Winston-Salem/Forsyth County Schools€¦ · Created Date: 6/22/2010 2:18:21 PM

2002 Advanced Placement Chemistry ExamSecticn [: Muttipte Chsice

Time - t hour and 30 minutes

NO CALCULATORS MAY BE USED WITH SECTION I.

Note: For all questions, assume that the temperature is 298 K. the pressure is 1.00 atrlosphere, and solutionsare aqueous unless otherwise specified.

Throughout the test the following symbols have the definitions specified unless otherwise noted.

T :temperature m :molalP : pressure L, mL : liter6s7, milliliterftV :volume g :gram(s)

S : entropy nm : nanometer(s)

H : enthalpy atm : atmosPhere(s)

G : free energy J, kJ : joule(s), kilojoule(s)R : molar gas constant V : volt(s)n : number of moles mol : mole(s)

' M : molar

Part A

Directions: Each set of lettered choices below refers to the numbered statements immediateiy following it. Se- i

lect the one lettered choice that best fits each statement and then fill in the corresponding oval on the answer

sheet. A choice may be used once, more than once) or not at all in each set'

Ouestions 1-2

Consider atoms of the following elements. Assume that the atoms are in the ground state.

(A) S (B) Ca (c) Ga (D) sb (E) Br l

1. The atom that contains exactlv two unpaired electrons

Z. The atom that contains only one electron in the highest occupied energy subievei

Questions 3-5 refer to the following molecules.

(A) Co2 (B) H2o (C) Cli4 (D) CzH+ (E) PH3

3, The molecuie with only one double bond

4. The molecule with the largest dipole moment

5. The molecuie that has trigonal pyramidal geometry

Questions 6-7 refer to the following solid compounds'

(A) PbSO+ (B) CuO (C) KN{no+ (D) KCl (E) FeCl:

2@2'Page 1

6. Is purple in aqueous solution

7 . is r.l,hite and vew soluble in water

O.!g$ig!S &-10 refer to the follou.ing gases at 0"C and 1 atm.

(A) Ne (B) xe (c) oz (D) co (E) No

8, Has an average atomic or molecuiar speed closest to that of N2 *oi.Juti., at 0'C and 1 atm9. Has the greatest density

10. Has the greatest rate of effusion through a pinhole

Ouestions 11-14 refer to the reactions represented below.

(A) H2SeOabd + 2 Cl-1aq) + 2H+Gq) + H2SeO3/a0 + ClzG)+ HzO(l)

(B) Ss(s) + 8 OzG) + 8 SOz(gl

(C) 3Br21aq) + 6 O}f-,,q) -+ 5Br1aq1+BrO{tuq) + 3HzOl)

(D) Ca2+1aq1+ SOqz-(aq) -+ CaSOals/

(E) PtCla(9 + 2 C|-@q) -+PtCls2-(aq)

1 1. A precipitation reaction

12. A reaction that produces a coordination complex13. A reaction in which the same reactant undergoes both oxidation and reduction14. A combustion reaction

Part B

Directions: Each of the questions or incomplete statements below is followed by five suggested answers orcompletions. Select the one that is best in each case and then fill in the corresponding oual on'ihe answer sheet.

Qucglions 15-16 relate to the graph below. The graph shows the temperature of a pure substance as it is heatedat a constant rate in an open vessel at 1.0 atrn pressure. The substance changes from the solid to the liquid to thegas phase.

t, ,. fr

Time

15. The substance is ai its normal freezing point at time

.J

EU

(A) tr (B) t: (c) t: (D) to (E) ts

16. Which of the following best describes what happens to the substance between t4 and ts?

(A) The molecules are leaving the liquid phase.(B) The solid and liquid phases coexist in equili!4um.(C) The vapor pressure ofthe substance is decreasing.(D) The average intermolecular distance is decreasing.(E) The temperature of the substance is increasing.

In which of the following goups are the three species isoelectronic; i.e., have the same number ofelectrons?

17.

(A) Sz-, K+, C42+

(D) Mg2*, Ca2+, Sr2+

(B) Sc, Ti, Yz+

(E) Cs, Ba2+,La3+

(c) oz-, s2-, cl-

?0 40 60 80 t(Ht

Tcmpcraturc (eC)

The phase diagram for the pure substance X is shown above. The temperature of a sample of pure solid Xis slowly raised from 10'C to 100'C at a constant presswe of 0.5 atm. v&at is the expecied U"rruulo,. of thesubstance?

