New Jersey Science League" Chemistry II Exam January 2015 YELLOW TEST

Answer the following questions on the answer sheet provided. Each correct response is worth 4 points.Use the letters in parentheses for your answers. Choose the letter that best completes or answers the item'

Be certain that erasures are complete. Please PRINT your name, school, atea #, and which test you are

takins on the scan-tron.1. The density of marble chips is determined by water displacement method and the followingdata are obtained.

Mass (e) Volume (mL)4.0 2.06.0 3.09.0 4.0t2.0 5.015.0 6.025.0 10.0

The density of marble is 2.50 glmL. What is the closest to the percent error of the student'sexperimental determination?

A. s.0% B. t5% c.20% D. 83%

2. The photoelectron spectrum (PES) below shows the binding energies for all electrons inneutral element Q.

Rsiativ* *tagbercf r}rckaes

PES *fekroelrt Q

58tV $etrr13*S ellThe element Q belongs to the Group _

1** eV

of the periodic table.

c.14 D. 18A.2

3. Which has the most C

A. 10.0 mg of CaCO3

B.5

atoms?

4. For which pair of species isA. Na and Cl

B. 12.0 mg of CaC2 C.4.0 mg of COz D. 8.0 mg of CO

the difference in radii the sreatest?B. N/ and Cl- C. N:a* and 52- D. Cf and 52-

NfSL Chem II fan 2015 Page 1

5. 100.0 mL of a 0.10 M Pb(NIO3)2 aq. solution is added to 100.0 mL of a 0.30 M CaCl2 aq.solution. Which ion has the hiehest concentration in solution after the chemical reaction isterminated?

A. Pb2* B. NO:- C, CT* D. CT

6. Cu2S + HNO: -+ CuQ.{Or)2 + CuSOa + NO2 + HzO

When the above equation is balanced using the smallest whole-number coefficients, thecoefficient of NOz will be equal to

A.12 B. l0 c.8 D.6

7 . 20.0 g of M2O7 react with excess Hz according to the following equation:MzOt + 7Hz -> 2M + THzO

If only 5.20 gof water are produced, what is the identity of the metal?

A. Mn B. Mo C. Ru D. Re

8. 250.0 mL of a 0.10 M HCI are added to a beaker containing 1.00 g of CaCO:. The beaker isheated to dryness. What is the mass of the dry residue in the beaker?

CaCO3(s) +2HCl(aq) + CaClz@q) + COz@) + H2O(l)

A.1.73 g B. 1.11 g C.1.29 g D. 1.91 g

9. In which of the following chemical equations did the oxidation state of N remain unchanged?A. Cu(s) + 8HNO3(aq) -+ Cu(NO:)z(aq) + 2NO(g) + }i1O(DB.2No(g) + Ozk) -+ 2Nozk)C. NzO:(s) + HzO(D -+ 2HNO3(aq)D. NFI+NO:(s) -+ NzO(S) + 2HzO(s)

10. A compound is made of Mg, P and O. Which of the following compounds containsapproximately 50o/o of oxygen by mass?

A. Mg3(PO4)2 B. Mg2P2O7 C. Mg(PO3)2 D. MgPO2

11. What is the oxidation state of phosphorus in the compound POCI3?

A.+5 B. +3 c.0 D. -3

12. Copper has two naturally occurring isotopes: copper-63 and copper-65. The average atomicmass of copper is 63.54 amu. What is the ratio of the natural abundances of these two isotopes(copper-63 :copper-65)?

A.2:l

NISL Chem II fan 2015

B. 1:3

PageZ

C.3:l D.4:3

13. The term'.ALUM" refers to a class of compounds of general formula QZ(SOa)2.l2HzOwhere Q and Z aretwo different metals. A 25.00 g sample of a certain alum is heated to drive offthe crystal water; the anhydrous residue weighs 14.264 g. Treatment of the residue with excess

NaOH precipitates all the Z as Z(OH): which weighs 5.355 g. Identify the two metals.

A. K and Al B. Na and Al C. K and Cr D. K and Fe

14. Ableach sample is analyzed for its NaCIO content. It is found that a 10.0 g sample of bleachrequires 40.50 mL of 0.500 M NazSzOg solution to reach the endpoint of titration. What is the

mass percent of NaCIO in the bleach?

