   Chapter 11, Problem 8CQ

Chapter
Section
Textbook Problem

The U.S. penny is now made of copper-coated zinc. Can a calorimetric experiment be devised to test for the metal content in a collection of pennies? If so, describe the procedure.

To determine
The metal content in the collection of pennies using calorimetric experiment.

Explanation

Calorimetric experiment uses the concepts of conservation of energy. Considering the calorimetric system as isolated system, the calorimetric experiment can be easily devised to test for metal content in a collection of pennies.

Consider the system as an isolated system, where neither heat comes into the system from the surrounding nor it leaves out. Take some pennies which is preheated to some know higher temperature let it be Ti,pennies .

Take a known quantity of water mwater at lesser temperature Ti,water . Put the pennies in to the water and wait till equilibrium temperature Tf is reached. Let x amount of copper and (1x) amount of zinc content is present in the mass of pennies mpennies .

Use the below conservation of energy equation

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