Deducing rate equations from experimental data

Deduce the order with respect to each reactant and the rate equation from initial-rate data by comparing experiments in which one concentration changes, and explain why rate equations follow from the mechanism and must be found experimentally.

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Zadanie 1dPaper 2, maj 2025, TZ2
wzorowane4 pktotwarteśrednie (szac.)

Cyanide ions react with bromoethane, CHX3CHX2Br\ce{CH3CH2Br}. (i) Draw the full structural formula of the organic product of this reaction. (ii) Predict which mechanism, SN1\mathrm{S_N1} or SN2\mathrm{S_N2}, operates in this reaction, and give a reason for your choice.…

Zadanie 27Paper 1A, maj 2025, TZ2
wzorowane1 pktzamknięteśrednie (szac.)

The rate of the reaction between propanone and iodine in acidic solution was measured at a fixed concentration of the acid catalyst. CHX3COCHX3(aq)+IX2(aq)CHX3COCHX2I(aq)+HI(aq)\ce{CH3COCH3(aq) + I2(aq) -> CH3COCH2I(aq) + HI(aq)} [CHX3COCHX3][\ce{CH3COCH3}] / moldm3\mathrm{mol\,dm^{-3}} [IX2][\ce{I2}] /…

Zadanie 26Paper 1A, listopad 2025, TZ3
wzorowane1 pktzamknięteśrednie (szac.)

The following mechanism has been proposed for the reaction between nitrogen(II) oxide and hydrogen. 2NO(g)NX2OX2(g)\ce{2NO(g) <=> N2O2(g)} fast NX2OX2(g)+HX2(g)NX2O(g)+HX2O(g)\ce{N2O2(g) + H2(g) -> N2O(g) + H2O(g)} slow Which rate equation is consistent with this mechanism? A.…

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