Q: Based on the graph of dye concentration versus time, what is the initial rate of the reaction if the concentration decreases from $3.40 \times 10^{-6}$ M to $2.00 \times 10^{-6}$ M in 1 minute?

$1.40 \times 10^{-6}$ mol/L\cdot min$

Question 1

In the experiment shown, blue food dye is added to water and then bleach is introduced. Over time, the color fades. Which of the following best describes what is happening to the concentration of dye as the reaction proceeds?

Accepted Answer

The concentration of dye decreases as the reaction proceeds.

Question 2

Based on the graph of dye concentration versus time, what is the initial rate of the reaction if the concentration decreases from $3.40 	imes 10^{-6}$ M to $2.00 	imes 10^{-6}$ M in 1 minute?

Accepted Answer

$1.40 	imes 10^{-6}$ mol/L\cdot min$

Question 3

Which of the following best describes the rate of a reaction as shown in a concentration vs. time graph?

Accepted Answer

The rate is the slope of the concentration vs. time graph.

Question 4

A reaction is monitored by measuring the concentration of $N_2O_5$ over time. If the concentration drops from 1.22 mol/L to 1.10 mol/L in 15 minutes, what is the average rate of reaction?

Accepted Answer

$0.0080$ mol/L\cdot min$

Question 5

Which of the following statements about reaction rates is correct?

Accepted Answer

Reaction rates are always positive and are calculated based on the change in concentration per unit time.

Question 6

If a concentration vs. time graph for a reactant shows a straight line, which order of reaction does this indicate?

Accepted Answer

Zero order

Question 7

Which integrated rate law equation corresponds to a first-order reaction?

Accepted Answer

$\ln [R]_t = -kt + \ln [R]_0$

Question 8

Which plot would give a straight line for a second-order reaction?

Accepted Answer

Plotting $\frac{1}{[R]}$ vs. time

Question 9

A reaction has a half-life of 1900 s. After two half-lives, what fraction of the original reactant remains?

Accepted Answer

$\frac{1}{4}$

Question 10

If a plot of $\ln [NO_2]$ vs. time is linear, what is the order of the reaction with respect to $NO_2$?

Accepted Answer

First order

Question 11

Which of the following is the correct integrated rate law for a zero-order reaction?

Accepted Answer

$[R]_t = -kt + [R]_0$

Question 12

Which of the following best explains why increasing the temperature increases the rate of a chemical reaction?

Accepted Answer

It increases the number of collisions and the fraction of collisions with sufficient energy to overcome the activation energy.

Question 13

In a reaction coordinate diagram, what does the peak represent?

Accepted Answer

The transition state (activated complex)

Question 14

Which equation describes the relationship between the rate constant $k$ and temperature $T$ according to the Arrhenius equation?

Accepted Answer

$k = A e^{-\frac{E_a}{RT}}$

Question 15

If a catalyst is added to a reaction, which of the following changes occur?

Accepted Answer

The activation energy decreases, but the equilibrium position does not change.

Chemical Kinetics and Equilibrium: Study Notes for General Chemistry

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