The study of rates of chemical processes.
2
votes
1answer
32 views
integrated Rate Law graphs
why does the graph of ln[A] vs time produce a straight line for the first order rate law?
also why does the graph of time vs 1/B produce a straight line for the second order rate law?
0
votes
0answers
17 views
Estimating Surface Reactions - Liquid, Turbulent Flow
So, I need a method of estimating the influence of a surface (rate constant would do for a start), the idea is to estimate just Reactant + Surface -> Product in a turbulent liquid flow.
Now I am ...
0
votes
0answers
22 views
Michaelis Menten Deriviation for 2 Enzyme Substrates
We know that the Michaelis Menten derivation for the following reaction:
$\ce{E + S \rightleftharpoons ES -> E + P}$
Howver, what if the reaction took place in a different scenario whereby:
...
2
votes
0answers
39 views
Question Regarding the Chlorine Dioxide-Iodine-Malonic Acid Reaction
After reading a section on this particular oscillatory reaction, something started bugging me about it.
However, let me lay out the basis of my question. From what I've researched, Lengyel and ...
2
votes
1answer
64 views
Iodine clock with moving bands
Has anyone seen a version of the iodine clock reaction where instead of the system oscillating between clear and blue it shows blue bands travelling down the vessel?
I ask because someone not unknown ...
0
votes
1answer
42 views
Application of the Arrhenius equation to a parallel reaction
I'm struggling with this homework question:
"For a parallel reaction A goes to B with rate constant $k_1$ and A goes to C with rate constant $k_2$, you determine that the activation energies are 71.9 ...
1
vote
1answer
36 views
Difference between the terms “autocatalysis” and “(branching) chain reaction”
Is there a technical difference between the terms "autocatalysis" and "branching chain reaction"? They both seem to refer to something very similar, namely sequences of reactions in which one of the ...
4
votes
1answer
97 views
What are the factors controlling the fate of post-adhesed volatile molecules of the olfactory epithelium?
What happens to volatile molecules that reach the main olfactory epithelium in the nasal cavity after they bind and the neural stimulus fades?
To what extent do such factors as receptor kinetics and ...
1
vote
1answer
57 views
Integrated rate laws
My teacher gave us the equations for zero-order, first-order and second-order reactions as follows:
$$ [A]_t = -akt + [A]_0 $$
$$ \ln [A]_t=-akt+\ln [A]_0$$
$$\frac1{[A]_t}=akt+\frac1{[A]_0}$$
...
2
votes
0answers
55 views
Is there a bifurcation node in the potential energy as a function of reaction progress equation of chemical reactions?
I originally posted a similar question on math.stackexchange.com, but I believe I might have a better chance of having my question answered here after giving it some time.
I was thinking about ...
0
votes
0answers
25 views
How to calculate pH [closed]
I am preparing for an exam and I came across this exercise. I cannot find the proper solution.
It's about finding pH after mixing 20cm3 of CH3COOH and 19.8cm3 of NaOH (molar concentration is 0.2 for ...
4
votes
2answers
1k views
Difference between thermodynamic and kinetic stability
What is the difference between thermodynamic and kinetic stability? I'd like a basic explanation, but not too simple. For example, methane does not burn until lit -- why?
5
votes
1answer
96 views
A first-order reaction at infinite concentration
I have a first-order reaction, for the binding of two molecules, of the form: $\text{k}_\text{f} = \ce{k_1 (M*s)^{-1}}$. What happens at infinite concentration? How is this upperbound typically ...
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votes
0answers
39 views
Metal ions always catalyse Hydrolysis. Why?
When we use metal ions in hydrolysis, why do reactions become fast?
4
votes
1answer
73 views
Introduction to modeling chemical reactions
I am looking for introduction to modeling of chemical reactions. I think there is the base approach, where concentrations of chemical species are given, plus ratios of each possible reaction / ...
4
votes
4answers
232 views
Why are equilibrium constants unitless?
I haven't quite reached the point where I can read a full-fledged text on chemical kinetics and thermodynamics yet, so bear with me, please.
I'm wondering why a value like $K_{eq} = ...
3
votes
2answers
54 views
Why do collisions in elementary reactions of higher-orders appear to be more likely?
So we are told that a unimolecular elementary reaction has a rate law of $k[\text{A}]$ where a termolecular reaction with three unique reagents, $A$, $B$ and $C$ has a rate law of ...
4
votes
1answer
141 views
Algebra of conserved quantities for chemical reactions
So there is the standard formation enthalpy $\Delta H^0_f$ and there is also formation entropy.
Are there more (independent) quantities? What about the heat capacity? Is there a general theoretical ...
3
votes
0answers
61 views
Difference between non-thermal and thermal ionized gases
Why or when does non-thermal plasma become thermal? How do we know before hand if the ion temperature will differ from the electron temperature, on what parameters does it depend - where is the ...
2
votes
1answer
104 views
What is probability of 3 possible products, between two chemical species
I am not a chemicist, I hope I will be enough specific.
Suppose there are two chemical species A, B, with properties:
at temperature $t<T_r$, no reaction occurs between A, B (in any ...
7
votes
1answer
347 views
Definitions of autocatalysis
Is there a formal definition or algorithm that can take a list of reactions and tell me whether it contains a set of species that can produce itself autocatalytically?
It is clear that the following ...
8
votes
2answers
130 views
What's a minimal yet chemically-meaningful kinetic system for an oscillating reaction?
Oscillating reactions are a funny aspect of chemistry. I have tried to find various simplified kinetic models of oscillating reactions such as the Belouzov-Zhabotinsky, the Briggs–Rauscher or the ...
6
votes
2answers
420 views
Zero order reactions
I have come across many reactions that are zero order reactions but at one glance I'm unable to tell if they are zero order or not. Is there any criteria that can be used to identify these reactions ...
1
vote
0answers
121 views
Timescale of Protonation and Deprotonation across micelle layers
I am curious about the timescales of protonation and deprotonation of solvent systems. As a followup, how is this affected when the proton source is separated by an organic phase? For instance, it is ...
6
votes
2answers
637 views
Michael reaction or nucleophilic attack at the alpha carbon of an alpha-beta-unsaturated ketone?
What conditions promote a nucleophile to undergo the Michael reaction over the nucleophilic attack at the alpha carbon of the carbonyl group in an alpha-beta-unsaturated ketone? I'm looking for an ...
