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# Questions tagged [kinetics]

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

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### How does the concentration of a reactant change? Is it based on individual order or overall order?

Reaction $\ce{A + B ->[$k$] C + D}$ follows the rate law $$r = k [\ce{A}]^{1/2}[\ce{B}]^{1/2}$$ where $k$ is given. Starting with $1 \,\pu{M}$ of $\ce{A}$ and $\ce{B}$ each, what is the time taken ...
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### How can a Michaelis–Menten formalism be used when enzyme concentration isn't constant?

I understand that $V_\mathrm{max} = k_3[\ce{E}]_0$ in ordinary Michaelis–Menten (MM) kinetics. According to the lecture notes provided by my university (I don't believe they are available online), ...
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### Understanding elementary rate laws from a probability stand point

I am learning about chemical kinetics and dynamics and as I understand for a general chemical reaction $$\ce{aA + bB -> cC + dD}$$ whose reaction rate, r, can be described by an elementary rate ...
24 views

### Is any significant product formed in the gas phase when reactants' concentrations are in the hundreds of ppm?

Title says it all. I am evaluating the chance that the IR signal of a mixture of gases changes due to their reaction with each other. Keep in mind that they are in the 3-3000 ppm range and include a ...
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### Parabolic Arrhenius plot

I am currently doing a kinetic study on an enzyme catalysed reaction and plotting the Arrhenius graph ($\ln k$ vs $1/T$) I got a parabola. My idea is to take the derivative at each point, meaning ...
80 views

### Frequency to induce nitrogen inversion

I would like to know how to compute the frequency at which nitrogen inversion happens in ammonia gas at STP. The activation energy for such process is 24.2 kJ/mol, therefore I thought that it is ...
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### Differentiating random and ordered sequential mechanisms in enzyme kinetics

Can random and ordered sequential mechanisms be descern by Lineweaver-Burk plot? Why or why not? Because for orederd sequential mechanism I got different LB plot depending on which substrate is held ...
1 vote
138 views

### Why reaction rate has to be necessarily positive?

I read in my book that negative rates do not have any significance. Can't we interpret negative rate simply as decrease in concentration of reactant? What's wrong with that and why do we put an ...
1 vote
80 views