Skip to Main Content

Chemistry Textbook

Self-Assessments

 

Hydrogen iodide decomposes according to the following reaction:
      2HI(g) → H2(g) + I2(g).
If hydrogen gas is formed at the rate of 1.2×10-5 M/s, what is the rate of decomposition of hydrogen iodide?

Choose 1 answer



 

For the oxidation of ammonia, 4NH3+3O2⟶2N2+6H2O,
the rate of disappearance of NH3 at a certain instant was found to be 0.35 mol L‑1 s‑1. What is the rate of disappearance of O2 in the same instant?

Choose 1 answer



 

For the oxidation of ammonia, 4NH3+3O2⟶2N2+6H2O,
the rate of disappearance of NH3at a certain instant in time was found to be 0.55 mol L‑1 s‑1. What is the rate of the reaction in the same instant?

Choose 1 answer



 

Consider the reaction for ammonia synthesis: N2(g) + 3H2(g) ⟶ 2NH3(g). If the rate of the reaction at a certain instant is 1.2 × 10-3 M/s, what is the rate of disappearance of hydrogen (H2)?

Choose 1 answer



 

Consider the concentration data for decomposition of H2O2 in the presence of a catalyst according to the reaction,
2H2O2(g) ⟶ 2H2O(g) + O2(g).

 t (sec)

 [H2O2]

 100

 1.0 M

 200

 0.080 M

 300

 0.0064 M

What is the average rate of the reaction between 200 and 300 seconds?

Choose 1 answer



 

An experiment shows that the reaction,
2N2O5⟶2NO2+O2,
is a first order reaction. What is the rate law of the reaction?

Choose 1 answer



 

Nitric oxide, released by supersonic aircrafts flown in the stratosphere, reacts with ozone and can contribute to depletion of the ozone layer. 

The reaction NO+O3⟶NO2+O2is first order with respect to both NO and O3.
When [NO] = 3.3 × 10−6 M and [O3] = 5.9 × 10−7 M, the rate of the reaction was found to be 4.3 × 10-5 mol/L/s. What is the rate constant of the reaction?

Choose 1 answer



 

The rate law for the reaction, H2(g)+2NO(g)⟶N2O(g)+H2O(g),
has been experimentally determined to be
rate = k[NO]2[H2]. 

How is the rate of the reaction affected when the concentration of NO is tripled and concentration of H2 is halved?

Choose 1 answer



 

Determine the rate law of the reaction, A + 2B ⟶ C, using the initial rate data provided below:

[A] (M)

[B] (M)

Initial Rate (M/s)

0.015

0.010

3.4×10-5

0.030

0.030

4.1×10-4

0.015

0.020

6.8×10-5

0.14

0.010

2.9×10-3



Choose 1 answer



 

The reaction of nitrogen dioxide with carbon monoxide is
2NO2(g) + CO(g) →NO(g)+CO2(g)
The kinetics of this reaction have been studied in the laboratory, and some initial rate data below 400 K is listed in the following table:

Experiment

[NO2]  (M)

[CO]  (M)

Initial Rate   (M/s)

1

3.4 × 10−8

3.5 × 10−7

1.6 × 10−6

2

1.1 × 10−8

1.5 × 10−7

1.7 × 10−7

3

1.1 × 10−8

2.5 × 10−7

1.7 × 10−7

4

5.5 × 10−8

1.5 × 10−7

4.3 × 10−6

What is the rate law of the reaction?

Choose 1 answer



 

The decomposition of Sulfuryl chloride (SO2Cl2) to SO2and Cl2 according to the following reaction was determined to follow first order kinetics:
         SO2Cl2(g) → SO2(g) + Cl2(g).
The rate constant of the reaction was determined to be 2.2 × 10-5 s-1. If the reaction started with 0.030 M SO2Cl2, what is the concentration of SO2Cl2 after 5 hours?

Choose 1 answer



 

The decomposition of Sulfuryl chloride (SO2Cl2) to SO2and Cl2 according to the following reaction was determined to follow first order kinetics:
         SO2Cl2(g) → SO2(g) + Cl2(g).
The rate constant of the reaction was determined to be 2.2 × 10-5 s-1. If the reaction started with 0.030 M SO2Cl2, how much time does it take for the concentration to decrease to 0.028 M?

Choose 1 answer



 

The reaction of t-butyl chloride with water is first ordered with respect to t-butyl chloride. The rate constant of the reaction was determined to be 15 × 10−4s−1 at 25°C. How much time does it take for 15% of SO2Cl2 to decompose?

Choose 1 answer



 

The decomposition of nitrous oxide (N2O) over hot platinum surface is a zero-order reaction:
2N2O(g) → 2N2(g) + O2(g).
The rate constant of the reaction is 1.2 × 10-3 M/s at 565 o How much time does it take for the reactant concentration to decrease from 0.100 M to 0.072 M?

Choose 1 answer



 

The rate law for the reaction, 2NOBr(g) → 2NO(g) + Br2(g) is rate = k[NOBr]2.
The rate constant of the reaction is 0.51 M-1 s-1 at a certain temperature. If the initial concentration of the reactant is 0.300 M, what is the concentration after 120 s?

Choose 1 answer



 

The second order reaction, A → products, yields a linear plot when ______ is plotted on the X-axis and ____ is plotted on the Y-axis.

Choose 1 answer



 

For the reaction 2A → B, the following plot was obtained. What is the rate law of the reaction?

 

Choose 1 answer



 

How is the rate constant determined from the linear plot yield by the zero-order reaction, A → Products?

Choose 1 answer



 

Determine the rate constant from the following plot yielded for the first order reaction, X → Y

 

Choose 1 answer



 

What is the rate constant of the zero-order reaction, A → B, that yielded the following data?

[A]

0.10 M

0.08 M

0.06 M

0.04 M

0.02 M

time

10 s

20 s

30 s

40 s

50 s

Hint: A plot is not needed to answer this question.

Choose 1 answer



 

In a first order reaction, if the concentration of the reactant dropped from 650 mM to 230 mM in 25 seconds, what is the half-life of the reaction?

Choose 1 answer



 

Radioactive decay follows first order kinetics.
Since plants stop absorbing carbon-14 when begin to decay, the amount of carbon-14 left behind is used to reveal the age of the tree. The half-life of carbon-14 isotope is 5730 years. If 65% of carbon-14 is still left in an ancient piece of wood, how long ago was the tree dead?

Choose 1 answer



 

Holmium-166 isotope is a short-lived medical isotope that was developed in the recent years for diagnosis and treatment of liver tumors.
The half-life of Holmium-99 is 26.8 hours. What fraction of the isotope will be left after 42 hours?

Choose 1 answer



 

In a first order reaction, X → Y, it takes 50 min for concentration of X to decrease to half of its initial concentration. If the initial concentration of X is 0.70 M, how much time does it take for its concentration to decrease to 4.38 × 10-2 M?

Choose 1 answer



 

Consider the second order reaction, 2 HI(g) → I2(g) + H2(g).
At a certain temperature, the half-life of the reaction was found to be 15 sec when the initial concentration of HI is 0.5 M. What is the rate constant of the reaction at the same temperature?

Choose 1 answer