(A) It first melts to a liquid and then boils at about 70"C.(B) It first melts to a liquid and then boils at about 30"C.(C) I1 melts to a liquid at a temperature of about 20"C and remains a liquid until the temperature is greater

than 100"C.

(D) It sublimes to vapor at an equilibrium temperafure of about 20" c.(E) It remains a solid until the temperature is greater than 100'c.

In which of the following species does sulfur have the same oxidation number as it does in H2SOa?.:'(A) H2SO3'- (B) S2q2- (C) Sz- (D) Ss (E) SO2CI2

A flask contains 0.25 mole of SO2(9, 0.50 mole of CHa1g, and 0.50 mole of Ozk). The total pressure of thegases in the flask is 800 mrn Hg. What is the partial pressure of the SOzG) in the flask?(A) 800 mrn Hg (B) 600 mm Hg (c) 250 mm Hg (D) 200 mrn Hg (E) 160 mrn Hg

In the laboratory, H21g canbe produced by adding which of the following to I MTJCllaql?i. 1 M NH3(aq) II. ZnG) II1. NaHCOrts)

(C) III only (D) I and II only (E) I, il, and Ill

2 NH3i:.NH4+ t- NH2-

DLr]

18

19

2.0.

21

(A) I only (B) II only

2002- page 3

22. Inliquid arnmonia, the reaction represented above occurs. In the reactionNtl4+ acts as

(A) a catalYst

(C) the conjugate acid ofNH3

(E) the oxidizing agerfi

luju*Jn *tfJ ct+3ln+x

23. Neutron bombardment of uranium can induce the reaction represented above. Nuclide X is which of the

(B) both an acid and a base

(D) the reducing agent

Gl Slsr tq 31no iol 3? nu

24. A,compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of 0. What is the simplest formula of

this compound?

(A) KTeO (B) KTe2O (c) K2TeO: (D) I(2TeO6

3 CzHzk) --> CsHsk)

(E)K+TeOo

25. What is the standard enthalpy change, A-FI, for the reaction represented above? (Alfyof CzHzG) is 230 kJ

mol-r; AFITof C6HaG) is 83 kJ mol-I.)

(A) -607 kJ (B) -147 kJ (c) -le kJ (D) +1e kJ (E) +773 kJ

26. Approximately what mass of CuSOa'5H2O (250 g mol-l) is required to prepare 250 mL of 0.10 M

(D) 85 g 'ii,. (E) 1a0 g

following?

(n) 33 e'

copper(il) sulfate solution?

(A)aog G)629 (c)3ag

el3l nu

2 NOfO + Ozk) -+ 2 NO2(g/

27. A possible mechanism for the overall reaction represented above is the following.

(1) Nofcl + NO/d -+ N2O2(g/ slow

(2) NzOz(g + Oz@ + 2 NOz(e/ fast

Which of the following rate expressions agees best with this possible mechanism?

tNol(A) Rate: k[No]2 (B) Rate: kid;i

ryr p) Rate: k[No]2[o2](C) Rate: k'[Orl

(E) Rate: k[N2O2][O2]

28. Of the following compounds, rvhich is the most ionic?

(A) Sicl4 (B) BrCl (c) PCl3 (D) Cl2O (E) CaCl2

29. The best explanation for the fact that diamond is extremely hard is that diamond crystals

(A) are made up of atoms that are intrinsically hard because of their electronic structures

(B) consist of positive and negative ions that are strongly attracted to each other

(C) are giant molecules in which each atom forms strong covalent bonds with all of its neighboring atoms

(D) are formed under extreme conditions of temperature and pressure

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(E) contain orbitals or bands of delocalized electrons that belong not to single atoms but to each crystal asa wnole

30. At 25"C aqueous solutions with a pH of 8 have a hydroxide ion concentration, [OH-], of(A) 1x10-t+,y (B) I x10-8 M (C) I x10{ M (D) I M (E)8M

CSz(r) + 3 Oz@ -+ COz@ + 2 SOz@

31. What volume of Oz@ is required to react with excess CSzdl to produce 4.0 L of COzG)? (Assume all gasesare measured at 0"C and 1 atm.)(A) 12 L (B) 22.4L (C) tr: x22.4L (D) 2 x22.4L (E)3 x 22.4L

