# Questions tagged [kinetics]

The study of rates and steps in mechanisms of chemical processes.

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### Is dimerization just a synonym for asscociation with n=2? [closed]

Association is a process of the form $$\ce{nS<=>S_n}$$ Is dimerization refering to only the special case $n=2$ or is it synonymous for $n\in\mathbb{N}$?
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### Is it necessary that hydrolysis of ester will only take place in excess of water?

I was given a question on chemical kinetics in which the statement was given- "The Concentration of water in hydrolysis of ester does not change to much extent" I marked the statement to be false ...
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### I need explanation for reaction rate [closed]

That's a sample reaction: $$2N_2+3O_2->2N_2O_3\ \ \ r=k_1[N_2]^2[O_2]^3$$ Why can't I write this as $$N_2+\frac{3}{2}O_2->N_2O_3\ \ \ r=k_2[N_2][O_2]^{\frac{3}{2}}$$ Don't bother the elements. ...
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### Is equilibrium constant at a given temperature derived from Gibbs free energy of reaction valid for doing simple kinetic modelling?

I intend to do a kinetic study of simple alcohol catalytic dehydrogenation reactions in the gas phase. I want to start with simple power law kinetics using $K_\mathrm{eq}$ to account for the ...
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### Can I determine the rate law order from stoichiometric coefficients?

I've read in two books, and seen in three separate videos courses, that you cannot determine the rate law order from stoichiometric coefficients. Then, I have seen homework and "practice" problems ...
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### How to set up an equation to solve a rate law computationally?

I am confused on how to set up my equations to use in the solver. I have an equation $$\ce{A + 2B -> C}$$ As a given, it is first order in A and second order in B. What I need to do is to solve for ...
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### What is the activation energy of a Daniell cell?

I'm having trouble finding a posted literature value for the activation energy for the Daniell cell redox reaction: $$\ce{Cu^2+ + Zn -> Cu + Zn^2+}$$ Where might I be able to find this ...
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### What is the molecularity of a reaction if it has a fractional order as per rate equation? [closed]

The rate equation of any reaction is found by using its slowest step. My book says that molecularity of the slowest step of a reaction is equal to the order of the same reaction. However, there are ...
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### Rate of reaction involving different stoichiometric coefficients

Suppose I have a reaction (Say it is the Haber process): $$\ce{N2 + 3H2 <=> 2NH3}$$ If we have to calculate the average rate of reaction of the above we follow the reasoning the rate of ...
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### Rate determining step for parallel reaction?

I have always read that the rate determining step is the slowest step in a reaction (source: Wikipedia). In chemical kinetics, the overall rate of a reaction is often approximately determined by ...
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### Order of Reaction differs in equation and linearisation

I have given the following equation: $A + 2B \rightarrow C$ $v = –k\cdot [A]\cdot[B]^2$ gives me the orders 1 for A and 2 for B. That results in a total order of the reaction of 3. So far so good. ...
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### How does the rate constant change with the change of the temperature?

In class, we discussed the following multiple-choice question. The rate expression for a reaction is: $$rate = k[X][Y]$$ Which statement is correct? A. As the temperature increases, the rate constant ...
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### How to derive the steady-state solution for simple two-step reaction with differential equations? [closed]

Consider this simple two step reaction, a variant of a Michaelis-Menten type of problem, where $\ce{A}$ and $\ce{B}$ reversibly bind to make $\ce{AB}$, and $\ce{AB}$ and $\ce{C}$ reversibly bind to ...
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### If a reactant appears on both sides of an elementary equation, can it be cancelled?

Me and a friend were debating the following. For the elementary reaction $$\ce{A + B -> A + C}$$ my friend says that it is unimolecular because $\ce{A}$ does not "participate" in the reaction. So,...
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### The reaction rate when the rate-determining step has a back reaction

For some reason, I am reviewing general chemistry and I find that the elementary reaction for the rate-determining step (RDS) is assumed to be irreversible, that is, single arrow, in all questions ...
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### Sum of a rate constant gives the total decay rate

I want to ask a question about the sum of a rate constant to yield the total decay rate. From previous studies, the rate of a reaction can be expressed evidently as $$\ce{v_{rate} = k[A]}$$ where ...
111 views

### Rate determining step in oxidation of alcohols using chromium-related compounds

I wanted to ask a question about the kinetics of an oxidation reaction using chromium reagents. I was given a lecture today on the mechanism of alcohol oxidations using Chromate (VI) reagents: My ...