Test 2 Ec Spring 08

8/8/2019 Test 2 Ec Spring 08

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Elmhurst College Chemistry Exam II Name______________________

Date _______________________

Tally Sheet

Page Problem # Points Sum Actual

2 1-8

3 9-16

4 17, 18

5 19- 27

6 (28), 29- 31

7 32 358 36 40

9 - 10 AdditionalMaterials

1


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Elmhurst College Chemistry Exam II Name______________________

Date _______________________

.

1)

2


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All ofthefollowing arebasesexcept


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1)


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_______A)


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HNO3.


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B)


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KOH.


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C)


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Phosphoricacid isaddedtomanypopularbeverag

es togivethem atartflavor.

Theformulaofphosphoricacid is


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2) ______ _A)


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H3PO4.


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B)


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HPO4.


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C)


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D) H 4


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Whenaddedtowater,whichone ofthefollowin

g wouldproduceanacid?


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3) ______ _A)


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Na


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B)


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C)


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NH3


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D) M gO


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In thebalancedchemicalreactionfor theneutrali

zationofcalciumhydroxide withnitricacid,HNO3,

thecoefficient ofnitricacid is


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4) ______ _A)


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1.


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B)


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2.


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C)


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3.


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D) 4 .

(Show

yourwork forfull

credit)


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Whichof thefollowing is thecorrectbalancedequatio

n fortheneutralizationofbariumhydroxide withsulfuricacid?


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5) ______ _A)

BaOH

2

+

H2SO

4BaSO

4+

H2O


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Ba(OH)2 + 2 H2SO4 Ba(SO4)2 + 2 H2O

6)


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What isproduced in anacid-baseneutralizationreaction

?


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6) ______ _A)


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a base


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B) an acid


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a salt andwater


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D) an acid and water

7)


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The pHof asampleofwaterfrom ariver is6.0. A

sampleofeffluentfrom afoodprocessingplanthas apH of4.0.

Theconcent

rationofhydronium ionin theeffluentis


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7) ______ _A)

fourtim

es(4x)large

rtha

ntheriverhy

droniumionconcent

ration.


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100 times (100x) larger than the river hydronium ion concentration.D)


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one and a half times (1.5x) larger than the river hydronium ion concentration.

8)


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Anunknownsubstance isaddedto asolution

and thepHdecreases. Thesubstance isbestdescribed asa(n)


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salt.


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B)


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base.


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C)


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acid.


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D) s ol


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Whentheequation belowisbalanced, thecoeffici

ent ofHCl is:

AlCl3 +

H2SO4Al2(SO4)3 +

HCl


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9) ______ _A)


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6


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12


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D) 2


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10) ______A)


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B)


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1


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C)


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3


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D) 1 2

(Show

yourwork for

fullcredit)


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Whentheequation belowisbalanced, thecoeffici

ent ofsodiumcyanideis:

NaCN+H2SO4Na2SO4+ HCN


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11) ______A)


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4


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B)


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2


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C)


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3


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D) 1


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12) ______A)


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1


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B)


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C)


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3


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D) 2

(Show

yourwork forfull

credit)


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Whichof thefollowing iscorrect,according toAvogad

ro'shypothesis?


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13) ______A)

AtS

TP,

1Lofoxygen

gasan

d1Lofliquidwa

tercontainthesamenumbe

rofmolecules.


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At STP, equal volumes of gases contain the same number of molecules.D)


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At STP, equal volumes of gases contain equal masses.

14)


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At STP,22.4liters ofoxygengas,O2, will

have amass of


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14) ______A)


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32.0 g.


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B)


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16.0 g.


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C)


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28.0 g.


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D) 2 2.


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Aspirinhas aformulaC9H8O

4. The

molarmass ofaspirin

is


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15) ______A)


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220 g.


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B)


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95 g.


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180 g.


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D) 3 25

(Show

yourwork forfull

credit)


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Thedensityof O2gas atSTP is


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16) ______A)


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1.43 g/L.


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B)


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1.69 g/L.


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C)


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0.714 g/L.


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17)


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In thereactionCH4 +

2 O2

CO2 +

2 H2O

howmanymolesofoxygenarerequired toburn8.0 g ofmethane?


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17) ______A)


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0.5


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B)


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2.0


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C)


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32


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Aballoonisinflatedoutdoors on acoldday in

NorthDakotaat atemperature of-40Cto avolumeof 2.00L. Thepressureremains

constant. Whatis thevolumeof theballoonindoorsat atemperature of25C?


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18) ______A)


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B)


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2.0 L


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C)


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2.6 L


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D) 1 .6

(Show

your

work forfullcredit)


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Use theidealgas lawtocalculate thevolumeoccupie

d by0.200mol ofnitrogen gas at1.00atmpressure andat 27C.R =0.0821

L* atm/

(K*mol).


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19) ______A)


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4.9 L


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B)


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22.4 L


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C)


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0.44 L


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D) 0 .0


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Themolarity of asolutionthatcontains 0.5moles

ofNaOHin 200milliliters ofwater is


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20) ______A)


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0.5 M.


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B)


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2.5 M.


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1.0 M.


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D) 0 .2


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Withrespecttochemicalbonding, whichparticle

s playthemostactiverole?


