PRACTICE TEST 2 221

PRACTICE TEST 2Time: 60 minutes

Note: Unless otherwise stated, for all statements involving chemical equations and/or solutions, assume that the system isin pure water.

Part A

Directions: Each of the following sets of lettered choices refers to the numbered formulas or statements immediatelybelow it. For each numbered item, choose the one lettered choice that fits it best. Then fill in the corresponding oval onthe answer sheet. Each choice in a set may be used once, more than once, or not at all.

aue$rans l-a(A) Sublimation(B) Deposition(C) Vaporization(D) Condensation(E) Melting

TemperatureFigure 1

l. PhaseA*PhaseB

2. Phase C * Phase A

3. PhaseA+PhaseC

4. Phase B + Phase C

(.)L

o!Ar

222

PRACTICEOuestions 5-8

(A) R-COOH(B) R-CHO

iB i13:;1,5. Can be neutralized with a base

6. Could be named 2-pentanone

7. Amide functional group

8. Aldehyde functional group

Ouestions 9-11

(A) 6.02 x 1023 molecules(B) 1 1.2 liters(C) 58.5 grams/mole(D) 2.0 moles(E) 5 atoms

9. 88 grams of COlg) at STP

10. 1 molecule of CHa

11. 32 grams of SO2 gas at STP

auesgalsl2=l5(A) Alkali metal(B) Alkaline earth metal(C) Transition metal(D) Halogen(E) Noble gas

12. Reacts most vigorously with water

13. Is chemically inert

14. Has the highest first ionization energy in its period

15. Forms ions with a2+ charge

PART IV / FOUR FUII-IENGTH PRACTICE TESTS

TEST-ContinuedOuestions 16-18

(A) Blue(B) Red(C) Pink/purple(D) Colorless(E) Orange

Phenolphthalein in base

Litmus in acid

Phenolphthalein in acid

16.

n.

18.

Ouestions 19-22

(A)(B)(c)(D)(E)

19. Ptotr=Pr+P2+P3+.

20. P1V1 = P2V2

21. PV=nRT

PV P,V,naLL. T, T2

Ouestions 23-25

(A)(B)(c)(D)(E)

23. Has a charge of 2+

24. Has the lowest mass

25. Has the greatest mass

Boyle's LawCharles'LawIdeal Gas EquationCombined Gas LawDalton's Law of PartialPressures

orHe

0^l_L

Ylofl

ttH

PRACTICE TEST 2

PRACTICE TBST- C ontinuedPLEASE GO TO THE SPECIAL SECTION AT THE LOWER LEFT-HAND CORNER OF YOURANSWER SHEET LABELED "CHEMISTRY'' AND ANSWER QUESTIONS 101_115ACCORDING TO THE FOLLOWING DIRECTIONS.

223

Part B

Directions: Each question below consists of two statements. For each question, deter111ine whether statement I in the lef6most column is true or false and whether statement II in the rightmost column is ffue or false. Fill in the corresponding Tor F ovals on the answer sheet provided. Fill in the oval labeled "CE' only if statement II correctly explains statement I.

SAMPLE:

EX 1. The nucleus of an atom has a BECAUSE the only positive particlespositive charge

SAMPLE ANSWER

found in the atom's nucleus areprotons.

I II CE"

EX1 (D@ (DO (D

I101. The double and single bonds in benzene

are subject to resonance

102. The element with an electronconfiguration of [He]2sr has a largeratomic radius than fluorine

103. 1m NaCl(aq) will have a higher boilingpoint than that of lm CaCl2@q)

104. Neutrons and protons are classified asnucleons

105. HCI is considered to be an acid

106. Powdered zinc reacts faster with acidthan a larger piece of zinc

107. NH3 can best be collected by waterdisplacement

IIbenzene has delocalized pi electrons that stabilizeits structure.

the element with an electron configuration of[He]2sl has a greater nuclear charge than fluorine.

I mole of NaCl yields 3 moles of ions in solution.

neutrons and protons are both located in the princi-pal energy levels of the atom.

HCI is a proton acceptor.

powdered zinc has a greater surface area.

NH3 is a polar substance.

BECAUSE

BECAUSE

BECAUSE

BECAUSE

BECAUSE

BECAUSE

BECAUSE

224

108. At 1 atm, Pure water can boil at atemperature less than 273 K

109. An exothermic reaction has a negativevalue for AH

110. As pressure on a gas increases, thevolume of the gas decreases

I 11. The addition of Hz to ethene will form anunsaturated compound called ethane

II2. AgCl is insoluble in water

113. AS will be Positive in value as

vaporization occurs

ll4. Pure water has a PH of 7

I I5. CH3CH2-OH and CH1-O-CH3are isomers

PART IV / FOUR FUIL-IENGTH PRACTICE TESTS

PRACTICE TEST- C ontinuedBECAUSE water boils when the vapor pressure of the water is

equal to the atmospheric pressure.

