Pb}^{2 +}$ half-cell. The zinc electrode is negative.

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

(b) Diagram the cell, labeling electrodes with their charges and showing the directions of electron flow in the circuit and of cation and anion flow in the salt bridge.

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