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CHM1011 - Chemistry I - S1 2025

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The reaction, A  +  2 B   →   products, was being studied.  The reagents A and B were mixed and the time interval until a certain quantity of product C accumulated was measured.  The data are

                             run #    [A]      [B]      time, secs

                               1       0.100    0.140        25

                               2       0.050    0.140        50

                               3       0.100    0.070      100

From this data one conclusion that can be made is that the reaction is
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The data below was obtained in a study on how the rate of a reaction was affected by the concentration of the reactants.

                           run #   [A]       [B]      [C]     rate, mol L-1 hr-1

                              1     0.200   0.100   0.600        5.0

                              2     0.200   0.400   0.400      80.0

                              3     0.600   0.100   0.200      15.0

                              4     0.200   0.100   0.200        5.0

                              5     0.200   0.200   0.400      20.0

From this data
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Mononitrogen monoxide reacts with bromine gas at elevated temperatures according to the equation,

2 NO(g)  +  Br2(g)   →   2 NOBr(g)

 

In a certain reaction mixture the rate of formation of NOBr(g) was found to be 4.50 x 10-4 mol L-1 s-1.  What is the rate of consumption of Br2(g), also in mol L-1 s-1?
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For the reaction, 2 XO  +  O2   →    2 XO2, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below.

run #   [XO]    [O2]      rate, mmol L-1 s-1

1        0.010    0.010           2.5

2        0.010    0.020           5.0

3        0.030    0.020         45.0

The rate law is therefore
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The reaction of substance A with substance B was carefully studied under conditions where the [B] remained essentially constant.  The graphs of [A] vs time and that of 1/[A] vs time both gave curves, but the graph of ln[A] vs time gave a straight line.
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A chemical reaction is observed to convert Molecule A into Molecule B. The accompanying graph plots the change in concentration for both molecules against the change in time. Use this graph to determine the stoichiometry of this equation, if it is written as:

A → xB

 

Image failed to load: kinetics graph
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In a first order reaction with only one reagent, the reaction was started with a concentration of reactant equal to 0.0800 molar.  After exactly two hours, the concentration had fallen to 0.0400 molar.  What is the molarity after exactly three hours?
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For the reaction:

2NO2(g) + O3(g) → N2O5(s) + O2(g)

The rate law was found to be Rate = k[NO2][O3]. Which unit below is the correct unit for the rate constant in this case?

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A reaction has the rate law, rate = k[A][B]2.  What is the order of the reaction with respect to B?
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The reaction, 2 A2X4(g)   →    2 A2X3(g)  +  X2(g), was found to be first order.  The rate law, therefore, should be
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