Chemical Kinetics: do not understand anything

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Discussion Overview

The discussion revolves around the concept of instantaneous rates in chemical kinetics, particularly in the context of a homework question posed by a student. Participants explore the challenges of determining these rates and the implications of averaging in chemical reactions.

Discussion Character

  • Homework-related, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant asserts that instantaneous rates cannot be found exactly due to the vast number of particles involved in chemical reactions, suggesting that only average rates are meaningful.
  • Another participant emphasizes that the exact rates depend on detailed quantum mechanical calculations, which may be beyond the scope of the inquiry.
  • A different participant expresses concern about the teaching approach, questioning the qualifications of the chemistry teacher and the clarity of the student's question.
  • One participant notes that reactions involve changes in quantities that rarely exist independently and that these changes are associated with energy transformations, indicating the complexity of formulating a single equation for these phenomena.
  • A participant shares their experience of teaching rate laws and graphical approximations to a teacher with a background in English Literature, highlighting the challenges faced due to budget constraints in a public school setting.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of instantaneous rates, with some arguing against their exact determination and others questioning the teaching methods and understanding of the topic.

Contextual Notes

There are limitations regarding the assumptions made about the nature of chemical reactions and the dependence on quantum mechanical principles, which are not fully explored in the discussion.

burr.valentin
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Homework Statement


Our chemistry teacher just learned about chemical kinetics. I've been working with the calculus teacher to find out how to determine instantaneous rates exactly. We don't have any equation. Could someone explain this please?



Homework Equations





The Attempt at a Solution

 
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You can't find instantaneous rates exactly. Chemical reactions take place between [tex]\approx 10^{22}[/tex] particles, the only meaningful quantities are averages.

Even if you're looking at a single set of molecules in a reaction, the exact rates depend on detailed quantum mechanical calculations---I assume this is outside the scope of what you're looking for.

Can you be more precise in what you want to learn / achieve? Or what exactly you're having trouble understanding?
 
"Our chemistry teacher just learned about chemical kinetics"
this statement bothers me on many levels. Are they trying to teach it now? As stated above, I am not sure of your question.
 
instantaneous rate of a reaction can't b found exactly......as far as i know
reactions deal with the changes in quantities which rarely have any independent existence.
Also these changes constitute energy absorption/release in many ways...light, heat most probably in heat. combining all these phenomenon n restricting them to a single equation is something that just can't be imagined...but may be oneday we may succeed in doing so!
 
Our chemistry teacher actually has a degree in English Literature. We have no budget. I bought a few textbooks online and taught him the rate laws, etc. I also showed him a graphical approximations for finding tangent lines. I go to a public school. We have no budget.
 

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