CAS CH 596 | Course Paper

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The following questions refer to the hypothetical reaction A + B –> products. The

kinetics data given can be analyzed to answer the questions.

What form will the pseudo-rate law have?

A)Rate = k'[A]x

B)Rate = k'[B]y

C)Rate = k'[A]x[B]y

D)Rate = kk'[A]x

E)Rate = kk'[B]y

The oxidation of Cr3+ to CrO4

2- can be accomplished using Ce4+ in a buffered solution.

The following data were obtained:

Determine the order in the rate law of the species Cr3+.

A)1

B)2

C)3

D)-1

E)-2

Consider the following information about the diprotic acid, ascorbic acid. (H2As for

short, molar mass 176.1)

H2As HAs–+ H+pKa= 4.10 (Ka= 7.9×10-5)

HAs– As2-+ H+pKa= 11.79 (Ka= 1.6×10-12)

The titration curve for disodium ascorbate, Na2As, with standard HCl is shown below:

What is the pH at point III?

A) 4.10

B) 7.95

C) 11.79

D) 12.39

E) none of these

What is the pH for a buffer that consists of 0.45 M CH3COOH and 0.35 M

CH3COONa? Kaof CH3COOH = 1.8 x 10-5

Initial rate data have been determined at a certain temperature for the gaseous reaction

What is the value of the rate constant?

The reduction potential to the metal of Ba2+is -1.57 V. Given that the cell potential for

the reaction 3 Ba(s) + 2 La3+(aq) –> 3 Ba2+(aq) + 2 La(s) is 0.52 V, the reduction

potential for La3+(aq) is:

A) (0.52 – (3 x -1.57)) / 2

B) (0.52) – (-1.57)

C) (+1.57) + (0.52)

D) 0.52 – (+1.57)

E) (-1.57) – (0.52)

Which of the following is the strongest base? (Kbfor NH3is 1.8×10-5, Ka2for H2SO4is

1.2×10-2, Ka3for H3PO4is 4.8×10-13)

NH3, HSO4

–, PO4

3-, or NO3

–

Which of the following metals (M) is mostly likely to form an oxide of the formula

MO3?

A) Sc

B) Ti

C) Cr

D) V

E) Mn

When ignited, solid ammonium dichromate decomposes in a fiery display. This is the

reaction for a “volcano” demonstration. The decomposition produces nitrogen gas,

water vapor, and chromium(III) oxide. The temperature is constant at 25°C

Determine S° reaction (in kJ/mol K).

A) 0.2777

B) 0.8612

C) 0.7475

D) 0.6338

E) 0.1590

The oxidation of Cr3+ to CrO4

2- can be accomplished using Ce4+ in a buffered solution.

The following data were obtained:

Determine the order in the rate law of the species Ce4+.

A)1

B)2

C)3

D)-1

E)-2

Select the answer that best describes an aqueous solution made from each of the

following substances:

solid aluminum chloride (AlCl3)

A) acidic

B) basic

C) neutral

D) cannot tell

E) none of these (A-D)

The following question refers to a galvanic cell that utilizes the following reaction

(unbalanced):

(AuCl4)–(aq) + Cu(s) –> Au(s) + Cl–(aq) + Cu2+(aq)

Given the following information, determine the standard cell potential:

A) 1.1590 V

B) 1.8370 V

C) 3.8160 V

D) 0.8200 V

E) 4.1550 V

An unknown molecule is found to consist of 24.2% carbon by mass, 4.0% hydrogen by

mass and the remaining mass is due to chlorine. What is the molecular formula of the

molecule given that the molar mass is found to be approximately 150?

A)CH2Cl

B)C2H4Cl2

C)CH2Cl4

D)C3H6Cl3

E)C6H10Cl2

The dimerization of NO2has a rate constant at 25OC of 2.45 x 10-2L/mol min. What will

be the concentration of NO2after 120. seconds, given a starting concentration of NO2of

11.5 mol/L?

A)0.331 mol/L

B)0.608 mol/L

C)7.36 mol/L

D)10.95 mol/L

E)12.1 mol/L

Consider the reaction between ethane (C2H6) and oxygen gas (O2) to produce carbon

dioxide and water, as shown. What volume of carbon dioxide will be produced at STP

from the reaction of 4.00 L of ethane with 7.00 L of oxygen?

A)2.00 L CO2

B)3.00 L CO2

C)4.00 L CO2

D)6.00 L CO2

E)8.00 L CO2

If you could increase the concentration of Zn2+, which of the following is true about the

cell potential?

A) It would increase.

B) It would decrease.

C) It would remain constant.

D) Cannot be determined.

E) None of these (A-D).

Which of the following oxides will give the most basic solution when dissolved in

water?

A) SO2

B) CO2

C) K2O

D) P4O10

E) BeO

How many possible values are there for the quantity €c/d€?

A)1

B)2

C)3

D)4

E)infinite

The questions below refer to the following system:

When cobalt(II) chloride is added to pure water, the Co2+ions hydrate. The hydrated

form then reacts with the Cl–ions to set up the equilibrium shown here.

Which statement below describes the change that the system will undergo if

hydrochloric acid is added?

A) It should become more blue.

B) It should become more pink.

C) The equilibrium will shift to the right.

D) The equilibrium will shift to the left.

E) Two of these.