32. Which of the following oxides is a gas at25'C and 1 atm?(A) Rb2O (B) N2O (C) Na2O2 (D) SiO2 (E) La2O3

Questions 33-34

The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with0.100 MNaOH. - T"

t4.0

t2,0

t0.0

pH 8'0

6.0

4.0

?.()nn I lfr I I _r--0 5 t015?0?530354045

mL of 0.100 $f l.faOl{ Addcd33. Which of the following indicators is the best choice for this titration?

pH Range ofColor Change

3.2 - 4.4

4.8 - 6.0

(C) Bromothymol blue 6.1 - 7.6(D) Phenolphthalein 8.2 - 10.0

(E) Alizarin 1 1,0 - 12.4

34. What part of the curve corresponds to the optimum buffer action for the acetic acid/acetate ion pair?

Indicator

(A) Methyl orange

(B) Methyl red

(A) Point V(C) Point Z(E) Along all olsection YZ

(B) Point X(D) Along all of section Wy

35. A solution is made by dissolving a nonvolatile solute in a pure solvent. Compared to the pure solvent, thesolution

(A) has a higher normal boiling point-,

(B) has a higher vapor presswe

2002- page 5

(C) has the same vapor Pressure

(E) is more nearly ideal(D) has a higher freezing point

36. A sample of a solution of an unknown was treated with dilute hydrochloric acid. The white precipitate

formed was filtered and washed with hot water. A few drops of potassium iodide solution were added to

the hot water filtrate and a bright yellow precipitate was produced. The white precipitate remaining on the

filter paper was readily soluble in ammonia solution. What two ions could have been present in the

unknown?

(A) Lg+ 1aq1 andHg22+ 1aq1

(C) Baz+1nQ and Ag+{aa)

(E) Baz+ 1aq) and Pb2+ (aq)

When the

lCorz-lIHCO:-]

lBl Ag+@q) andPb2+1aq1

(D) Ba2+6a e and Hgz2* (oq)

JI

38.

HCOz-Gd + OH-@q) ilnzOO + COz2-(aq) AH: -41.4 kJ

reaction represented by the equation above is at equilibrium at 1 atm and 25'C, the ratio

can be increased by doing which of the following?

1Af necreasing the temPerature

(C) Adding a catalYst

(E) Bubbling neon gas through the solution

A 0.10 Maqueous solution of sodium sulfate, Na2SO4,

aqueous solution of sodium chloride, NaCl. Which of the

(A) Na2SO+ is more soluble water than NaCl is.

(B) Na2SO4 has a higher molar mass than NaCl has.

(C) To prepare a given volume of 0.10 Msolution, the

Adding acid

diluting the solution with distilled water

is a better conductor of electricity than 0.10 Mfollowing best explains this observation?

(B)(D)

mass of NazSOq needed is more than twice the

mass ofNaCl needed.

(D) More moles of ions are present in a given volume of 0.10 MNa2SO4 than in the same volume of 0.10

MNaCl.(E) The degree of dissociation of Na2SOa in solution is significantly greater than that of NaCl.

2OO2- page 6

u _^; 16{,3qi,

xT rroqr.i.

I*fi, 80

,\

3 .loottt

' t0 20 30 40 50 60 ?0 s0 g0 100

Tcmperature 1oC)

39. On the basis of the solubility curves shown above, the greatest percentage of which compound can berecovered by cooling ajaturated solution of that compound from 9d'C to 30"C?(A) NaCl (B) KNO3 (C) K2CrO+ (D) KzSOa (E) Ce2(SOa)3

40. An excess of Mgi4 is added to 100. mL of 0.400 MHCI. At 0"C and 1 atm pressure, what volume of H2 gascan be obtained?

(A) 22.4 mL (B) 44.8 mL (C) 224 mL (D) 448 mL (E) 896 mL

41. When solid NHqSCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas isproduced. Which of the following indicates the correct signs for LG, LH,and AS for the process?

AG AH AS(A) -(B)- +

(C)- + +

(D)+ +

(E) +

Hzk) + Brz@ "'l z tnrraAt a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is2.0x 105. What is the value of K for the reverse reaction at the same temperature?(A)-2.0x10-5 (B)50x10-6 (C)2.0x10-5 (D)5.0xt0-5 (E)5.0xt0_4

The atomic mass of copper is 63.55. Given that there are only two naturally occuning isotopes of copper,63Cu and 65cu, the natural abundance of the 65cu isotop* musib" approximately

@) 25%

1;

+z

43

(A) e0% (B) 70% (c) 50% (E) 10%

2002- pageT

44. Which of the following properties generally decreases across the periodic table from sodium to chlorine?

(A) First ionization energy

(C) ElectronegativitY(E) Atomic radius

(B) Atornic mass

(D) Maximum value of oxidation number

46

45. What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46 percent ethanol by mass?

(The molar mass of CzHsOH is 46 g; the molar mass of H2O is 1B g.)

