CH 222 Exam 2 Practice Combined

8/10/2019 CH 222 Exam 2 Practice Combined

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CH 222 Exam 2 Practice with Key (Key follows the pristine Exam)

1. Which is the higher pressure

!. 2""" torr

#. 2.$ atmC. 2%$ &Pa'. 2 1"mm HgE. *he pressure on the top of +t. E,erest.

2. Which of the following statements a-out gases is */E

!. 0f the amount of a sample of an ieal gas is ou-le while the pressure an temperatureremain constant its ,olume will hal,e.#. #oyle3s 4aw applies to conitions of constant temperature ,olume an pressure.C. +olecules of any ieal gas ha,e the same ,elocity at the same temperature regarless of the

ientity of the gas.'. *he ,olume of an ieal gas will rop -y approximately (1526) of its ,alue if its temperature

rops -y 1 7C .E. 8tanar temperature an pressure is 1 atm an 2$ 7C.

9. ! -unch of -ore cra:y college stuents hi&e to the top of +t. Hoo where they -lew up a-alloon an calculate its ,olume to -e ".";" m. *hey note the temperature to -e


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'. Des it is within the safe range -ut on the low sie.E. *here is not enough information to answer the uestion.

%. ! mixture of gases has a total pressure of 12"" *orr. *he mixture is analy:e an foun tocontain %." mol CF2 9." mol CF an 2." mol !r. What is the partial pressure of !r

!. 12"" torr#. 2"" torrC. 62"" torr'. 29"" torrE. %"" torr

6. 1."" mole of HCl(l

) is reacte with an excess of +g(s). What ,olume of hyrogen gas willresult if the reaction is conucte at 8*P

!. 22.9 4#. 99.; 4C. 26 4'. 11.2 4E. ".";2 4

;. /sing the graph -elow etermine the gas that has the lowest ensity at 8*P.


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!) !#) #C) C

') 'E) !ll of the gases ha,e the same ensity at 8*P.

G. Which of the following gas samples woul -e most li&ely to -eha,e ieally uner the stateconitions

!) Be at 8*P#) CF at 2"" atm an 2$7CC) 8F2at 2 atm an " K') B2at 1 atm an @6"7C

E) F2at 9"" atm an 2$7C

12. Place the following compouns in orer of ecreasing strength of intermolecular forces.

H F2 CF2

!) H I CF2 I F2#) H I F2 I CF2C) F2 I CF2 I H') CF2 I H I F2

E) CF2 I F2 I H

1. 0n liui propanol CHCH2CH2FH which intermolecular forces are present

!) 'ispersion hyrogen -oning an ipole@ipole forces are present.#) Fnly ipole@ipole an ion@ipole forces are present.C) Fnly ispersion an ipole@ipole forces are present.


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') Fnly hyrogen -oning forces are present.E) Fnly ispersion forces are present.

16. !ssign the appropriate la-els to the phase iagram shown -elow.

!) ! A liui # A soli C A gas ' A critical point


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#) ! A gas # A soli C A liui ' A triple pointC) ! A gas # A liui C A soli ' A critical point') ! A soli # A gas C A liui ' A supercritical fluiE) ! A liui # A gas C A soli ' A triple point

1;. Consier the phase iagram -elow. 0f the ashe line at 1 atm of pressure is followe from1"" to $""7C what phase changes will occur (in orer of increasing temperature)

!) conensation followe -y ,apori:ation#) su-limation followe -y epositionC) ,apori:ation followe -y eposition') fusion followe -y ,apori:ationE) Bo phase change will occur uner the conitions specifie.

1G. What precipitate is most li&ely forme from a solution containing #a2J BaJ FH@ an CF2@.

!) BaFH#) #aCFC) Ba2CF') #a(FH)2E) Bo precipitate will form.

2". i,e the net ionic euation for the reaction (if any) that occurs when aueous solutions of

!l(C2HF2)an 4iBFare mixe.

!) !lJ(a) J BF@(a) L !l(BF)(s)

#) 4iJ(a) J C2HF2@(a)L 4iC2HF2(s)

C) !lJ(a) J BF@(a) J 4iJ(a) J C2HF2@(a) L !l(BF)(a) J 4iC2HF2(s)

') 4iJ(a) J (C2HF2)@(a) L 4i(C2HF2) (s)E) Bo reaction occurs.


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21. Which of the following solutions will ha,e the highest concentration of chlorie ions

!) ".1" + BaCl#) ".1" + +gCl2C) ".1" + !lCl') "."$ + CaCl2E) !ll of these solutions ha,e the same concentration of chlorie ions.

2. Commercial grae HCl solutions are typically G."M (-y mass) HCl in water. 'etermine themolarity of the HCl if the solution has a ensity of 1.2" g5m4.

