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Chapter 21: Q75P (page 975)

In the everyday batteries used for 铿俛sh lights, toys, etc., no salt bridge is evident. What is used in these cells to separate the anode and cathode compartments?

Short Answer

Expert verified

Electrolyte pastes divide the electrodes. They are separated in dry cells byZnCll2,NH4Cl,MnO2,H2Oandgraphite.

Step by step solution

01

Step 1:

In batteries, Electrodes are separated by electrolyte pastes. In dry cells, they are separated byZnCll2,NH4Cl,MnO2,H2Oandgraphite.

Hence Electrodes are separated by electrolyte pastes. In dry cells, they are separated byZnCll2,NH4Cl,MnO2,H2Oandgraphite.

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Most popular questions from this chapter

Consider the following general voltaic cell:

Identify the (a) anode, (b) cathode, (c) salt bridge, (d) electrode at which leave the cell, (e) electrode with a positive charge, and electrode that gains mass as the cell operates (assuming that a metal plates out).

Which of the following metals are suitable for use as sacri铿乧ial anodes to protect against corrosion of underground iron pipes? If any are not suitable, explain why:

(a) Aluminium

(b) Magnesium

(c) Sodium

(d) Lead

(e) Nickel

(f) Zinc

(g) Chromium

Consider the following voltaic cell

(a) In which direction do electrons flow in the external circuit?

(b) In which half-cell does oxidation occur?

(c) In which half-cell do electrons enter the cell?

(d) At which electrode are electrons consumed?

(e) Which electrode is negatively charged?

(f) Which electrode decreases in mass during cell operation?

(g) Suggest a solution for the cathode electrolyte.

(h) Suggest a pair of ions for the salt bridge.

(i) For which electrode could you use an inactive material?

(j) In which direction do anions within the salt bridge move to maintain charge neutrality?

(k) Write balanced half-reactions and an overall cell reaction.

Zinc plating (galvanizing) is an important means of corrosion protection. Although the process is done customarily by dipping the object into molten zinc, the metal can also be electroplated from aqueous solutions. How many grams of zinc can be deposited on a steel tank from a ZnSO4solution when a0.855 - A current flows for2.50 days?

Why do steel bridge-supports rust at the waterline but not above or below it?

See all solutions

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