(A) 0 2s (B) 0,46 (c) 0 54 (D) 0.67 (E) 0 75

The effective nuclear charge experienced by the outermost electron of Na is different than the effective

nuclear charge experienced by the outermost electron of Ne. This difference best accounts for which of the

following?(A) Na has a greater density at standard conditions than Ne.

(B) Na has a lower first ionization energy than Ne.

(C) Na has a higher melting point than Ne.

(D) Na has a higher neutron-to-proton ratio than Ne.

(E) Na has fewer naturally occurring isotopes than Ne.

Which of the following is a correct statement about reaction order?

(A) Reaction order can only be a whole number.

(B) Reaction order can be determined only from the coefficients of the balanced equation for the reaction

(C) Reaction order can be determined only by experimenty'

(D) Reaction order increases with increasing temperature.

(E) A second-order reaction must involve at least two different compounds as reactants.

Sodium chloride is LEAST soluble in which of the following liquids?

(A) H2O (B) CC14 (c) Ff (D) CH3OH (E) CH3COOH

... Cr2O72-@q) + HzSfd + ... H+1aq1 -> ... Cr3+1od + ... S1"/ + ... }jzAr.)

49. When the equation above is correctly balanced and all coefficients are reduced to lowest whole-number

terms, the coefficient for Wbd is

(A) 2 (B) 4 (c) 6 (D) I (E) 14

50. Which of the following represents acceptable laboratory praetice?

(A) Placing a hot object on a balance pan

fBJ Using distilled water for the final rinse of a buret before filling it with standardized solution

'{C) Adding a weighed quantity of solid acid to a titration flask wet with distilled water

@) Using 10 mL of standard strength phenolphthalein indicator solution for titration of 25 mL of acid

solution(E) Diluting a solution in a volumetric flask to its final concentration with hot water

47.

48

2002- page I

51.

3 Cu@ + 9H+Gd + 2 NO:-(ail -+ 3 Cu2+1aq1+ 2 NOfgi + 4HzO(t)

True statements about the reaction represented above include which of the following?L Cu(s/ acts as an oxidizing agent.

II. The oxidation state of nitrogen changes from +5 to +2.m. Hydrogen ions are oxidized to form H2O1t1.

(A) i only (B) Ii only (c) rrl only (D) I and Ir (E) rI and rlr

Propane gas, C3Hs, burns in excess oxygen gas. When the equation for this reaction is correctly balancedand all coefficients are reduced to their lowest whole-number terms, the coefficient for 02 is(A) 4 (B) 5 (c) 7 (D) 10 (E)22

According to the VSEPR model, the progressive decrease in the bond angles in the series of moleculesCFI4, NH3, and H2O is best accounted for by the

(A) increasing strength of the bonds(B) decreasing size of the central atom(C) increasing electronegativity o{the central atom(D) increasing number of unshared pairs of electrons(E) decreasing repulsion between hydrogen atoms

Which of the following must be true for a reaction for which the activation energy is the same for both theforward and the reverse reactions?

(A) A catalyst is present.

(B) The reaction order can be obtained directly from the balanced equation.(C) The reaction order is zero.

(D) Ali for the reaction is zero.

(E) AS for the reaction is zero.

Time(days)o/o Reactantremaliln

52.

53.

54,

55. A reaction was observed forrecorded in the table above.reaction?

.4- t"

and thbrqercentageff thp reactant remainingof the follo\urng-b/est desc'r.ibes _the older and

20 daysWhich

after each day wasthe half-life of the

Reaction Order(A) First(B) First(C) Second

(D) Second

(E) Second

Half-life (davs)aJ

t03

6

l0

The boiling points of the elements helium, neon, argon,of the following statements accounts for this increase?

(A) The London (dispersion) forces increase.

(B) The hydrogen bonding increases.

in that order. Which56 krypton, and xenon increase

2OO2- page 9

(C) The dipole-dipole forces increase.

(D) The chemical reactivity increases.

(E) The number of nearest neighbors increases.

