Explaining How Temperature Change Affects Chemical Equilibrium

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Discussion Overview

The discussion revolves around how temperature changes affect chemical equilibrium, specifically in the context of exothermic and endothermic reactions. Participants explore the implications of temperature variations on the direction of equilibrium shifts according to Le Chatelier's principle.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant, sirsh, describes their understanding that in an exothermic reaction, decreasing temperature acts as a 'product', prompting the system to convert energy to enthalpy.
  • Another participant references Le Chatelier's principle, stating that for exothermic reactions, an increase in temperature shifts equilibrium to the left, while for endothermic reactions, it shifts to the right.
  • A subsequent post reiterates the shifts in equilibrium for both exothermic and endothermic reactions, seeking further clarification on the underlying reasons for these shifts.
  • A later reply provides a link to additional information on Le Chatelier's principle and summarizes that equilibrium shifts to counteract changes in temperature, concentration, volume, or pressure.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and seek clarification on the principles involved. While there is a general acknowledgment of Le Chatelier's principle, the discussion includes questions and requests for further explanation, indicating that not all aspects are fully agreed upon or understood.

Contextual Notes

Some statements rely on assumptions about the definitions of exothermic and endothermic reactions, and the discussion does not resolve the nuances of how temperature changes specifically affect the enthalpy of reactions.

Who May Find This Useful

This discussion may be useful for students or individuals interested in chemical equilibrium, particularly those seeking to understand the effects of temperature on reaction dynamics.

Sirsh
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Hey all the people reading this, Just wondering if anyone can explain how a equilibrium system changes with a increase/decrease in temperature occurs.


I've been taught that: If my reaction is exothermic i.e. reactants -> products + energy; and i am going to decrease temperature it would be said that the energy acts as a 'product' therefore to counteract this the system would have to convert the loss of energy to enthalpy or something.

could someone please help me with this!

Thank you! - sirsh.
 
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What you refer to is LeChatelier's principle. Exotermic reaction equilibrium shifts to the left when temperature increases, endotermic reaction equilibrium shifts to the right when temperature increases.

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methods
 
So. temperature is increased: Reactants -> products + energy then we will see a shift to the left. if the temp for this exothermic reaction is decreased the reaction will shift to the right? and then the same for endothermic in the reaction where temperature is increased: reactants + energy -> products, when the temp increases equilibrium shifts to the right and when decreases it shifts to the left. can you please explain to me why? if that's not too much to ask. thanks a lot!
 
http://en.wikipedia.org/wiki/Le_chatelier's_principle

If a chemical system at equilibrium experiences a change in concentration, temperature, volume, or partial pressure, then the equilibrium shifts to counteract the imposed change and a new equilibrium is established.

In the exothermic reaction - when temperature goes up - shifting equilibrium to the left lowers temperature of the reaction mixture. That a direct application of principle. Similar thinking for endothermic reaction and increased temp.

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