Type of Reaction: Ethene + Steam --> Ethanol

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Discussion Overview

The discussion centers around the chemical reaction of ethene with steam to produce ethanol, specifically focusing on identifying the type of reaction and the associated changes in oxidation states. The scope includes conceptual understanding and clarification of chemical reaction types.

Discussion Character

  • Conceptual clarification, Debate/contested, Homework-related

Main Points Raised

  • One participant initially identified the reaction as oxidation, but later acknowledged that the correct classification is addition, as confirmed by their teacher.
  • Another participant noted that water is reduced in the reaction, supporting the classification as an addition reaction.
  • A participant inquired about how to determine the change in oxidation number for the reaction, questioning its feasibility.
  • Another response suggested that while it is generally possible to count electrons to find oxidation changes, it may not be straightforward in an addition reaction due to the nature of the reactants and products involved.

Areas of Agreement / Disagreement

Participants generally agree that the reaction is classified as an addition reaction, but there is uncertainty regarding the determination of oxidation states and the roles of the reactants in terms of oxidation and reduction.

Contextual Notes

There are limitations in determining oxidation changes in this specific reaction due to the complexity of the reactants and products, and the discussion does not resolve how to definitively identify oxidation states in this context.

Colin Cheng
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Hi everyone. I'm a high school student. Recently I have been doing some past papers to prepare for the public exam in April. The reaction "ethene + steam ----> ethanol" is given and I was asked to name the type of reaction. I answered oxidation but the answer is addition. Later I asked my teacher and he said oxidation is wrong as the change in oxidation number is hard to find. What I think is simply that there's an extra O atom added to the compound. Is this thought wrong?
 
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... and, water has been reduced ... It's an "addition."
 
How can we find the change in oxidation number in the reaction? Is it possible?
 
Colin Cheng said:
How can we find the change in oxidation number in the reaction?
In general? Count electrons.
Colin Cheng said:
Is it possible?
Not for an addition reaction; the single product is the combination of two reactants, one of which may have been oxidized and the other reduced. But, which is which?
 
Ok got it, thanks
 

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