1

Rate:,t[MF{]2

57. The rate of a certain chemical reaction between substances M and N obeys the rate law above. The reactionis first studied with ffi and [N] each I x 10-3 molar. If a new experiment is conducted with [M] and [N]each2 " 10-3 molar, the reaction rate will increase by a factor of(A) 2 (B) 4 (c) 6 (D) 8 (E) 16

2NzTIqfd + NzO+(9 -+ 3 N2(g/ + 4HzO@

5 8. When 8.0 g of N2H4 QZ I mol-t; and 92 g of N2Oa (92 g mol-l) are mixed together and react according tothe equation above, what is the maximum mass of H2O that ean be produced?

(A) e.0 e (B) 18 g (C) 36 e (D) 72 g (E) laa g

59. All of the halogens in their elemental form at 25"C and,l atm are

(A) conductors of electricity (B) diatomic molecules,(C) odorless (D) colorless(E) gases

.j

2HzOO + 4 MnO+-@Q + 3 ClO2-@q) -+ 4 MnO2 @ + 3 ClOa*@q) + 4 OH-@q)

60. According to the balanced equation above, how many moles of ClOz-fad are needed to react completelywith 20. mL of 0.20 MKMnOa solution?

(A) 0.0030 mol (B) 0.0053 mol (C) 0.0075 mol (D) 0.013 mol (E) 0.030 mol

61. How can 100. mL of sodium hydroxide solution with a pH of 13 00 be converted to a sodium hydroxidesolution with a pH of 12.00?

(A) By diluting the solution with distilled water to a total volurne of 108 rnl-(B) By diluting the solution with distilled water to a total volume of 200 mL(C) BV diluting the solution with distilled water to a total volume of 1.00 L(D) BV adding 100. mL of 0.10 MHCI

G) By adding 100. mL of 0.10 MNaOH

HHHrllH-C-C-C-BrrltHHH62. Which of the following sffuctwal formulas represents an isomer of the compound that has the structural

formula represented above ?

HHH HHHltttll(A) Br-C-C-C-H (B) H-C-C-C-H

ttlltlH HH HBTHHHH H HH

2002- page 10

.l ll ttl(C) H-C-C-C-H (D) Br_C--i_c_e,lltlllH HBT H HHHHHHlllt

(E) H-C-C-C-C-BrtttlHHHH

63. Mixtures that would be considered buffers include which of the following?l. 0 10 MHCI + 0.10 MNaCI uII. 0. 10 MI-IF + 0. 10 MNaF rr'

(A) I only \(B) )r only (c) Irr only (D) r and rr (E) rr and rrr\/

64. Ascorbic acid, H2C6H6O6ft), is a diprotic acid with K1 : 7.9x10-5.and K2 : 1.6x10-12. In a 0.005 Maqueous solution of ascorbic acid, which of the following species is present in the lowest concentration?(A) HzOot (B) H3O+1aq1 (C) H2C6H oOe@q)(D) HC6HoOo-kil (E) C6H6Oa2-(oq)

65. which of the following substances is LEAST soruble in water?(A) Ci{}Id?f,o4 (B) KMnq (c) Baco: @fzn(\Te)l (gNa:po+_

66. A 2 L container will hold about 4 g of which of the following gases at 0"C and 1 atrn?(A) SO2 (B) Nz (c) coz (D) C4H8 (E)NH:

67 Which of the following describes the changes in forces of attraction that occur as H2O changes phase froma liquid to a vapor?

(A) H-O bonds break as H-H and G-O bonds form.' (B) Hydrogen bonds between H2O molecules are broken.(C) Covalent bonds between H2O molecules are broken.(D) Ionic bonds between H+ ions and OH- ions are broken.(E) Covalent bonds between H+ ions and H2O molecules become more effective.

2042- page 11

t00

90

^80U"--, ?0g

*eoa-J

FsoTJF41

30

?0 012 3 4 5 6 7

'l"rnrc {mlnutcs)

68. Liquid naphthalene at 95"C was cooled to 30"C as represented in the cooling curve above. From whichsection of the curve can the melting point of naphthalene be determined?

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

water, what is the concentration of69. If 200. mL of 0.60 M MgClz(aqi is added to 400. mL of distilled

Mgz*(oq) in the resulting solution? (Assume volumes are additive.)

