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In a chemical cold pack, two substances are kept separate

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 62P Chapter 3

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 62P

In a chemical cold pack, two substances are kept separate by a divider. When the divider is broken, the substances mix and absorb heat from the surroundings. The chemical cold pack feels cold. Is the reaction exothermic or endothermic? Draw an energy diagram showing the relative energies of the reactants and products in the reaction.

Step-by-Step Solution:
Step 1 of 3

Solution 62P

Answer :

Hand warmers work by creating an exothermic chemical reaction that produces heat when the contents react with air or each other. Most commonly, hand warmers use pouches of fine iron filings that oxidize in the presence of air, water and salt, producing heat in the process.

Iron oxide hand warmers are cheap and easy to produce, but they only work once. Once the hand warmer is exposed to oxygen, the oxidation reaction begins and it cannot be stopped. The reaction continues until all the iron has reacted, at which point the heat dies down. Depending on the amount of iron present in the hand warmer, this may take several hours to complete.

Reusable hand...

Step 2 of 3

Chapter 3, Problem 62P is Solved
Step 3 of 3

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

This full solution covers the following key subjects: Cold, chemical, reaction, Substances, pack. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. The full step-by-step solution to problem: 62P from chapter: 3 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. The answer to “In a chemical cold pack, two substances are kept separate by a divider. When the divider is broken, the substances mix and absorb heat from the surroundings. The chemical cold pack feels cold. Is the reaction exothermic or endothermic? Draw an energy diagram showing the relative energies of the reactants and products in the reaction.” is broken down into a number of easy to follow steps, and 55 words. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. Since the solution to 62P from 3 chapter was answered, more than 1000 students have viewed the full step-by-step answer.

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