Arrhenius equation and temperature dependence of k

Chemia IBPaper 2, maj 2026, TZ2wzorowane3 pktotwarteśrednie (szac.)

Zadanie 6c

Outline how the activation energy, E_a, of this reaction could be found, without describing the apparatus or the procedure.

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 29

A graph of ln k against 1/T for a reaction is a straight line, as predicted by the Arrhenius equation: $k = A\,e^{-E_\mathrm{a}/RT}$ What is the gradient of the line? A. E_a/R B. −E_a/R C. ln A D. −E_a

Chemia IBPaper 2, maj 2025, TZ2wzorowane12 pktotwarteśrednie (szac.)

Zadanie 3b

In moist air carbonyl dibromide is slowly hydrolyzed: Br₂CO(g) + H₂O(g) → CO₂(g) + 2 HBr(g) (i) Suggest a method of monitoring the progress of this reaction at constant temperature so that its rate can be determined. (ii) Outline two reasons why a…

• Materiał graficzny

Chemia IBPaper 1A, maj 2025, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 31

The reaction between sodium thiosulfate and hydrochloric acid was carried out at several temperatures to determine its activation energy. A graph of ln k against $\dfrac{1}{T}$ was plotted from the processed data, and the gradient of the line of best fit…

• Materiał graficzny

Chemia IBPaper 2, listopad 2025, TZ3wzorowane5 pktobliczeniowetrudne (szac.)

Zadanie 3d

The forward reaction is first order with respect to cyclohexane. C₆H₁₂(g) ⇌ C₆H₆(g) + 3 H₂(g) (i) Sketch a graph showing how the rate varies with the concentration of cyclohexane. (ii) Deduce the reaction's rate equation, and state the units of the…

• Materiał graficzny

Chemia IBPaper 1, maj 2024, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 21

Which statement is correct for the Arrhenius equation? $k = A\,e^{-E_\mathrm{a}/RT}$ A. As the temperature increases, the value of $e^{-E_\mathrm{a}/RT}$ increases. B. At a given temperature, k increases as E_a increases. C. A is the minimum…

Chemia IBPaper 1, maj 2024, TZ2wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 22

The graph shows plots of ln k against $\dfrac{1}{T}$ for two reactions, X and Y. Both lines are extended to the vertical axis. Considering the Arrhenius equation $\ln k = \ln A - \dfrac{E_\mathrm{a}}{RT}$, which combination is correct for reactions X and Y?…

• Materiał graficzny

Chemia IBPaper 1, listopad 2024wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 20

The rate constant, k, of a reaction was measured at several temperatures. A graph of ln k against 1/T (with T in kelvin) is a straight line with a gradient of −5.2 × 10³ K.…

• Materiał graficzny

Chemia IBPaper 2, maj 2023, TZ1wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 8

The rate constant, k, for the alkaline hydrolysis of ethyl ethanoate was determined at several temperatures. The processed data are shown in the graph. Determine the activation energy for this reaction, stating the units. Use sections 1 and 2 of the data…

• Materiał graficzny

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 9b

The rate of a different reaction at 45 °C is four times its rate at 25 °C. Calculate the activation energy, in kJ mol⁻¹, for this reaction, using sections 1 and 2 of the data booklet.

Chemia IBPaper 2, listopad 2023, TZ1wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 6c

The rate constant of a reaction increases by a factor of 2.5 when the temperature is raised from 30 °C to 40 °C. Deduce the activation energy of the reaction, in kJ mol⁻¹. Use sections 1 and 2 of the data booklet.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 6c

The rate constant of a reaction at 40 °C is 2.5 times its value at 30 °C. Deduce the activation energy of the reaction, in kJ mol⁻¹. Use sections 1 and 2 of the data booklet.

Chemia IBPaper 1, listopad 2023, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 22

The temperature of a reaction mixture is raised from 300 K to 320 K and nothing else is changed. Which quantity increases? A. Activation energy, E_a B. Rate constant, k C. Standard enthalpy change of the reaction, ΔH^⊖ D. Order of…

Chemia IBPaper 1, listopad 2023, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

The temperature of a reaction mixture is raised and no catalyst is used. Which quantity changes, even though it does not depend on the concentrations of the reactants? A. Rate of reaction B. Order of reaction C. Rate constant D. Activation energy

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 21

The rate constant, k, of a reaction was measured at several temperatures, and ln k was plotted against $\dfrac{1}{T}$, where T is the temperature in kelvin. Two points on the line of best fit are marked on the graph.…

• Materiał graficzny

Chemia IBPaper 1, maj 2022, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 21

In the Arrhenius equation, $k = A e^{-E_\mathrm{a}/RT}$, which statement about the factor A is correct? A. It is the minimum energy needed for a successful collision. B. It is related to the frequency of collisions with the proper orientation. C. It is the…

Chemia IBPaper 1, listopad 2022wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 21

The Arrhenius equation relates the rate constant, k, of a reaction to the absolute temperature, T. Which graph gives a straight line with a gradient equal to −E_a/R? A. k against 1/T B. ln k against T C. ln k against 1/T D.…