BECAUSE in an exothermic reaction the products have lesspotential energy than the reactants.

BECAUSE pressure and volume have a direct relationship'

BECAUSE ethane has as many hydrogen atoms bonded to thecarbon atoms as Possible.

BECAUSE all chlorides are soluble in water except for thoseof silver, mercury, and lead.

BECAUSE

BECAUSE

BECAUSE

vaporization increases the order of the moleculesentering the gas phase.

the number of Hr* ions is equal to the numberOHr- ions.

CH3CH2-OH and CH:-O-CH3 have the samemolecular formula but different structures.

PRACTICE TEST 2 225

PRACTICE TEST- Continuedpart C

Directions: Each of the multiple-choice questions or incomplete sentences below is followed by five answers or com-pletions. Select the one answer that is best in each case and then fill in the corresponding ouul on the answer sheetprovided.

29.26. One mole of each of the following substances is dis-solved in 1.0 kg of water. Which solution will have thelowest freezing point?(A) NaCrH3O2(B) NaCl(C) Mgclu(D) CH3OH(E) C6H1206

Which of these equations is/are properly balanced?I. Cl2 + 2NaBr * Br2 + 2NaClII. 2Na + 02 - NazOIII. 2K +2H2O + Hz * 2KOH

(A) I only(B) II only(C) III only(D) I and III only(E) I, II, andIII

Propane and oxygen react according to the equation:C:H'(g) + 5O2(g) * 3COz(B) + 4HrO(g). How manygrams of water can be produced from the completecombustion of 2.0 moles of CjHs(g)?(A) 144.0(B) 82.0(c) 8.0(D) 44.8(E) 22.4

A compound was analyzed and found to be composedof l5Vo carbon and25Vo hydrogen. What is the empir-ical formula of this compound?(A) CrH4(B) crl(c) cH3(D) CH,(E) CH

Which compound below has a bent molecular geome-try?(A) HrSO4(B) CH4(c) co,(D) HrS(E) CzHr.

Of the equipment listed below, which one wouldrequire you to read a meniscus?(A) 100 mL beaker(B) 500 mL flask(C) Watch glass(D) 50 mL buret(E) Trough

Given the following reaction at equilibrium: Fe3*(aq)+ SCN-(aq) -* FeSCN2t(aq). Which of these wouldshift the equilibrium to the left?(A) Adding FeCl, to the reacrion(B) Adding NH4SCN ro the reaction(C) Increasing the pressure on the reaction(D) Adding a caralysr(E) Adding FeSCN2-(aq) to rhe reaction

30.21,

31.

28.

Jl-

226

33. Which letter in the boxes below has a value of 7?

PART IV / FOUR FUI-L-LENGTH PRACTICE TESTS

PRACTICE TEST- C ontinue d

39

40.

41.

i4.

35

36.

31

(A) A(B) B(C) C(D) D(E) E

Each of the elements below is placed in water. Whichone will react violently with the water?

(A) Na(ts) Fe(C) Cu(D) Au(E) Ne

Which unit is paired incorrectly?(A) Ton and pressure(B) Mass and grams(C) Heat energy and kiloPascals1D1 Volume and rnilliliter(E) Temperature and Kelvin

Which amount of Pb(NO:)u, when added to enoughwater to make I liter of solution, will produce a solu-tion with a molarity of 1.0 Ml(A) 144 grams(B) 331grams(C) 317 grams(D) 0.003 moles(E) 0.5 moles

Enough AgCl(s) is dissolved in water at 298 K to pro-duce a saturated solution. The concentratiot.r of Agr*ions is found to be 1.3 x 1 0-5 M. The K,o value for AgClwill be

(A) 2.6 x 10-10

(B) 1.3 x 10-ro(C) 1.3 x 10r(D) 1.8 x l0-5(E) 1.8 x 10-10

38. Which statement below is inconsistent with the con-cept of isotopes?(A) Each element is composed of atoms.(B) All atoms of an element are identical.(C) The atoms of different elements have different

chemical and physical properties.(D) The combining of elements leads to the forma-

tion ol compounds.(E) In a compound, the kinds and numbers of atoms

are constant.

Which sample below has its atoms aranged in a reg-ular, geometric pattern?(A) NaCrH:Oz(s)(B) HrO(l)(C) Ar(e)(D) NaCl(aq)(E) CH*(e)

Of the statements below. which holds true for the ele-ments found in Na2HPOa'?

(A) The total molar mass is 7l gramslmole.(B) The percent by mass ofoxygen is 457o.(C) The percent by mass of sodium is 167o.(D) The percent by mass of phosphorus is 44Vo.(E) The percent by mass of hydrogen is 137o.

