Syracuse University Project Advance s3

Chemistry 116: General Chemistry Syracuse University Project Advance Final Exam, Spring 2003

Name Date

The last page of this examination is a periodic table

(1) For the reaction between nitrogen(II) oxide and chlorine to produce nitrosyl chloride, 2 NO + Cl2  2 NOCl, it is found that tripling the concentration of both reactants increases the rate by a factor of 27. If only the concentration of chlorine is tripled, the rate increases by a factor of 3. The experimental rate law is:

(a) 1/2 Rate = k[NO] [Cl2] (b) 1/2 Rate = k[NO][Cl2] (c) 2 Rate = k[NO] [Cl2] (d) Rate = k[NO][Cl2] (e) Not enough information is given to answer the question.

(2) At a given temperature, a first-order reaction has a rate constant of 2.5 x 10-3 s-1. The time required for the reaction to be 25% complete is ( Hint: At is how much is there now )

(a) 120s (b) 240s (c) 440s (d) 550s (e) 640s

(3) For the reaction of the ammonium ion with nitrous acid, the net reaction is:

+ + NH4 + HNO2 ------> N2 + 2 H2O + H

The rate law for the formation of H+ is

+ (a) Rate = k[NH4 ][HNO2] + 2 + (b) Rate= k[NH4 ][HNO2] / [N2][H2O] [[H ] (c) Rate =k[H+] + (d) Rate= k[HNO2] / [H ] (e) Not enough information is provided to answer the question.

(4) Consider the oxidation of SO2(g) to form SO3(g) in the presence of NO(g):

CHE 116 1 Spring 2003 Exam Questions Eqn. 1 O2(g) + 2 NO(g) ------> 2 NO2(g) Eqn. 2 2 NO2(g) + 2 SO2(g) ------> 2 NO(g) + 2 SO3(g)

With the Net Equation:

Eqn. 3 2SO2(g) + O2(g) ------> 2 SO3(g)

Which of the following is a catalyst?

(a) O2 (b) NO (c) NO2 (d) SO2 (e) SO3

(5) Given the equilibrium system at 25°C:

+ - NH4Cl(s) <------> NH4 (aq) + Cl (aq) H = +3.5 kcal/mol

What change will shift the equilibrium to the right?

(a) decreasing the temperature to 15°C. (b) increasing the temperature to 35°C. (c) dissolving NaCl crystals in the equilibrium mixture. (d) dissolving NH4NONH3 crystals in the equilibrium mixture.

(6) For the reaction

N2(g) + 3 H2 <==> 2 NH3(g)

The equilibrium mixture of gases at 472° C was analyzed and found to contain 0.1207M H2, 0.0402M N2, and 0.0027M NH3. What is Kp at 472° C?

(a) 9.7 (b) 0.103 (c) 2.6 x 10-3 (d) 2.8 x 10-5 (e) 6.9 x 10-5

(7) For the reaction system I2(g) + Cl2(g) <======> 2 ICl(g) at equilibrium, H is –27 kJ. In order to both shift the equilibrium and increase the yield of ICl, we should

CHE 116 2 Spring 2003 Exam Questions I. increase the temperature II. decrease the temperature III. increase the pressure IV. decrease the pressure

(a) I only (b) II only (c) I and III only (d) II and III only (e) I and IV only

(8) Consider the reaction:

C(s) + 2 N2O(g) <======> CO2(g) + 2N2(g)

The equilibrium constant expression for this reaction is:

(a) [CO2][N2] / [C][N2O] 2 2 (b) [CO2][N2] / [C][N2O] 2 2 (c) [CO2][N2] / [N2O] 2 2 (d) [N2O] / [CO2][N2] 2 2 (e) [C][N2O] / [CO2][N2]

(9) Consider the reaction at equilibrium

CO(g) + 2 H2(g) <======> CH3OH(g) H = -21.7 kcal

If we decrease the temperature:

(a) the reaction shifts to the left (more reactants) (b) the reaction shifts to the right (more product) (c) the reaction is unaffected since H < 0 (d) not enough information is provided to answer the question

(10) Each of the following pairs contain one strong and one weak acid except

(a) HNO3 and H2CO3 (b) H2SO4 and H2S (c) HCl and HC2H3O2 (d) HBr and H3PO4 (e) HF and HOCl

+ -4 - (11) The concentration of H3O in a solution is 2 x 10 M. What is the OH concentration?

