
Concept explainers
Interpretation: If iron nails are left outside, they will rust according to the reaction:
This reaction not appears to release light and heat to be described.
Concept introduction:

Answer to Problem SII3RE
Given reaction occurs very slowly. Thus without being noticed energy of this reaction is lost to the environment.
Explanation of Solution
Given reaction is as follows:
This reaction occurs very slowly. Thus without being noticed energy of this reaction is lost to the environment. Due to this reason given reaction not appears to release light and heat.
During a chemical change amount of energy transferred per gram or per mole is commonly called the heat of reaction
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Living By Chemistry: First Edition Textbook
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