Questions tagged [kinetics]

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

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Chemistry volume question [closed]

*Oxygen has 24 dm3 of volume at room temperature and pressure 1)What would happen to this volume of gas in terms of the kinetic theory if the pressure is kept decreased and the temperature is ...
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In the termination step of radical chain reaction, we often neglect the recombination of hydrogen atom radicals and it will not be included in the mechanism. Let say the reaction is between $\ce{H2}$ ...
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Which alkene reacts faster with HCl?

Which alkene reacts faster with HCl? The logic tells me the most stable alkene 2 which is the most substituted would react the slowest. On the other hand, it would form the most stable tertiary ...
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Why does According to Le-Chateliers principle, adding heat to solid and liquid in equilibrium will cause the amount of solid to decrease

According to Le Chatelier's Principle the external changes must be counteracted but in this scenario the external factors causes the amount of solid to decrease because of obviously melting but if Le ...
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How does the rate constant vary double by doubling the concentration of a reactant?

Rate law for the reaction, $\ce{A +2B-> C}$ is found to be, Rate $\mathrm{=k[A][B]}$ The concentration of reactant $\ce{'B'}$ is doubled, keeping the concentration of $\ce{'A'}$ constant, the value ...
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Should rates and rate constants be expressed in terms of pressure or concentration?

If an elementary reaction was conducted in the gaseous phase, say $$\ce{X (g) -> Y(g)},$$ would the formal definition of the rate law be $\mathrm{rate} = kP_\ce{X}$ or $\mathrm{rate} = k[\ce{X}]$?
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Lindemann-HInshelwood mechanism difference between high and low concentration

I have a gas reaction which follows the Lindemann-Hinshelwood mechanism and want to calculate the rate constant at low and at high concentrations of the gas but I find myself stuck at what my next ...
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How can you qualitatively tell when the hydrolysis of aspirin is over?

I'm doing an experiment on the effect of temperature on the time taken to produce acetic acid and salicylic acid. Are there any qualitative observations I can make about when the reaction has finished?...
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Lindemann–Hinshelwood mechanism for a gas reaction

The effective rate constant for a gaseous reaction which proceeds by a Lindemann–Hinshelwood mechanism is $\pu{1.01E-5 s^-1}$ at a concentration of $\pu{4.6E-6 M}$ and $\pu{2.21E-5 s^-1}$ at a ...
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What is the activation energy of the landolt reaction (iodate variation of the iodine clock reaction)? [duplicate]

I cannot find it anywhere for the life of me. If you can help me in anyway whatsoever even imply guiding me to something useful I would appreciate it greatly.
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Is the rate of a zero order reaction always independent of the concentration of its reactants?

Consider the following reaction : $\ce{A + B}$ $\rightarrow$ $\ce{Products}$ where order of the reaction w.r.t. $\ce{A}$ is $-1$ and order of the reaction w.r.t. $\ce{B}$ is $+1$. So, overall order of ...
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Why on changing temperature of a reaction its activation energy and pre-exponenetial factor do not change significantly?

My teacher told me that on changing temperature of a reaction, its activation energy ($E_{a}$) and pre-exponenetial factor ($A$) do not change significantly and hence we can assume them to be constant ...
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What is the literature value of the activation energy of the reaction between iodate and bisulfite?

I explored the Arrhenius equation using the reaction between potassium iodate (containing the IO3- iodate ion) and sodium metabisulfite (bisulfite ion), however I can't find a literature value to draw ...
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Why catalyst does not alter the entropy of a reaction?

In my textbook it is written that "Catalyst does not alter the entropy of a reaction". But why? There is literally no explanation given in my textbook as to why this is true. Could you ...
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Why is the variable on the y-axis of Maxwell's Speed Distribution Curve 'fraction of molecules'?

I came across the following graph in my textbook showing the kinetic energy distribution of the gas molecules in a gas sample. Now, the thing is the textbook is telling that the area under the curve ...
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Finding half-life of a nuclide based on gas release

Full Question: The hydride of an unstable nuclide of a Group IIA metal, $\ce{MH2 (s)}$, decays by alpha emission. A $\pu{0.025 mol}$ sample of the hydride is placed in an evacuated $\pu{2.0 L}$ ...
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Confusion in thermodynamically and Kinetically controlled reaction

I am confused in following reaction: $\ce{(CH3)2CH-CHO}$ when reacts with conc. $\ce{NaOH}$, will it undergo cannizaro reaction? According to our professor, It can undergo both Cannizzaro as well as ...
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If all molecules have basically the same KE at a given temperature, why do lighter isotopes evaporate more readily?

One of the proxies used for paleoclimate is the ratio of oxygen-18 to oxygen-16 in ice cores and in sedimentary rocks. The idea is that water molecules with oxygen-18 generally evaporate less readily ...
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Finding rate constant from a change in pressure experiment

I measured the change in pressure for the decomposition of hydrogen peroxide in the presence of a manganese(IV) oxide catalyst at 5 different temperatures: \ce{2 H2O2 (l) ->[MnO2 (s)] O2 (g) + 2 ...
$\pu{250 mL}$ of a waste solution obtained from the workshop of a goldsmith contains $\pu{0.1 M}$ $\ce{AgNO3}$ and $\pu{0.1 M}$ $\ce{AuCl}$. The solution was electrolyzed at $\pu{2 V}$ by passing a ...