How fast? The rate of chemical change

What is the effect of decreasing temperature on this Maxwell-Boltzmann energy distribution curve? A. The curve maximum is higher and to the left of A. B. The curve maximum is lower and to the right of A. C. The curve maximum is higher and to the right of A. D.…

Which of these changes will increase the time taken for this reaction to go to completion? $\ce{Zn(s) + H2SO4(aq) -> ZnSO4(aq) + H2(g)}$ A. Increase the temperature B. Increase the concentration of $\ce{H2SO4}$ C. Use powdered zinc instead of zinc granules D.…

What does the pre-exponential (Arrhenius) factor, A, represent in the Arrhenius equation $k = Ae^{-E_a/RT}$? A. The fraction of collisions with the correct orientation and sufficient frequency B. The activation energy of the reaction C. The overall rate…

The student's results are shown below. Each time was measured to ± 0.1 s. Concentration of $\ce{Na2S2O3}$ / $\mathrm{mol\,dm^{-3}}$ Time, trial 1 / s Time, trial 2 / s Time, trial 3 / s Time, trial 4 / s Time, trial 5 / s Average time / s 0.2000 ± 0.08 % 17.2…

The average times were plotted against concentration. Draw a curve of best fit through the points on the graph.

A second student repeated the experiment with the same five solutions and the same apparatus and obtained the following times. Concentration of $\ce{Na2S2O3}$ / $\mathrm{mol\,dm^{-3}}$ Reaction time / s (± 0.1 s) 0.2000 ± 0.08 % 20.1 0.1000 ± 0.2 % 37.5 0.0500…

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

The sealed vessel was left for the reaction to proceed. Suggest two properties of the system, other than its colour, that could be measured to follow the progress of the reaction over time, and predict how each would change as the forward reaction proceeds.

Determine, using a suitable construction drawn on the graph, the initial rate at which $\ce{CO2(g)}$ is released, in $\mathrm{g\,s^{-1}}$, in the reaction with 1.20 $\mathrm{mol\,dm^{-3}}$ $\ce{HNO3(aq)}$.

In moist air carbonyl dibromide is slowly hydrolyzed: $\ce{Br2CO(g) + H2O(g) -> CO2(g) + 2HBr(g)}$ (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…