Evaluate a proposed mechanism by checking that its elementary steps add up to the overall equation and that the slow step matches the rate equation, and distinguish intermediates (formed then consumed) from transition states on energy profiles.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Nitrogen monoxide reacts with chlorine in the atmosphere: 2 NO(g) + Cl2(g) → 2 NOCl(g) The rate equation was determined experimentally as Rate = k[NO]2[Cl2]. (i) A student proposed the following mechanism and suggested that Step 1 was the…
The reaction between nitrogen dioxide and fluorine has the overall equation: 2 NO2(g) + F2(g) → 2 NO2F(g) The reaction follows the energy profile shown: Two mechanisms are suggested: Which suggested mechanism is consistent with the energy profile? A. X…
The decomposition of hydrogen peroxide in the presence of iodide ions occurs in two steps. H2O2(aq) + I−(aq) → H2O(l) + IO−(aq) (slow) H2O2(aq) + IO−(aq) → H2O(l) + O2(g) + I−(aq) (fast) What is the role of I− in this mechanism? A.…
(i) State the products of the overall reaction. (ii) Sketch the energy profile for this reaction on the axes below. Label the reactants, the products, the transition states and the intermediate. (iii) Deduce the rate equation for the overall reaction.
Which species is an intermediate in the following reaction mechanism? NO2(g) + NO2(g) → NO3(g) + NO(g) NO3(g) + CO(g) → NO2(g) + CO2(g) A. NO2 B. NO3 C. NO D. CO2
The following mechanism has been proposed for the reaction between nitrogen(II) oxide and hydrogen. 2 NO(g) ⇌ N2O2(g) fast N2O2(g) + H2(g) → N2O(g) + H2O(g) slow Which rate equation is consistent with this mechanism? A.…
The energy profile of a reaction that occurs in two steps is shown. Which statement is correct? A. Q is a transition state, and the first step is rate-determining. B. Q is an intermediate, and the first step is rate-determining. C. Q is an intermediate, and…
The reaction takes place on the surface of a nickel catalyst. The following mechanism is proposed, in which Ni-C represents carbon atoms bonded to the nickel surface: CH4 + Ni → Ni−C + 2 H2 (slow) Ni−C + CO2 → Ni−CO + CO (fast)…
A reaction proceeds by the following mechanism. Step 1: NO2 + NO2 → NO3 + NO (slow) Step 2: NO3 + CO → NO2 + CO2 (fast) Which statement is correct about the reaction? A. The overall equation for the reaction is 2 NO2 → NO3 + NO B.…
The reaction between hydrogen and iodine monochloride has the overall equation H2(g) + 2 ICl(g) → I2(g) + 2 HCl(g) It proceeds by a two-step mechanism. H2 + ICl → HI + HCl (slow step) HI + ICl → I2 + HCl (fast step) What is the rate…
The reaction between nitrogen dioxide and carbon monoxide, NO2 + CO → NO + CO2, is proposed to take place by the following mechanism. Step 1 (slow): 2 NO2 → NO3 + NO Step 2 (fast): NO3 + CO → NO2 + CO2 What is the order of reaction with…
Which proposed mechanism for the following reaction is consistent with the rate equation? H2(g) + 2 ICl(g) → I2(g) + 2 HCl(g) rate = k[H2][ICl] A. One step: H2 + 2 ICl → I2 + 2 HCl B. Step 1 (slow): H2 + ICl → HI + HCl;…
A proposed mechanism for the reaction between nitrogen(II) oxide and hydrogen, which is overall exothermic, is shown. Which profile is consistent with this mechanism? A. Profile A B. Profile B C. Profile C D. Profile D
A proposed mechanism for the reaction between nitrogen monoxide and hydrogen is 2 NO(g) → N2O2(g) (fast) N2O2(g) + H2(g) → N2O(g) + H2O(g) (slow) N2O(g) + H2(g) → N2(g) + H2O(g) (fast) The overall reaction is exothermic. Which potential…
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