(A) 020M (B) 0.30 M (c) 0.40 M (D) 0.60 M (E)1.2 M

70. Of the followng pure substances, which has the highest rnelting point?

(A) Ss (B) Iz (c) sio2 (D) SO2 (E) C6H6

71. In the electroplating of nickel,0.200 faraday of electrical charge is passed through a solution of NiSOa.

What mass of nickel is deposited?,it

(D) 58.7 g(N 29a g (B) 5.87 g (C) 11.7 e (q2ea s

72. A colorless solution is divided into three samples. The followingtests were performedon samples of thesolution.

Sample Test

1 AddF(aq) No change

2 Add NH3(aql No change

3 AddSOq2*(aq) No change

Which of the followrng ions could be pre sent in the solution at a concentration of 0.10 A.A ,\ .,(A) Ni2+1aq7 (B) Al3+1aq) {C) Ba2+1aq1

xr't tr xot

(D) Na+1aq; (E)COzz-faqt

Observation

Which of the following is true for any substance undergoingrnelting point?

(A) As < 0 (B) AH: 0 (C) AH : TLG

the process represented above at its normal

(D) r^s: 0 (E) AH: r s

73.

2OO2- page 12

74i A pure, white crystalline solid dissolves in water to yield a basic solution that liberates a gas when excess':." acid is added to it. on the basis of this information, the ,oria ,ouia u.(A) KNo: (B) K2Co: (C) KoH (D) KHSg+ (E)KCI

75' rn a saturated solution of Zn(oH)2at25'c the value of [oH-] is 2.0x10-6 M.whatis the value of thesolubility-product constant, Krp, for Zn(OH) 2 at25"C?(A) 4.0,10-ts (B) 8.0x10-rs (c) 1.6x10-r7 (D) 4.0*to-rz @)2.0x10_6

item answer% correct by grade

54321iotal%correct

1 A 80 71 65 59 46 632 c OE 87 77 64 e.o 70

D 91 85 79 72 52 744 B 85 70 45 29 54E E 90 82 77 72 61h r. 81 67 56 r+b J57 D B4 71 ol 53 43 ot

D 81 RO 40 26 4E 41o B 88 80 t,5 67 5510 A 91 79 63 49 28 5911 D 99 98 92 82 49 Q'

12 E 69 42 25 16 11 3013 c 94 84 73 59 4A 6714 B 97 91 82 68 44 7415 B on 74 56 42 2aJZ 5616 A 89 60 47 32 5817 A 97 91 80 oz+ 35 7A18 D 97 92 79 6'l 31 AO

19 E 97 91 81 65 38 722A E 94 85 74 60 36 ea

21 o 85 c1 E4 36 19 4822 857361483223 D 63 49 38 29 18 3724 c 98 95 88 79 qo 8225 A 92 83 73 60 36 66lo B 89 77 63 44 23 56

A 83 OJ 47 32 16 4528 E o2 84 74 61 39 6829 r- 86 68 54 20 l4 5130 94 87 80 69 42 tl31 A 92 78 60 43 23 561a B 89 79 71 64 52 bvaa D 94 86 76 63 43 7A34 50 JZ 19 10 342E A 74 53 39 'A

91 EA

36 B 35 26 21 II51 l637 A 85 65 44 29 2A 4538 D 97 84 64 30 61

2ss2 AF chemaistny Exaraa - Maefltipfle choiee Axaswex-s

I I | 't" correct ov gr"d" Tt"t"l ';-lAverage o/o conect :VERY EASY (80*100% correct), 2.7% LtI,24l

EASY {60-79% conect), 33j% 11,'2"3,5,7,g,13, \4,17,rg,79,2a,2s,2g,30,3i,32,33,3g,39,44,46,52,53,56f

MEDILMDIFFICIILTY(40-5gokcawect),4a.0% 14,6,g,10, i5, "16,2r,22,26,27,29,3r,3s,37,41,43,

45,49,51,54,55,57,59, 59, 60,65,66,6j,6g, 69l -> --', -->

I{ARD Qa49% eorrect),22.7% rrz,23,3a-,,36,40"42"47,49,6T,62,63,64,70,72,23,74,75}

\ryR.YF{ARD (0-i9% correct), 2.7% fiA,7ij

item answer A a!l

a1 correct

39 B 94 87 76 66 7240 D 69 47 25 12 B ,o41 83 63 42 25 rA 4342 B 62 2U 11 24.+J D 78 51 40 4944 E ot 85 76 6S 42 70

A 88 67 44 24 1E 4446 B 8S 74 65 56 JO 6247 69 52 3S 29 17 3948 B 85 66 48 35 23 4849 D 64 3S 27 21 16 JI50 3B 22 14 68 toR1 B IL 54 34 14 49

B o? 88 79 66 ?o 7153 D 94 83 A'7 50 30 6254 D 79 60 43 29 18 43AT A 74 63 EA E4JI 38 EE

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