Homework Answers
1) elementaory steps must sum to the netreaction
2)the rate law of the net reaction must match the rate law of the slowest steps
these are two criteria must meet mechanism option 1 and 4 are correct
2)in the graph rate limting step is B.....> C due to high threshold engery option 2 is correct
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What two criteria must a plausible mechanism meet? Select both criteria in the options. elementary steps...
A reaction mechanism is defined as the sequence of reaction steps that define the pathway from...
A reaction mechanism is defined as the sequence of reaction steps that define the pathway from reactants to products. Each step in a mechanism is an elementary reaction, which describes a single molecular event of usually one or two molecules interacting. The rate law for an overall reaction is the rate law for the slowest step in the mechanism, which is directly related to the stoichiometric coefficients of the reactants. The exception to this rule occurs when the slowest step...
Which statement is false concerning elementary steps in a reaction mechanism? the rate law can be...
Which statement is false concerning elementary steps in a reaction mechanism? the rate law can be deduced from the stoichiometry of reactants for an elementary step the overall molecularity for an elementary step is the sum of the stoichiometric coefficients for all reactants in that step the rate law for an elementary step must be determined experimentally the rate law for the overall reaction is always the same as the rate law for the slowest elementary step both (c) and...
Which statement below concerning elementary processes (or steps), the mechanism of a reaction and the overall...
Which statement below concerning elementary processes (or
steps), the mechanism of a reaction and the overall reaction is
correct?
The overall rate law derived from the mechanism must agree with
the observed rate law for the overall reaction.
The rate law for an elementary process can be predicted from
the chemical equation for that process.
The rate law for the rate determining step is directly related
to the rate law for the overall reaction.
All the above statements are either...
When a graph of energy vs, reaction progress was graphed for the reaction A + B...
When a graph of energy vs, reaction progress was graphed for the reaction A + B rightarrow C + D, the following data was obtained: a) Draw a rough sketch of what this activation energy diagram looks like. Make sure axes and points are labeled appropriately. B) What is the numerical value of the activation energy obtained from the graph? c) Are reactants or products more stable? d) Is the reaction endothermic or exothermic? Explain. d) On the graph you...
2. Consider this two step mechanism for a reaction… Step 1 NO2 + O3 --> NO3 ...
2. Consider this two step mechanism for a reaction… Step 1 NO2 + O3 --> NO3 + O2 slow; rate determining step Step 2 NO3 + NO2 --> N2O5 fast a. What is the overall reaction? b. Identify the intermediates in the mechanism. c. Write the rate law expression for each step of the mechanism including any reversible reactions. c. What is the predicted rate law expression? Be sure to only list reactants from the overall equation and not intermediates...
To understand how elementary steps make up a mechanism and how the rate law for an...
To understand how elementary steps make up a mechanism and how the rate law for an elementary step can be determined. Very often, a reaction does not tell us the whole story. For instance, the reaction NO2(g)+CO(g)→NO(g)+CO2(g)NO2(g)+CO(g)→NO(g)+CO2(g) does not involve a collision between an NO2NO2 molecule and a COCO molecule. Based on experimental data at moderate temperatures, this reaction is thought to occur in the following two steps: NO2(g)+NO2(g)→NO3(g)+NO(g)NO2(g)+NO2(g)→NO3(g)+NO(g) NO3(g)+CO(g)→CO2(g)+NO2(g)NO3(g)+CO(g)→CO2(g)+NO2(g) Each individual step is called an elementary step. Together, these...
8. (20 points) Consider the following mechanism, with the accompanying energy diagram, which has been suggested...
8. (20 points) Consider the following mechanism, with the accompanying energy diagram, which has been suggested for the following overall reaction in the presence of a Cl catalyst: 03 +0 202 Step 1: Step 2: 03 + Cl → OCl + O2 OCl + 0 + 02 + Cl +---Ea, Energy - - - - AHrxn --- - Reaction progress- A. Based on the energy diagram, which step is rate limiting? Which step is the fastest? (4 Points) B. Identify...
Can you please answer the following questions? The rate constant, k for the reaction below A...
Can you please answer the following questions?
The rate constant, k for the reaction below A - Products is 2.8 x 10 sat 80°C. If the initial concentration of A is 0.25M, what is the concentration after 50 s? The oxidation reaction of thallium (I) by cerium (IV) is believed to occur via three steps. The rate low for the reaction is: rate = k[Ce [Mn2") ce". Mne - Cen ! ce". Mn. Cell. Mn TI". Mn* - TI. Mn?...
Consider the recombination reaction: 2 Br(g) Br2 (8) The mechanism involves two elementary steps. The first...
Consider the recombination reaction: 2 Br(g) Br2 (8) The mechanism involves two elementary steps. The first step results in formation of an energized Bra molecule, the excess energy carried by Bris then transferred to a molecule M for subsequent formation of Bry in the second step First step: 2 Br (8) Bry* () + M ) Brz* () Brz () +M() Second step: By the steady-state approximation and work out an expression for d[Brydr in term of k, k., ky...
03 (5 marks) : propose a two-step (elementary) mechanism for the reaction: 2NO2(g) + F2(g) →...
03 (5 marks) : propose a two-step (elementary) mechanism for the reaction: 2NO2(g) + F2(g) → 2NO:F and·how that the chosen mechanism is consistent with the rate law = k!NollFJ. Hint, steady state approximation must be considered レ- Show your work
Which statement below concerning elementary processes (or
steps), the mechanism of a reaction and the overall reaction is
correct?
The overall rate law derived from the mechanism must agree with
the observed rate law for the overall reaction.
The rate law for an elementary process can be predicted from
the chemical equation for that process.
The rate law for the rate determining step is directly related
to the rate law for the overall reaction.
All the above statements are either...
When a graph of energy vs, reaction progress was graphed for the reaction A + B rightarrow C + D, the following data was obtained: a) Draw a rough sketch of what this activation energy diagram looks like. Make sure axes and points are labeled appropriately. B) What is the numerical value of the activation energy obtained from the graph? c) Are reactants or products more stable? d) Is the reaction endothermic or exothermic? Explain. d) On the graph you...
8. (20 points) Consider the following mechanism, with the accompanying energy diagram, which has been suggested for the following overall reaction in the presence of a Cl catalyst: 03 +0 202 Step 1: Step 2: 03 + Cl → OCl + O2 OCl + 0 + 02 + Cl +---Ea, Energy - - - - AHrxn --- - Reaction progress- A. Based on the energy diagram, which step is rate limiting? Which step is the fastest? (4 Points) B. Identify...
Can you please answer the following questions?
The rate constant, k for the reaction below A - Products is 2.8 x 10 sat 80°C. If the initial concentration of A is 0.25M, what is the concentration after 50 s? The oxidation reaction of thallium (I) by cerium (IV) is believed to occur via three steps. The rate low for the reaction is: rate = k[Ce [Mn2") ce". Mne - Cen ! ce". Mn. Cell. Mn TI". Mn* - TI. Mn?...
Consider the recombination reaction: 2 Br(g) Br2 (8) The mechanism involves two elementary steps. The first step results in formation of an energized Bra molecule, the excess energy carried by Bris then transferred to a molecule M for subsequent formation of Bry in the second step First step: 2 Br (8) Bry* () + M ) Brz* () Brz () +M() Second step: By the steady-state approximation and work out an expression for d[Brydr in term of k, k., ky...
03 (5 marks) : propose a two-step (elementary) mechanism for the reaction: 2NO2(g) + F2(g) → 2NO:F and·how that the chosen mechanism is consistent with the rate law = k!NollFJ. Hint, steady state approximation must be considered レ- Show your work
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