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21) ______A)


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valenceelectrons


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B) prot ons


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coreelectrons


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D) neu trons

22)


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Afluorideion is


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22) ______A)


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F+.


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B)


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F2-.


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C)


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F-.


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D) F 2


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Whenmagnesiumreactswithchlorine, thereaction

involvesa


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23) ______A)


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sharing ofelectronsbetween Mgand Cl.


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B) tran sfer of Cl to Mg.


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creation ofelectrons.


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D) tran sfer of Mg to Cl.

24)


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Whichone ofthefollowing hastheLOWES

T

electronegativity?


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fluorine


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B)


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oxygen


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sodium


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D) c hl


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Atomsandmolecules withoddnumbers ofelectron

s arecalled


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25) ______A)


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B)


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odd.


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C)


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D) f re


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Amolecule thathas apartialpositivechargeon one

end andapartialnegativechargeon theotherend is a


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dipole.


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B) non polar molecule.


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binarymolecule.


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D) line ar molecule.

27)


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What isthepredominantforcebetween IBrmolecul

es inliquidIBr?


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27) ______A)


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dispersionforces


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B) dip ole forces


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covalentbonds


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D) hyd rogen bonds

28)


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. Select the nuclide that completes the following nuclear reaction.

41

A)

B)

C)

D)

E)


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29)


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What

v

o

l

u

m

e

o

f1

8

.

0

M

s

u

l

f

u

r

ic

a

c

i

d

m

u

s

t

b

e

us

e

d

t

o

p

r

e

p

a

r

e

1

5

.

5

L

o

f

0

.

1

95 MH2SO4?

a. 0.336 L

b. 226 mL

c. none of these

d. 92.3 mL

e. 168 mL


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29) ______(Show your work for full credit)

30)


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H

o

w

m

a

n

y

g

r

a

m

s

o

f

C

a

C

l

2

(m

o

l

a

r

m

a

s

s

=

1

11

.

0

g

/

m

o

l

)

a

r

en

e

e

d

e

d

t

o

p

r

epare 5.91 L of 0.500 MCaCl2 solution?

a. 198 g

b. 55.5 g

c. 111 g

d. 328 g

e. 297 g


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30) ______

31)


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What

n

u

m

b

e

r

o

fm

o

l

e

s

o

f

s

o

l

u

te

a

r

e

p

r

e

s

e

n

t

in

2

5

.

0

m

L

o

f

2

.

0

0

M

H

C

l

?

a. none of these

b. 0.0500 mol

c. 0.0800 mol

d. 50.0 mol

e. 2.00 mol


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31) ______


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32)


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Calcul

a

t

e

t

h

e

m

ol

a

r

i

t

y

o

f

a

s

o

lu

t

i

o

n

p

r

e

p

a

r

ed

b

y

d

i

s

s

o

l

v

i

n

g

4

.

0

9

g

o

f

N

a

I in enough water to prepare 312 mL of solution.

a. 0.0875 M

b. 0.0131 M

c. 0.175 M

d. 76.3 M

e. 1.66 M


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32) ______(Show your work for full credit)

33)


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Draw

t

h

e

L

e

w

i

ss

t

r

u

c

t

u

r

e

f

o

rK

C

N

.

What is the bond order in this molecule?


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26) ______

34)


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A

36.0-g

sample

of

acetyl

ene,

C2H2(g

), at

STP is

subjec

t to a

new

temper

ature

and

pressu

re of

35 degC and

805

mmHg.Calcul

ate

the

volume

of the

acetyl

ene

under

these

new

condit

ions.


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26) ______

35)


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An

e

m

p

t

y

g

r

ad

u

a

t

e

d

c

y

l

i

n

de

r

w

e

i

g

h

s

5

5

.

26

g

.

W

h

e

n

f

i

l

l

e

d

w

i

t

h

5

0

.

0

m

L of an unknown liquid, it weighs 92.39 g. The density of

the unknown liquid is

a. 0.743 g/mL

b. 1.67 g/mL

c. 37.11 g/mL

d. 0.592 g/mL

e. 50.0 g/mL


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35) ______


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36)


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Fill inthefollowing Table:


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36) ______

PARTICLE CHARGE MASS SYMBOL(S)ProtonNeutronElectronGamma rayAlpha particle ,Positron

37)


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Whatrangeof pH isconsideredacidic?


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C14

6

Undergoesbetadecay.Showthereaction

for thisprocess.


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38) ______

39)


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Complete the

followin

gequatio

n:

Cm23996

+0

1

= ?


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39) ______A)


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B) .


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D)

40)


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Tenmillilite

rs of a 2

mole/liter

solution

of

H2SO4are

added to

a Oneliter

flask.

Water isadded to

exactly

oneliter.

What isthe

resulting

concent

ration ofH2SO4

?(Show

your

work forfull

credit)


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AnswerSectionExam IIEC

spring08

1)

A

2)

A3)

B

4)


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B

5)


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B

6)


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C

7)


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C

8)


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C

9)


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A

10)


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D

13)


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C

14)


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A

15)


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C

16)


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D

18)


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C

19)


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A

20)


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B

21)


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A

22)


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C

23)


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D

24)


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C

25)


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B

28D29 e30 d31

b

32

is zeroto 637 6 2 0

38 = C14

6= 0

1 N

14

7

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