NaCIO + 2Na2S2O3 + 2HCl -+ 3NaCl + NazSaOo + H2O

A.7.54% B. 13.4% C.zA.l% D.26.4%

15. A 1.500 g sample of solid CaCO: is dissolved in 25.00 mL of 1.000 M of HCI solution. Theexcess amount of HCI is titrated with 0.100 M NaOH solution. The endpoint of the titrationrequired 23.40 mL NaOH solution. What is the percent CaCOg in the sample?

CaCQ(s) + 2HCl(aq) + CaClz@q) + COz(g) + H2O(D

A.96.7% 8.75.3% C.50.8% D.25.4%

16. Oxygen (Oz) and Ozone (O3) are allotropes of the element oxygen. Which of the followingpairs is NOT an allotropic pair?

A. Cgraphite and C6irrron4B. rhombic sulfur and amorphous sulfurC. white tin and gray tinD. nitrogen-I4 and nitrogen-l5

17. Green light breaks the bond between two chlorine atoms. Which of the following lights canalso break the bond between the chlorine atoms?

A. Blue B. Yellow C. Red D. Orange

C. Chromium(Vl) carbonateD. Chromium(Vl) carbonite

19. Which species canact as an oxidizingagent but NOT as a reducing agent?

A. NOz B. NO:- C. Cu* D. CIO-

20. What is the ground state electron configuration of the nickelous ion?

A. [Ar] 3d 4s2 B.tArl 3f 4s2

18. The correct name of Cr(COz): isA. Chromium carbonateB. Chromium carbonite

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C. tArl 3l D. ttul 3d 4st.

21. Consider the following equation:2CaH1s +13Oz -+ 8COz + 10H2O

when 100.0 g of caHro react with 100.0 $ of 02, the maximum amount of coz produced is

A. 84.6 g 8.42.3 g C.194 s D. 304 g

22. Consider the following reactions:QClz@d + Z(s) -) no reactionMrCrzi.rld +Q(s) +M(s) +QClz(s)MClz/.rld + Z(s) + M(s) + ZCl2@q)

What is the correct order of increasing activity for the metals M, Q and Z?

A.M

Periodic Table and Chemistry Formulas

l8

Hl_0079

) Periodic Table of the Elemlamu to 5 significant digits]

3 6 I 9 t0

nts t3 l4 15 16 t71

He4.m/26

J

Li4

Be9.Or22

l1 12

5

B6

Cl2.0lt

7

Nrtw

E

o9

Fl0Ne

ltNa Mg

t3

A1t4

Sit5

Pl6

Sl7

CIl8Ar

t9

K20

Cazl

Sc Ti23

V24

Crt<

Mn26

Fe27

Co2a

Ni29

Cu50

Zn31

Ga32

Ge33

As34

Se35

Br36

Kr

Rb38

Sr39

Y40

Zr4lNb92.906

42

Mo43

TcuRu

45

Rht6

Pd Ag48

Cd49

In50

Sn119 1l

5t

Sb52

Te5J

I54

Xe

Cs56

Ba7lLur74.97

a)

Hf Tal8{r..x

74w Re76

Os77

Ir78

Pt79

Au 'hgt1

TIa2

Pb83

Bit4Po

t5

At86

Rn

a1

Fr88

Ra103

Lr104

Rf105

Db106

Sgl07

Bh108

Hsla11\

109

Mt110

DslllRg

lt2Uub

113

Uutattrl

tt4uuq

atas)

uuplt6 tt7 ll8

LanthanidtSeries

ActinideSeries

CHEMISTRY FORMULASGASES, LIQUIDS,

SOLUTIONSPV: NRT

(P + n2a) (V-nb) - nRTv'

P4: P1o14 r X4

Rota:Pe + PB + Pc+

n=r4M

Kelvin:'C +273

P1V1 : P2V2

Yr:&Tr T2

prvr=&_\!Tr T2

KEp"rrol""ut": -!4y'z

KE pe. mole =

Fnr=\ M

rt@;: \M,

d:laV

P: pressureV: volume

T: Temperaturen : number of moles

d: densityln: MASS

v: velocitywhere Xa: moles A

total moles

ums : root-mean-square-rootKE: Kinetic energyr: rate of effusionM: Molar mass

n: osmotic pressurei = van't Hoff factor

K6: molal freezing pointconstant

K5: molal boiling pointconstant

Q: reaction quotientI :current in amperes

q: charge in coulombst: time

Eo : standard reductionpotential

Keq : equilibrium constant

R, Gas constant : 8.3 I JoulesMole Kelvin

:0.0821 liter atmmole Kelvin

:8.31 volts coulombsmole Kelvin

Boltzmann's constant,k : 1.38 x 10-23 Joule

KKr*"t",: 1.86 Kelvin /molal

Kb wate. : 0.512 Kelvin /molal

STP:0.00 oC, 1.00 atm (101.3 kPa)

