Chapter U5.109, Problem 5E

Interpretation Introduction

Interpretation: Energy diagram for the oxidation of copper and its reverse reaction needs to be explained.

Concept Introduction: Oxidation of metal is exothermic. So, oxidation reactions are a potential source of energy for our daily lives. To explore the usefulness of metal oxidation as an energy source, we must examine and compare the amount of thermal energy transferred during these reactions.

Answer to Problem 5E

Oxidation of copper and its reverse reaction energy diagram is

  

  

Explanation of Solution

Oxidation reactions are good source of energy because they are always exothermic. So, oxidation reactions are a potential source of energy for our daily lives. Energy diagram of oxidation of copper is as follows:

  

Reverse reaction energy diagram of copper is as follows:

  

Decomposition of CuO is highly endothermic.

Conclusion

When an oxidation reaction for a metal is reversed, the resulting products are a pure metal and oxygen gas. This reaction is termed as decomposition reaction.