Calculate a rate or a concentration from the rate equation and the rate constant, and work out the units of k for zero, first, second and third order reactions from the overall order, noting that k depends only on temperature.
Tę umiejętność sprawdza 13 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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…
Calculate the rate constant using the data from experiment 1 and include its units in your answer.
Calculate the rate constant, k, for this reaction at this temperature, including its units, using one row of the table.
Which statement about the rate constant, k, of an elementary reaction is correct? A. k increases when the temperature is raised, whether the reaction is exothermic or endothermic. B. k decreases when the temperature is raised for exothermic reactions. C. k…
A reaction has the rate equation below. What are the units of the rate constant k? rate = k[A]2[B][C]0 A. s−1 B. mol−1 dm3 s−1 C. mol−2 dm6 s−1 D.…
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…
The student then followed the reaction with a spectrophotometer, which records the light absorbed by the mixture and so gives the concentration of the dye throughout the reaction. The graph shows [D+] against time for experiment 3. (i) Use the graph to…
Nitrogen dioxide, NO2, is one of the brown pollutant gases in photochemical smog. It can react with carbon monoxide, which is also present in polluted air. NO2(g) + CO(g) → NO(g) + CO2(g) (i) Suggest how the rate of this reaction could be…
The temperature of a reaction mixture is raised and the rate constant, k, increases. Which statement best explains why? A. The activation energy of the reaction decreases B. The reaction becomes more exothermic C. More particles are present in the same…
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.
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, Ea B. Rate constant, k C. Standard enthalpy change of the reaction, ΔH⊖ D. Order of…
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
The reaction between nitrogen dioxide and carbon monoxide was studied at 600 K. NO2(g) + CO(g) → NO(g) + CO2(g) The following experimental data were obtained. (i) Deduce the order of reaction with respect to nitrogen dioxide. (ii) Deduce the rate…
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