I faraday 5 :96,500 coulombs/ mole ofelectrons

3RT2

M. molarity : moles soluteliter of solution

molality: moles of solutekg of solvent

ATl: iKsr molality

AT6:iK6omolality

n: nRTiV

3kt

m

ATOMTC STRUCTUREAE:hvc=v),

En=

L: hmv

p:mv

-2J-78-xl-Q*n joulen2

E : energYv : frequencyl" : wavelengthp - momentumv : velocity

n: principal quantum numberc : speed of light 3.00 x l0o m/s

h : Planck's constant: 6.63 x lO-3aJoule sk: Boltzmann

constant : 1.38 x I 0-23 joule/K -Avogadro's number: 6.02 x 10"

molecules/mole

e : electron charge : -l .602 x I 0-1ecoulomb

I electron volt/atom = 96.5 x 1023 kj/mole

OXIDATION-REDUCTIONELECTROCHEMISTRY

a: LCfrDIllAr[Bl"

where aB+ bB

d0& tr90r tr80r tr70r tr601tr50r tr40r tr30r c201 tr10rtr9r tr8r tr7- tr6r tr5rtr41 tr3r .2a tr1: tr0r

PART 1

r'lT

z;tom

Fn.}

=rx

=|--

@

e3

39p6

?6@5-er

Fa6E!@nm

m,mI

U'=vx2an2zo

triitnci!-I

drnrno:oz

I

N

:\

I

;=

m

I

,(r) (F)*-

1*trBr2*trBr3.A= trB:4.A= trBr5.A= trBr6 .A' {r7 .A= cBr8 cA: tt9.A= trB:

10 cA: 511

- trBtr

12 trAr trBr13 trAr trBl14

- trBr

15 trA: rD16 trAr trBr17 * trBr18.A= trBr19 cA: r|r20 .A= trBr21 * trBr22 trAr tf23 trAr rD24 .A- trBr25 * trBr26 .A= trBr27 .Ar trBr28 .A= trBr29 .A= cBr30.A. trBr

KEY

tr3r *trCr trDr trErtrCr trD: trErtrCr tts EEr

f cD: trErtrCr f; cf:trCr trDr trErcQ: ap cf:trCr trDr trEr

f cP: trEltrCr trDr trErrCr trDr trE:

f cD: trErtrCr

- trEr

trCr trD: trErtrCr trDr trErcC: lF rE:trCr trDr tr ErtrCr ilF trErtrCr trDr trEr

- trDr trEr

trCr trDr trErtrCr trDr trE:trCr trDr trErcQr rlr trE:trCr trDr trE:trCr trDr trErtrCr trDr trEltrCr trD: trErtrCr trDr trErtrCr trDr trEr

31 trAr trBr32 trAr trBr33 .A= EBr34 .At trBr35 .Ar trBr36 -A= trBr37.A= trBr38 -A= trBr39 -A= trBr40 .A. trBr41 trAr trBr42 trAr trBr43 .A- trBr44.A= trBr45 trAr trBr46 trAr trBr47.A= trBl48 .A= trBr49 trAr trBr50 trA:.Br

trCr trDr trE:trCr trDr trEltrCr trDr trErtrC: trDr trErtrCr trDr trEltrC: trDr trErtrCr trDr rEltrCr trDr trErtrCr trDr trEltrCr trDr trErtrCr trDr trErtrCr trDr trErtrCr trDr trErtrC: trDr trErtrCtr trDr trErtrCr trDr trErtrC: trDr trEltrCr trDr rErtrCr trDr trErtrCr trDr trEr

q

!I

I

q 6s =E eA n

# =il

E_ m= x;P-inEmx'tol3

io3

6o+eq i ,di EE 8Et -il um=! =

fi,^

i i"= *H5 5 9 >Eo = =mo* HQ-4 :i no4liEP

imT

IMG_0032IMG_0033IMG_0034IMG_0035IMG_0036IMG_0037IMG_0038