The rate constant of reaction A+B →C is measured in two solution of ionic strength 0.36 M and 0.09 M. If the ratio of rate constant in two solution is 102, then the product of charges is 5 7
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- Identify the first chemical step in the production of Portland cement. How is this reaction related to the chemistry that takes place in the carbonation of concrete?Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?The label on a bottle of 3% (by volume) hydrogen peroxide, H2O2, purchased at a grocery store, states that the solution should be stored in a cool, dark place. H2O2decomposes slowly over time, and the rate of decomposition increases with an increase in temperature and in the presence of light. However, the rate of decomposition increases dramatically if a small amount of powdered MnO- is added to the solution. The decomposition products are H2O and O2. MnO2 is not consumed in the reaction. Write the equation for the decomposition of H2O2. What role does MnO2 play? In the chemistry lab, a student substituted a chunk of MnO2 for the powdered compound. The reaction rate was not appreciably increased. WTiat is one possible explanation for this observation? Is MnO2 part of the stoichiometry of the decomposition of H2O2?
- . Suppose that for the reaction 2N2O(g)+O2(g)4NO((g))it is determined, at a particular temperature, that the equilibrium concentrations arc [NO(g)]=0.00341M,[N2O(g)]=0.0293M, and [O2(g)]=0.0325M. Calculate the value of K for the reaction at this temperature.Does the stoichiometric ratio convey information about the actual quantity of reagents used? The role of a particular "ingredient" in a reaction might be deduced by the number of equivalents of that species used in the reaction. For example, how might you identify a catalyst based on the number of equivalents used?Does the rate constant for a reaction generally increase or decrease with an increase in reaction temperature?
- 1) The density of a metal, which has the BCC structure and one atom per lattice point, is 0.855 g/cm'. The atomic weight is 39.09 g/mol. Calculate the following (a) The fraction of the lattice points that contain vacancies and (b) The total number of vacancies in a cubic centimeter of the metal. (c) What is the activation energy required to create vacaneies in cal/mole at 720° e Engli19. Chemical Reactions A self-catalytic chemical reaction results in the formation of a compound that causes the formation ratio to increase. If the reaction rate V is modeled by V(x) = kx(a – x), 0sIsa where k is a positive constant, a is the initial amount of the compound, and x is the variable amount of the compound, for what value of x is the reaction rate a maximum?52-56. For the reaction 2N,O5(g) → 4NO,(g) + O2(g), the following data were collected: t (minutes) [N,O;] (mol/L) 1.24 x 10-2 10. 0.92 x 10-2 20. 0.68 x 10-2 30. 0.50 x 10-2 40. 0.37 x 10-2 50. 0.28 x 10-2 70. 0.15 x 10-2 52. The order of this reaction in N,O, is a) 0 b) c) 2 d) 3 1 none of these
- Assume that you have a solution of blue Cu2+ bound by water. You want to determine both the rate at which green CuCl2 is produced and the equilibrium constant between these two salts of copper(II) Please provide an outline of the experiment that you could perform to determine these values. Provide experimental steps in your outline, but describing exact volumes or quantities of chemicals is not necessary.For the reaction of the ammonium ion with nitrous acid, the net reaction is NH4*(aq) + HNO2(aq) → N2(g) + 2H2O() + H*(aq) If the initial concentration of nitrous acid is 1.00 M and, after 28.8 s has elapsed, the concentration of nitrous acid has fallen to 0.82 M, what is the average rate of the reaction over this time interval? 0.0063 M/s 0.028 M/s -0.0063 M/s -0.028 M/s O 0.063 M/sThe iodate ion is reduced by sulfite according to the followingreaction:IO3-(aq) + 3 SO32-(aq) -----> I-(aq) + 3 SO42-(aq)The rate of this reaction is found to be first order in IO3-,first order in SO32-, and first order in H+.(a) Write the rate law for the reaction.(b) By what factor will the rate of the reaction change ifthe pH is lowered from 5.00 to 3.50? Does the reactionproceed more quickly or more slowly at the lower pH?(c) Explain how the reaction can be pH-dependent even thoughH+ does not appear in the overall reaction.