# Questions tagged [rate-equation]

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### Pseudo rate equation for catalyzed decompostion of hydrogen peroxide

I am conducting an experiment in which I will be adding a catalyst to a solution of Hydrogen peroxide and will measure its concentration over a range of time by taking samples of the solution every $5$...
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### Can the overall order of a reaction ever be strictly less than $1$?

In A-level chemistry we are taught that: To every reaction: $$\sum_{i=1}^n c_iA_i\to\sum_{j=1}^m d_jB_j$$There is a rate equation: $$r=\kappa[A_1]^{\alpha_1}[A_2]^{\alpha_2}\cdots[A_n]^{\alpha_n}$$...
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### Calculating ionic strength at different concentrations

Zn$^{2+}$ reacts with a molecule, B, in a solution at several different concentrations of NaCl. Determine the charge of the biomolecule and k$_0$ (second order) ​​(assume that Zn$^{2+}$ does not ...
Below are four reactions, to this experiment inhibitor is added so that k$_3$ = $0$ (but the other reactions are unaffected) calculate [D] when the reaction is over. The initial concentration of A is $... 0 votes 1 answer 2k views ### Why is it that first order reactions never end? [duplicate] I'm studying chemical kinetics in high school. We are studying Integrated Rate Equation of first order reactions - their derivations and graphs. Our teacher showed us a graph of: Concentration of ... 1 vote 1 answer 345 views ### How to calculate rate of carbon dioxide from rate equation? [closed] The concentration of carbon dioxide that changes with time: $$\ce{CO2(g) + H2O(l) <=>[k_\mathrm{fwd}][k_\mathrm{rev}] HCO3-(aq) + H+(aq)}$$ How to calculate the integral for the following ... 0 votes 0 answers 33 views ### Can two 1st order reactants in an overall 2nd order reaction have different rates? I've recently done a saponification reaction of ethyl acetate with sodium hydroxide and used the initial rates method to find the order of reaction. (I change the concentration of one reactant and ... -1 votes 1 answer 191 views ### Rate equation for the decomposition of hydrogen peroxide with iron(III) chloride as catalyst [duplicate] I am trying to determine the activation energy of the decomposition of hydrogen peroxide with iron(III) chloride added as a catalyst. To do that, I need to find the rate constant, but I am not sure ... 3 votes 2 answers 304 views ### Does 'k' in the rate law change with a change in volume I'm a high school AP Chem student and we recently learned about the rate law and the Arrhenius equation. In school, we learned that rate constant 'k' is only changed with temperature or catalyst. ... -1 votes 1 answer 627 views ### Rate of Reaction - Potassium Permanganate and Hydrogen Peroxide I'm interested in an aerospace project that requires I know the reaction rate ($[\pu{M/s}]$) of, $$\ce{2 KMnO4 (aq) + 3 H2O2 (aq) -> 3 O2 (g) + 2 MnO2 (s) + 2 KOH (aq) + 2H2O (l)}.$$ I'm just ... 10 votes 1 answer 279 views ### Are there any genuine, elementary ternary reactions? Macroscopically, reaction rates can be of varied order. But mechanistically, most reactions are first-order or second-order/binary (e.g. SN2, many catalyst surface reactions, dimers). Most processes ... -1 votes 1 answer 934 views ### Writing rate of disappearance and rate of appearance using rate law [closed] I have studied that rate of disappearance and rate of appearance is the change in concentration of reactants and products (respectively) with respect to time. Thus, $$\text{ROD} = -\frac{\Delta c_R}{\... 0 votes 0 answers 974 views ### Assuming 2O3 (g) → 3O2 (g), how much oxygen will be formed within 5.50 s for a reaction rate of 0.250 M/s? Context: The rate of appearance of \ce{O2} in the reaction: \ce{2O3 (g) -> 3O2 (g)} is \pu{0.250 M/s}. So, over the first \pu{5.50 s}, will it form \pu{1.38 M}, or \pu{4.13 M} of oxygen ... -1 votes 2 answers 1k views ### What is the rate law of a reaction: 2A + 3B → products? [closed] Update: I found out that the coefficients of the chemical reaction are not the exponents in the rate law. It is actually the order of the species during the reaction. It is known that in the reaction, ... 0 votes 1 answer 129 views ### Problem understanding the rate of reaction of reversible reactions Case 1:$$\ce{CH_3COOH + NaOH<=>CH_3COONa + H_2O}$$At equilibrium, there remain extremely small concentrations of the reactants (acetic acid and sodium hydroxide), and comparatively large ... 3 votes 0 answers 38 views ### The Mechanism of Termolecular Reactions How does a termolecular elementary reaction happen under the law of mass action? My physical chemistry textbook only says details about bimolecular and unimolecular reactions with collision theory. I ... 0 votes 1 answer 634 views ### Can an elementary reaction have zero order? I am very confused right now about my approach to this question could somebody help me out with this. I reasoned my answer as given below Let's assume if a complex reaction is of zero order. It ... 0 votes 1 answer 366 views ### Calculate concentration of product after time passed If I have two parallel reactions: A --> P$1$(k$_1$=$0.00010$s$^{-1}$) A --> P$2$(k$_2$=$0.00050$s$^{-1}$) and know that the initial concentration of A is$0.0417$M. How can I ... 1 vote 0 answers 184 views ### Determining reaction order from absorbance A reaction is initiated in a solution which contained a dissolved component. The transmittance was measured at$\pu{240 nm}$in a$\pu{2.54 cm}$long cell. At$t = 0$the transmittance was$1$.$\...
I am given the following data: The rate constant $k$ at $\pu{25 ^\circ C}$ in a reaction of persulfate ions and iodide ions in a water solution is assumed to vary with the total ionic strength of the ...