(a) 2 x 10-4 M (b) 1 x 10-10 M (c) 2 x 10-10 M CHE 116 3 Spring 2003 Exam Questions (d) 5 x 10-5 M (e) 5 x 10-11 M

(12) Which of the following is/are NOT a true statement?

I. An aqueous solution of BaClO4 is basic. II. An aqueous solution of KC2H3O2 (potassium acetate) is basic. III. An aqueous solution of NH4Br is acidic.

(a) I (b) II (c) III (d) I and II (e) II and III

o -5 (13) The pH of a 0.15 M aqueous solution of HoAc at 25 C is ? The Ka for HoAc is 1.8 x 10 . (a) 5.57 (b) 7.35 (c) 2.78 (d) 9.18 (e) –5.57

(14) What is the pH of a 0.00001 molar HCl solution?

(a) 1 (b) 9 (c) 5 (d) 4

(15) When 0.10 mol of solid silver nitrate is added to 1.0 L of a clear, saturated solution of -12 Ag2CrO4 (Ksp = 2.4 x 10 ), which of the following will result?

(a) The AgNO3 will settle to the bottom without dissolving. (b) The concentration of Ag+ in solution will not change. - (c) The concentration of CrO4 will increase. (d) Some AgCrO4 will precipitate. (e) None of these will happen.

(16) Which of the following is/are not a true statement?

I. For a spontaneous process, Suniv. > 0. II. For a spontaneous process at constant temperature and pressure, H – TS = 0. III. For a pure substance that is perfectly crystalline, the entropy at 0K is zero.

(a) I CHE 116 4 Spring 2003 Exam Questions (b) II (c) III (d) all are true (e) none are true

(17) For the following reaction at 25° C, H° = -45.9 kJ and S° = -98 J/K

1/2 N2(g) + 3/2 H2(g) ------> 2 NH3(g)

Calculate G° for this reaction at 25° C. From the calculated magnitude and sign, you can deduce that:

(a) The reaction proceeds spontaneously from products to reactants to produce essentially all reactatnt. (b) The reaction proceeds spontaneously from reactants to produce essentially all product. (c) The reaction produces an equilibrium mixture with significant amounts of both reactants and products. (d) cannot determine from the information provided.

(18) The heat of fusion of acetic acid is 11.5 kJ/mol. Its melting point is 16.6°C. The change in entropy for the melting of acetic acid in J/(mol K) is

(a) -11.5 (b) 11.5 (c) 15.1 (d) 39.7 (e) 694

(19) In which of the following processes will S be negative?

I. 2 H2O(g) ------> 2 H2(g) + O2(g) II. CaO(s) + CO2(g) ------> CaCO3(s) III. HgO(s) ------> Hg(l) + 1/2 O2(g)

(a) I only (b) II only (c) III only (d) I and II only (e) I and III only

(20) The value of Eo for the following reaction is 0.63 volts. What is the value of E for the reaction (in volts) when the concentration of Zn+2 is 1.0 M and the concentration of Pb+2 is 0.00020 M?

Pb+2 (aq) + Zn (s)  Zn+2 (aq) + Pb (s)

(a) 0.52 (b) 0.85 (c) 0.41 CHE 116 5 Spring 2003 Exam Questions (d) 0.74 (e) 0.63

(21) Given the following standard electrode potentials:

Reaction E°

Ce3+ <====> Ce -2.48 Pb2+ <====> Pb -0.126 Co3+ <====> Co2+ 1.84

Which one of the reactions below will not proceed spontaneously from left to right?

(a) Ce + Co3+ ------> Ce3+ + Co2+ (b) Co2+ + Ce ------> Co3+ + Ce3+ (c) Co2+ + Ce3+ ------> Co3+ + Ce (d) Pb2+ + Co3+ ------> Pb + Co2+ (e) None of the above

(22) When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?

