Q: 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?

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

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

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