Question 1

Which of the following is the correct rate law for the reaction $N_2(g) + 3Cl_2(g) \rightarrow 2NCl_3(g)$, given the initial rate data in the table?

Accepted Answer

$	ext{rate} = k[N_2][Cl_2]^3$

Question 2

A kinetics experiment uses 0.500 M $N_2$ and 0.500 M $Cl_2$. What is the initial rate of $NCl_3$ formation if the rate law is $	ext{rate} = k[N_2][Cl_2]^3$ and $k = 0.0400 	ext{ min}^{-1}$?

Accepted Answer

$0.0250 	ext{ M/min}$

Question 3

If the initial rate of $NCl_3$ formation is $0.0250 	ext{ M/min}$, what is the initial rate at which $Cl_2$ is consumed?

Accepted Answer

$0.0750 	ext{ M/min}$

Question 4

In a lab, you react two different zinc samples with acid—zinc granules and zinc shot. Which combination would have the greatest reaction rate?

Accepted Answer

1.0 g zinc shot with excess 0.50 M HCl

Question 5

A kinetics experiment uses 17.0 mL of $7.50 	imes 10^{-4}$ M $CV$ solution and 3.00 mL of $0.30$ M $NaOH$ solution. Calculate the initial $OH^-$ concentration when these solutions are mixed.

Accepted Answer

$5.29 	imes 10^{-2}$ M

Question 6

Which of the following is the correct formula for calculating pH from $[H^+]$?

Accepted Answer

$	ext{pH} = -\log [H^+]$

Question 7

A student measures the absorbance of a $FeSCN^{2+}$ solution and gets $A = 0.500$. Using the calibration curve $A = 5.21 	imes [FeSCN^{2+}] + 0.043$, what is the concentration of $FeSCN^{2+}$?

Accepted Answer

$8.76 	imes 10^{-2}$ M$

Question 8

A weak acid solution has an initial pH of 3.17. What is the $K_a$ of this acid?

Accepted Answer

$6.8 	imes 10^{-6}$

Question 9

A $0.250$ M solution of a weak base is $1.24\%$ dissociated. What is the pH of this solution?

Accepted Answer

12.52

Question 10

Calculate the $K_b$ of a $0.250$ M weak base that is $1.24\%$ dissociated.

Accepted Answer

$3.0 	imes 10^{-5}$

Question 11

A $0.585$ g sample of toilet cleaner is titrated with $0.1327$ M $NaOH$. The active ingredient is $HCl$. If $16.34$ mL of $NaOH$ is required, how many moles of $HCl$ are in the sample?

Accepted Answer

$2.17 	imes 10^{-2}$ mol

Question 12

Calculate the percent by mass of $HCl$ in the toilet cleaner sample. (Molar mass of $HCl$ is $36.46$ g/mol)

Accepted Answer

4.27\%

Question 13

A solution of $Cu(NO_3)_2$ is placed in $16.0$ mL of $0.0152$ M $KIO_3$. The solution is heated until saturated, then cooled. The equilibrium concentration of $Cu^{2+}$ is $1.7 	imes 10^{-4}$ M. What is the $K_{sp}$ of $Cu(IO_3)_2$?

Accepted Answer

$5.3 	imes 10^{-9}$

Question 14

If the previous experiment is repeated with $Cu(NO_3)_2$ in $16.0$ mL of $0.050$ M $KIO_3$, how will the results change?

Accepted Answer

$[Cu^{2+}]$ will be smaller and $K_{sp}$ will remain the same

Question 15

The $K_{sp}$ of $Cu(IO_3)_2$ is $5.3 	imes 10^{-9}$. Calculate the mass of solid $Cu(IO_3)_2$ that can dissolve in $16.0$ mL of distilled water.

Accepted Answer

$6.6 	imes 10^{-6}$ g

Question 16

Which of the following is the safest practice when working with chemicals and glassware in a chemistry lab?

Accepted Answer

On your feet if you are wearing closed-toe shoes.

Question 17

A student prepares a standard solution by mixing $10.0$ mL of $0.0100$ M $FeSCN^{2+}$ and $10.0$ mL of $0.0200$ M $SCN^-$. What is the $FeSCN^{2+}$ concentration at equilibrium?

Accepted Answer

$5.21 	imes 10^{-3}$ M

Question 18

Which of the following best describes the order of reaction if doubling $[OH^-]$ doubles the rate, but doubling $[CV^+]$ does not affect the rate?

Accepted Answer

First order in $OH^-$, zero order in $CV^+$

General Chemistry Exam Study Guide: Kinetics, Equilibrium, Acid-Base, and Laboratory Calculations

Study Guide - Practice Questions

Study Guide - Flashcards