Understanding Oxidizing Agents in 2CuO + C

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Discussion Overview

The discussion revolves around identifying the oxidizing agent in the reaction 2CuO + C = 2Cu + CO2. Participants explore the roles of the substances involved, particularly focusing on the oxidation states of copper, oxygen, and carbon, as well as the definitions and interpretations of oxidizing agents.

Discussion Character

  • Homework-related
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant states that CuO is the oxidizing agent because it is the substance that gained electrons, despite it not existing after the reaction.
  • Another participant argues that the definition of oxidizing agents can be arbitrary and suggests that the focus should be on the reactants without deeper details about the specific compounds.
  • A participant questions whether Cu can be considered the oxidizing agent since it is derived from CuO, leading to a clarification that CuO is indeed the reactant in question.
  • There is an acknowledgment that chemistry can sometimes seem arbitrary, particularly in the context of identifying oxidizing agents.
  • One participant expresses frustration with the memorization aspect of chemistry, suggesting that understanding will improve with time and experience.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether CuO or Cu should be considered the oxidizing agent, indicating that multiple competing views remain regarding the interpretation of oxidizing agents in this reaction.

Contextual Notes

The discussion highlights the complexity of defining oxidizing agents and the potential for varying interpretations based on the context of the reaction and the substances involved. There is also an acknowledgment of the challenges associated with memorization in chemistry.

Who May Find This Useful

This discussion may be useful for students studying redox reactions, particularly those grappling with the concepts of oxidation states and the definitions of oxidizing and reducing agents.

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Homework Statement



Which substance is the oxidizing agent in this reaction? 2CuO + C = 2Cu + CO2

Homework Equations



2CuO + C = 2Cu + CO2

The Attempt at a Solution



According to the online program I'm using for homework, CuO is the oxidizing agent, but I don't understand why. The oxidizing agent is the substance that gained electrons. Cu had an oxidation state of +2 prior to the reaction, and ends up gaining electrons to form neutral Cu. Each oxygen had an oxidation state of -2 prior to the reaction and ends up with -2 after the reaction. Carbon has an oxidation state of zero prior to the reaction and ends up with +4 after the reaction since it is reduced.

So 4 electrons are taken from carbon and given to 2 copper atoms. Shouldn't Cu be the oxidizing agent here? CuO doesn't even exist after the reaction, so how can it have gained electrons?
 
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All you want to look at is the reactant, no deeper details such as which metal oxide you're using to oxidize C, or the specific mechanism. Sorting "spectators" like K+ from chemistries of aqueous solutions can be arbitrary, and sorting oxidizer, oxidizing agent, can be equally arbitrary, but the reaction as written involves mixing two black solids and getting a bright metal and a gas as products, one reactant was oxidized, and one reactant was reduced. You can also look at it from the point of view that CuO is a way of identifying a specific oxidized copper compound to use in the reaction reducing copper.
 
So you're saying that since CuO is a reactant, you can't separate the Cu out of it and say that Cu was the oxidizing agent?
 
Correct.
 
Thanks Bystander.
 
Anytime. Chemistry can be "arbitrary" at times.
 
Eh. It's the memorization that's killing me.
 
Been there --- enough rote memory will eventually reach a critical mass in which "contexts" will begin to take shape, and you'll be able to start memorizing exceptions to general rules rather than everything that's presented.
 

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