- - - MnO4 (aq) + CN (aq) ------> MnO2(s) + CNO (aq)

(a) 13 (b) 8 (c) 10 (d) 20 (e) 11

(23) Which radioactive emanations have a charge of -1?

(a) neutrons (b) gamma rays (c) alpha particles (d) beta particles

(24) As the temperature of a sample of a radioactive element decreases, the half-life will

(a) decrease (b) increase (c) remain the same

CHE 116 6 Spring 2003 Exam Questions (25) A piece of steel pipe came out of a nuclear reactor with 1000 curies of 59Fe activity, which has a half-life of 45 days. Calculate how long it will be before the 59Fe activity falls to the level of 10 curies.

(a) 12 1/3 years (b) 6 years, 2 months (c) 299 days (d) 90 days (e) 45 days

9 12 1 (26) In the reaction 4Be + X ------> 6C + 0n , the X represents

(a) an alpha particle (b) a beta particle (c) an electron (d) a proton

(27) In which case is hydrogen present as an anion (a negative ion) called the “hydride” ion?

(a) LiAlH4 (b) B2H6 (c) NaBH4 (d) CaH2 (e) NH3

(28) Which one of the following is the weakest acid?

(a) HNO3 (b) HCl (c) HF (d) H2SO4 (e) HClO4

(29) Given the following table of thermodynamic data:

Substance S o J/mole – K C2H2 (g) 200.8 C2H4 (g) 219.4 C2H6 (g) 229.5 H2 (g) 130.58

CHE 116 7 Spring 2003 Exam Questions Determine the So ( in J/mole – K) for the reaction

C2H2 (g) + 2H2 (g)  C2H6 (g)

(a) –101.88 (b) –111.98 (c) –232.46 (d) +111.98 (e) +101.88

(30) List, in order (I) through (IV), the functional group for each of the following compounds:

H N C C C H 3 H H 3 C O C C C H 3 2 H 2 H 2 O I II

H O C C C H 3 H C C C H 3 H 2 H 2 III IV

1.) amide 2.) aldehyde 3.) alcohol 4.) carboxylic acid 5.) ester 6.) ketone 7.) ether

(a) 2, 1, 3, 7 (b) 7, 2, 3, 6 (c) 7, 1, 4, 2 (d) 5, 6, 4, 2 (e) 3, 1, 5, 2

o (31) Consider the following reaction at 25 C. C (s) + H2O (g)  CO (g) + H2 (g) Go = 91.2 kJ Ho = 131.4 kJ What is the value of S (J/K) for this reaction?

(a) –135 (b) 1.6 (c) –1.6 (d)135 (e) 223

CHE 116 8 Spring 2003 Exam Questions (32) The addition of HCl to propene yields which of the following as the major product?

(a) CH3CH2CH3 (b) CH3CH2CH2Cl (c) CH3CHClCH2Cl (d) CH3CHClCH3 (e) CH3ClCH=CH2

(33) What is the IPUAC name for the following compound?

C l C H 2 H H 3 C C C C C C H H 2 H 2 H

C H 3 C H 2

(a) 3-chloro-1,1-diethyl-2-methylhexane (b) 4-chloro-6-ethyl-5-methyloctane (c) 5-chloro-3-ethyl-4-methyloctane (d) 4-chloro-1,1-diethyl-5-methylhexane (e) none of the above

(34) Which substance is serving as the reducing agent in the following reaction?

+ -2 +2 +3 14 H + Cr2O7 + 3Ni  3Ni + 2Cr + 7H2O

(a) Ni (b) H+ -2 (c) Cr2O7 (d) H2O (e) Ni+2

(35) The monomer unit for the addition polymer Polyvinylidene chloride is vinylidene chloride (CH2=CCl2). What is the formula for the repeating unit of this polymer?

C l C C (a) H

CHE 116 9 Spring 2003 Exam Questions C l C C H 2 (b) C l

C l C l C C (c) H H

C C (d) H 2 H 2

C C (e) F 2 F 2

CHE 116 10 Spring 2003 Exam Questions