Carbon and oxygen react to form carbon dioxideaccording to the reaction: C(s) + Or(g) - CO2(g). Hotrmuch carbon dioxide can be fbrmed from the reactionof 35 grams of carbon rvith 64 grams of oxygen gas?

(A) 36 grams(B) 64 grams(C) 28 grams(D) 132 grams(E) 88 grams

lsotopeNumber of

ProtonsNumber ofNeutrons

Number ofElectrons

MassNumber

AtornicNumber

r60 A

r]C B E

23Na C

10B D

PRACTICE TEST- C ontinued42. What is the correct mass-action expression for the 46.

reaction 2NO(g) + Cb(g) -- 2NOCl(gX

INO][Cl,](Ai tNoclr

(B) INOCI]INO][Cl,]

,t\ [NO],[Clr](\''' NoclT-

(D) [NoclF[NoF[ct,] 47 -

PRACTICE TEST 2

Which of the following processes will decrease therate of a chemical reaction?I. Using highly concentrated reactantsII. Decreasing the temperature by 25 KIII. Stining the reactants

(A) I only(B) II only(C) I and III only(D) II and III only(E) I, II, and III

Of the substances below, which is best able to conductelectricity?(A) KBr(l)(B) NaCzH:Oz(s)(C) C6H1206(aq)(D) CH3OH(aq)(E) NaCl(s)

A voltaic cell is set up and a chemical reaction pro-ceeds spontaneously. Which of the following will notoccur in this reaction?(A) The electrons will migrate through the wire.(B) The cations in the sait bridge will migrate to the

anode half cell.The cathode will gain mass.The anode will lose mass.Reduction will occur at the cathode.

227

What is the value for AH for the reaction: D + A +B*F?(A+B-Q AH=-390kJ)(D+l2B-E AH=-280kJ)(F +%B-C+E LH=-275kcat)

(A) -165 kJ(B) +385 kJ(c) -39s kJ(D) -945 kJ(E) +400 kJ

The oxidation state of the elements in the choicesbelow will be 1- except for(A) F in HF(B) Cl in NaCl(C) O inH2C)2(D) F in NaF(E) H in Na2HPOa

Which substance is not correctly paired with the typeof bonding found between the atoms of that sub-stance?

(A) CHa-covalent bonds(B) CaO-ionic bonds(C) Fe-metallic bonds(D) H3ot--coordinate covalent bonds(E) Cl2-polar covalent bonds

Which electron conflguration shows that of an excitedatom?(A) 1s22s22p63s1(B) ls22s22p63s23p63dl(C) ls22s22pt(D) ls22s22p63s23pa4sz(E) Is22s22p63sz3pz

Given the chemical reaction 3Hz(g) + N2(g) *-2NH3(g) + energy, the forward reaction can best bedescribed as a(n)I. Synthesis reactionII. Phase equilibriumIII. Exothermicreaction

(A) II only(B) I and II only(C) I and III only(D) II and III only(E) I, II, and III

(E)

43.

48.

44 49.

45. 50.

(c)(D)(E)

228

51.

PART IV / FOUR FULL-IENGTH PRACTICE TESTS

PRACTICE TEST- C ontinue d56. Which of the following best describes the orbital over-

lap in a molecule ofWhich of the following is not true regarding conju-gates and conjugate Pairs?(A) HF and Fr- are conjugate Pairs.(B) NaCzH:O2 and CzH:Ozl- are conjugate pairs.(C) CO32_ is the conjugate base of HCOrr-.(D) NH41. is the conjugate acid of NH3.(E) A conjugate pair will differ by an Hl* ion.

What is the ratio of the rate of effusion of hydrogengas to that of helium gas?

(A) t.4r(B) 2"00(c) 4.00(D) 0.s0(E) r.00

Which substance below will exhibit hydrogen bond-ing between the molecules of the substance?

(A) CH4(ts) HBr(c) HC1(D) HrO(E) I{,

Given the reaction: Nr(g) +3H2@) ** 2NH:( g) + 22kcal, what is the value for AH for the reverse reactionwhen 6 moles of NHr ?r€ colSullled to produce nitro-gen gas and hydrogen gas?

(A) +22 kcal(B) +66 kcal(C) -22kcal(D) -66 kcal(E) +33 kcal

A titration is set up so that 40.0 mL of 1.0 MNaOH are

titrated with 2.0 M HCl.If the initial reading of themeniscus of the acid' s burette is 3. I 5 mL what will thefinal burette reading be?

(A) 20.00 mL(B) 40.00 mL(C) 43.15 mL(D) 23.15 mL(E) 13.15 mL

I,II.III.

52.

