(a)
Interpretation: The energy diagram for the concerted reaction with
Concept introduction: The reactions in which product are formed by the breaking and making of bonds in a single step are known as concerted reactions. The activation energy
(b)
Interpretation: The energy diagram for a two-step reaction,
Concept introduction: The reactions in which product are formed by the breaking and making of bonds in a single step are known as concerted reactions. The activation energy
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ORGANIC CHEMISTRY
- Consider the following reaction: (a) The rate law for this reaction is first order in NO₂(g) and first order in O3(g). What is the rate law for this reaction? O Rate = k [NO₂(g)] [03(9)] Rate = k [NO₂(g)]² [03(9)] O Rate = k [NO₂(g)] [03(9)]² O Rate = k [NO₂(g)]² [03(g)]² Rate = k [NO₂(g)] [03(g)]³ Rate = k [NO₂(g)]4 [03(9)] (b) If the rate constant for this reaction at a certain temperature is 73200, what is the reaction rate when [NO₂(g)] = 0.973 M and [O3(9)] = 1.42 M? Rate = 2 NO₂(g) + 03(g) → N₂05(9) + O₂(g) M/s. Rate = (c) What is the reaction rate when the concentration of NO₂(g) is doubled, to 1.95 M while the concentration of O3(g) is 1.42 M? M/sarrow_forwardThe rate law of a reaction is given below.From the given rate law, what will happen to the reaction time and reaction rate if the concentration of one of the reactants is doubled while keeping everything the same? why?Also, why the starch solution used as an indicator in an experiment turned blue at the end of the reaction?arrow_forwardrate law for hte reaction : RX + H20→ R0H + HX , rate =K[RX]. the rate of reaction will be doubled when: (a) concentration of H2O is doubled (b)concentration of RX is reduced to half (c) concentration of RX is doubled (d) none of these also give reason for your answerarrow_forward
- Given a reaction between an organic molecule, denoted as A, and NaSH, we observe the following observations. Using the observations, write a rate law for the reaction.(a) The rate triples when the concentration of [A] is tripled and the concentration of [NaSH] is held constant.(b) The rate is decreased when the concentration of [A] is doubled and the concentration of [NaSH] is cut by a factor of 3.(c) The rate doubles when the concentration of [A] is cut in half and the concentration of [NaSH] is quadrupled.(d) The rate increases with an increase in temperature. write the rate lawarrow_forwardDraw the appropriate fishhook arrows for the following reaction, and label each step with one of the following (homolytic bond cleavage, addition to a pi bond, hydrogen abstraction, halogen abstraction, elimination, coupling): ·Br: Н— Вг -Br Br -Br ·Br:arrow_forwardDetermine whether the following statements are true or false, and explain your answer in one sentence. a) The rate law for an overall reaction 2A (g) -> B (g) is: Rate = k[A]^2 b) The rate law for an elementary step 2A (g) -> B (g) is: Rate = k[A]^2 c) The rate of an overal reaction is the rate of the slowest elementary step within its mechanism.arrow_forward
- The reaction O₂(g) + 2 NO(g) → 2 NO₂(g) was studied at a certain temperature with the following results: (a) What is the rate law for this reaction? O Ratek [0₂(9)] [NO(g)] O Ratek [0₂(9)]² [NO(g)] O Rate = k [0₂(9)] [NO(g)]² O Ratek [0₂(9)]² [NO(g)]² O Ratek [0₂(9)] [NO(g)]³ O Rate = k [O₂(g)]* [NO(g)] (b) What is the value of the rate constant? Experiment [0₂(9)] (M) 0.0235 0.0235 0.0470 0.0470 [NO(g)] (M) 0.0235 0.0470 0.0235 0.0470 Rate (M/S) 0.158 0.633 0.317 1.27 (c) What is the reaction rate when the concentration of O₂(g) is 0.0318 M and that of NO(g) is 0.0649 M if the temperature is the same as that used to obtain the data shown above?arrow_forwardAssume that the formation of nitrogen dioxide: 2NO(g) + O2(g) 2NO2(g) is an elementary reaction. (a) Write the rate law for this reaction. (b) A sample of air at a certain temperature is contaminated with 2.0 ppm of NO by volume. Under these conditions, can the rate law be simplified? If so, write the simplified rate law. (c) Under the conditions described in part (b), the half-life of the reaction has been estimated to be 6.4 × 103 min. What would the half-life be if the initial concentration of NO were 10 ppm?arrow_forward(9) The reaction 2A → B+C (molecular weight of A = 150.0 amu; B = 75.0 amu) has a rate constant of 0.112 s¹. (a) If the initial concentration of A is 0.200 M, what is the mass (in grams) of A that are left after 2.00 s when the reaction is run in a 2.00 L flask? (b) What is the mass (in grams) of B that are produced in the reaction?arrow_forward
- Assume that the formation of nitrogen dioxide, 2 NO(g) + 02(g) – 2 NO2(g) is an elementary reaction. (a) Write the rate law for this reaction. (Rate expressions take the general form: rate = k. [A]ª . [B]b.) chemPad О Help Greek - rate=k•[NO]2.[02] rate=k*[NO]^2*[O_2] Correct. (b) A sample of air at a certain temperature is contaminated with 1.9 ppm of NO by volume. Under these conditions, can the rate law be simplified? If so, write the simplified rate law. If not, repeat your answer from above. (Rate expressions take the general form: rate = k . [A]ª . [B]b. Use k' for the new rate constant as needed.) chemPad O Help Greek - rate=k':[NO]2 rate=k*[NO]^2 Correct. (c) Under the conditions described in (b), the half-life of the reaction has been estimated to be 6.7x103 min. What would the half-life be if the initial concentration of NO were 12.4 ppm? 4.0 |1030192 X min Supporting Materials Periodic Table Constants and E Supplemental Dataarrow_forward1a) Ea is 14.0 kJ/mol, for the uncatalyzed reaction: O3(g) + NO(g)--> NO2(g) + O2(g) Slow NO2(g) + O(g)--> NO(g) + O2(g) Fast (uncatalyzed reaction) Overall reaction: O3(g) + O(g)--> 2O2(g) Ea for the same reaction, when catalyzed as above, is 11.9 kJ/mol.At -37°C, what is the ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction?(Assume the frequency factor A is the same for each reaction.) 1b) One of the concerns about the use of freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the reaction CCl2F2 --> CF2Cl + Cl (photolysis of Freon-12) Chlorine atoms can also act as a catalyst for the destruction of ozone.The activation energy for the reaction Cl + O3 --> ClO + O2 is 2.1 kJ/mol. Cl is regenerated by the fast reaction ClO + O --> O2 + Cl If the frequency factors are the same and both catalysts are in equal concentration, how many times faster,…arrow_forwardExperiments show that each of the following redox reac-tions is second order overall:Reaction 1: NO₂(g)+CO(g) →NO(g)+CO₂(g) Reaction 2: NO(g)+O₃(g) →NO₂(g)+O₂(g) (a) When [NO₂] in reaction 1 is doubled, the rate quadruples.Write the rate law for this reaction.(b) When [NO] in reaction 2 is doubled, the rate doubles. Writethe rate law for this reaction.(c) In each reaction, the initial concentrations of the reactantsare equal. For each reaction, what is the ratio of the initial rateto the rate when the reaction is 50% complete?(d) In reaction 1, the initial [NO₂] is twice the initial [CO].What is the ratio of the initial rate to the rate at 50% completion?(e) In reaction 2, the initial [NO] is twice the initial [O₃]. Whatis the ratio of the initial rate to the rate at 50% completion?arrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningPhysical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,