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Chapter 21: Q21.74P (page 922)

What is the direction of electron 铿俹w with respect to the anode and the cathode in a battery? Explain.

Short Answer

Expert verified

The direction of electron 铿俹w is from anode to cathode

Step by step solution

01

What is a Battery?

When some voltaic cells are connected in series, it forms a battery. The voltaic cells are arranged in series so that the overall potential of the battery is the sum of the potential of the individual batteries.

02

Working of a battery

Since a battery is a collection of voltaic cell, the working principle of battery is similar to voltaic cell. Therefore a battery also has two electrodes- cathode and anode.

Oxidation occurs at anode. Thus the electrons liberated during oxidation flows through an external wire to the cathode where the electrons are accepted by the ion present in the solution to undergo reduction.

Thus in a battery, electrons flow from anode to cathode.

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Most popular questions from this chapter

Commercial electrolysis is performed on both moltenand aqueoussolutions. Identify the anode product, cathode product, species reduced, and species oxidized for the anode.

(a) molten electrolysis and

(b) aqueous electrolysis.

How are protons removed when balancing a redox reaction in a basic solution?

From the skeleton equations below, create a list of balanced half-reactions in which the strongest oxidizing agent is on top and the weakest is on the bottom:

U3 +(aq) + Cr3 +(aq)鈫�Cr2 +(aq) +U4 +(aq)Fe(s) + Sn2 +(aq)鈫�Sn(s) + Fe2 +(aq)Fe(s) +U4 +(aq)鈫�no reactionCr3 +(aq) + Fe(s)鈫�Cr2 +(aq) + Fe2 +(aq)Cr2 +(aq) + Sn2 +(aq)鈫�Sn(s) + Cr3 +(aq)

A chemist designs an ion-specific probe for measuring [ Ag+] in an NaCl solution saturated with AgCl. One half-cell has an Ag-wire electrode immersed in the unknown AgCl saturated NaCl solution. It is connected through a salt bridge to the other half-cell, which has a calomel reference electrode [a platinum wire immersed in a paste of mercury and calomel ( Hg2Cl2)] in a saturated KCl solution. The measuredEcell is 0.060V. (a) Given the following standard half-reactions, calculate [Ag+ ].

Calomel:Hg2Cl2(s) + 2e-鈫�2Hg + 2Cl-Eo= 0.24 V

Silver:Ag+(aq) +e-鈫�Ag(s)Eo= 0.80 V

(Hint: Assume [ Cl-] is so high that it is essentially constant.) (b) A mining engineer wants an ore sample analyzed with theAg+ - selective probe. After pre-treating the ore sample, the chemist measures the cell voltage as V. What is [ Ag+]?

A voltaic cell consists of Cr/Cr3 and Cd/Cd2 half-cells with all components in their standard states. Afterminutes of operation, a thin coating of cadmium metal has plated out on the cathode. Describe what will happen if you attach the negative terminal of a dry cell (V) to the cell cathode and the positive terminal to the cell anode.
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