Construct and interpret energy profiles for reactions with two or more steps, marking each transition state and intermediate, identifying the rate-determining step as the one with the highest activation energy, and reading ΔH from the diagram.
Tę umiejętność sprawdza 9 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Which statements describe the activation energy of a reaction? I. The minimum energy that colliding particles must have in order to react II. The energy difference between the reactants and the transition state on an energy profile III. The energy difference…
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…
In the first step, manganese(III) ions formed from the manganate(VII) are complexed by ethanedioate ions. [Mn(H2O)6]3+(aq) + 2 C2O42−(aq) → [Mn(C2O4)2(H2O)2]−(aq) + 4 H2O(l) (i) Deduce the oxidation state of carbon in [Mn(C2O4)2(H2O)2]−. (ii)…
(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.
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 diagram shows the enthalpy profile of an exothermic reaction. Arrows I, II and III show energy differences on the profile. Which expression gives ΔH for the forward reaction? A. II − I B. I − II C. I + II D. III − II
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…
Which energy profile diagram represents an exothermic SN2 reaction of a primary halogenoalkane with a nucleophile? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
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