Zadania z chemii IB HL

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Filtry i umiejętności1

In the first step, manganese(III) ions formed from the manganate(VII) are complexed by ethanedioate ions. $\ce{[Mn(H2O)6]^3+(aq) + 2C2O4^2-(aq) -> [Mn(C2O4)2(H2O)2]^-(aq) + 4H2O(l)}$

(i) Deduce the oxidation state of carbon in

\ce{[Mn(C2O4)2(H2O)2]^-}

. (ii)…

(i) Concentrated sulfuric acid, $\ce{H2SO4}$ , is used as the catalyst in the manufacture of propyl ethanoate. Explain how the catalyst affects the reaction. (ii) The conversion of propane into 1-bromopropane, $\ce{C3H8(g) + Br2(g) -> CH3CH2CH2Br(g) + HBr(g)}$ …

(i) Sketch the Maxwell–Boltzmann energy distribution curve for the particles in this reaction mixture at 25 °C, marking on the diagram the activation energy both with and without the catalyst. (ii) On the same axes, sketch and label a second Maxwell–Boltzmann…

The forward reaction is endothermic, uses platinum as a catalyst, and takes place at 800 K. Sketch the reaction's energy profile both with and without the catalyst present, labelling the activation energies and $\Delta H$ .

Which of the following correctly describes the effect of a catalyst on a reaction? A. It increases the frequency of collisions between reactant particles B. It increases the proportion of collisions with energy greater than or equal to the activation energy C.…