H-C:C-H?llHHFigure 2

StoSstopsp2 to sp2

(A) I only(B) II only(C) I and III only(D) II and III only(E) I, II, andiII

What will be the new freezing point of the water in asolution of 1 m NaCl(aq)?(A) -1.86'C(B) -0.52"C(c) -3.12'C(D) 1.86"C(E) 3.12'C

Which metal will not generate hydrogen gas whenplaced in HCl(aq)?(A) Au(B) Me(C) Ca(D) Sr(E) Zn

Which substance is the best oxidizing agent?

(A) Fe(B) 02(C) Na(D) Li(E) F2

Which substance is not correctly paired with the bond-ing found between the molecules of that substance.)

(A) NHr-hydrogenbonding(B) Fz-Van der Waals (dispersion) forces(C) HC1-dipoles(D) CHa-dipoles(E) NaCl(aq)--molecule-ion attraction

51.53.

5854,

59.

55.

60.

PRACTICE TEST 2 229

PRACTICE TEST- Continued67.6t. Which solution is not expected to conduct electricity?

(A) NaCl(aq)(B) C6H1106(aq)(C) KBr(aq)(D) HCrH3Odaq)(E) NaoH(aq)

Which of the following statements about solubility iscorrect?(A) Gases decrease in solubility with an increase in

temperature.(B) NaCl is insoluble in water.(C) PbI, is soluble in water.(D) All nitrates are insoluble in water.(E) Solubility depends solely upon the amounr of

solvent used.

In 6.20 hours, a 50.0-gram sample of rr2Ag decays to12.5 grams. What is the half-life of 1r2Ag?

(A) 1.60 hours(B) 3.10 hours(C) 6.20 hours(D) 12.4 hours(E) 18.6 hours

The modern periodic table is based upon(A) atomic mass of the elements(B) number of neutrons in the nucleus(C) number of isotopes of an element(D) oxidation states(E) number of protons in the nucleus

The prefix centi- means(A) one thousand(B) one thousandth(C) one hundred(D) one hundredth(E) one millionth

What is the pH of a 0.1 M acid solution where the acidhasaKuof 1x 10r?(A) 3(B) s(c) 6(D) 4(E) I

Which of the following would you not do in a labora-tory setting?I. Pour acids and bases over a sinkII. Wear gogglesIIL Heat a stoppered test tube

(A) I only(B) II only(C) III only(D) I and III only(E) I, II, and III

Which of the following statements is not true regard-ing the kinetic molecular theory?(A) The volume that gas molecules occupy is negli-

gible compared to the volume within which thegas is contained.

(B) There are no forces present between gas mole-cules.

(C) Collisions between gas molecules are perfectlyelastic.

(D) Gas molecules travel in a continuous, randommotion.

(E) The average kinetic energy of gas molecules isinversely proportional to temperature.

How many times more basic is a solution with a pH of10 than a solution with a pH of 8?(A) A pH of l0 is two times as basic.(B) A pH of 8 is two times as basic.(C) A pH of 10 is 2,000 times as basic.(D) A pH of 8 is 20 times as basic.(E) A pH of 10 is i00 times as basic.

Which of the following reactions is not labeled cor-rectly?(A) Fe + Cr3* - Fe3* + Cr (redox reaction)(B) KBr + H2O * HBr + KOH (hydrolysis)(C) CH4 +2O2+ CO2+2HrO (combustion)(D) CH4 + Cl2 + CH3CI + HCI (addition)(E) CO2 + H2O - HzCO: (synthesis)

62.

68.

63.

69.64.

65.

66.

70.

STOPIF YOU FINISH BEFORE TIME IS CALLED, GO BACK AND CHECK YOUR WORK

ANSWERS'!1. E!2. B!3. A!4. C!5. A!6. C!7. E!8. B!9. D!10. E!11. B!12. A!13. E!14. E!15. B!16. C!17. B!18. D!19. E!20. A!21. C!22. D!23. A!24. C!25. A!!

!101. T,!T,!CE!102. T,!F!103. F,!F!104. T,!F!105. T,!F!

106. T,!T,!CE!107. F,!T!108. F,!T!109. T,!T,!CE!110. T,!F!111. F,!T!112. T,!T,!CE!113. T,!F!114. T,!T,!CE!115. T,!T,!CE!!26. C!27. D!28. A!29. B!30. D!31. D!32. E!33. B!34. A!35. C!36. B!37. E!38. B!39. A!40. B!41. E!42. D!43. B!44. A!45. B!

46. C!47. E!48. E!49. B!50. C!51. B!52. A!53. D!54. B!55. D!56. D!57. C!58. A!59. E!60. D!61. B!62. A!63. B!64. E!65. D!66. A!67. C!68. E!69. E!70. D!