!) 6.6G +#) 1".6 +C) 12.; +') G.$ +E) 1.G +29. Choose the statement -elow that is */E.

!) ! solution will form -etween two su-stances if the solute@sol,ent interactions are ofcompara-le strength to the solute@solute an sol,ent@sol,ent interactions.#) ! solution will form -etween two su-stances if the solute@sol,ent interactions are smallenough to -e o,ercome -y the solute@solute an sol,ent@sol,ent interactions.

C) ! solution will form -etween two su-stances if the solute@solute interactions are strongenough to o,ercome the sol,ent@sol,ent interactions.') ! solution will form -etween two su-stances only if the sol,ent@sol,ent interactions are wea&enough to o,ercome the solute@sol,ent interactions.E) Bone of the a-o,e are true.

2$. What mass (in g) of BHmust -e issol,e in 96$ g of methanol to ma&e a ".2$" msolution

!) 2."2 g

#) 9.G9 gC) 1.1G g') ;.92 gE) 1.G" g


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2;. Calculate the -oiling point of a solution of $""." g of ethylene glycol (C2H%F2) issol,ein $""." g of water. KfA 1.;%7C5m an K-A ".$127C5m. /se 1""7C as the -oiling point ofwater.

!) 1"7C#) G27CC) 1";7C') 6"7CE) ;.7C

2G. 0entify the solute with the lowest ,anNt Hoff factor.

!) nonelectrolyte#) BaCl

C) +g8F9') +gCl2E) eCl

". ! 1$"." m4 sample of an aueous solution at 2$7C contains 1$.2 mg of an un&nownnonelectrolyte compoun. 0f the solution has an osmotic pressure of ;.99 torr what is the molarmass of the un&nown compoun

!) 22 g5mol#) 2G9 g5molC) 91 g5mol') 99; g5molE) 1G$ g5mol

1. *he cu-ic form for the fictitious element Fregonium is CC. *he atomic raius is12." pm an the ensity is 9.2 g5cm. *he molar mass of Fregonium isO

(!) 2%6.9 g5mol(#) 1%6.9 g5mol(C) %6.9 g5mol(') 9%6.9 g5mol

(E) %6.9 g5mol

1 m A 1 x 1"12pm1 m A 1"" cm

or 8imple Cu-icO lA 2ror #CCO lA 9r5or CCO lA 9r52


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9.Consier a fixe amount of gas. Which of the following is !48E

(a) When the ,olume is increase at constant temperature the pressure increases.

(-) When the temperature is increase at constant ,olume the pressure increases.

(c) When the temperature is ecrease at constant pressure the ,olume ecreases.

() When the pressure is increase at constant temperature the ,olume ecreases.

$.! stuent places "."$" mol of CF an "."2$ mol of CF2into a 1." liter -alloon at 2" C.

(a) *he partial pressure of the CF is 4E88 *H!B the partial pressure of CF2.

(-) *he partial pressure of the CF is *HE 8!+E !8 the partial pressure of CF2.

(c) *he partial pressure of the CF is E!*E *H!B the partial pressure of CF2.

() *he mole fraction of CF is 4E88 *H!B the mole fraction the mole fraction of CF2.

6.Consier the following fi,e gasesO F2(g) #r2(g) C2H%(g) H2(g) CF (g)

Ff these the gas molecule with the greatest ,elocity at room temperature isO

(a) F2(g).

(-) #r 2(g).

(c) C2H%(g).

() H2(g).


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(e) CF (g).

;.! stuent places .;; g of a no-le gas into a 2.""@4 container at 2G K an measures the pressure to -e1."2 atm. *his no-le gas isO

(!) He.(#) Be.(C) !r.(') Kr.(E) Qe.

G.! stuent o-tains a glass -ottle at 29.1 =C an ".G;G atm. *he stuent closes the -ottle containingair R6;M B2(g) 21M F2(g) 1M other gasesS. *he stuent places the -ottle o,er a #unsen -urner so the-ottle an the air heat up to ".$ =C. Which of the following is true

(!) *he gases insie the -ottle are tra,eling faster at the higher temperature than at the lowertemperature the pressure insie the -ottle is higher at the higher temperature than at the lowertemperature the num-er of moles of gas present insie the -ottle is higher at the highertemperature than at the lower temperature.

(#)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is higher at the higher temperature than atthe lower temperature the num-er of moles of gas present insie the -ottle is higher at the highertemperature than at the lower temperature.

(C)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is the same at the higher temperature thanat the lower temperature the num-er of moles of gas present insie the -ottle is the same at thehigher temperature than at the lower temperature.

(') *he gases insie the -ottle are tra,eling faster at the higher temperature than atthe lower temperature the pressure insie the -ottle is higher at the higher temperature than at thelower temperature the num-er of moles of gas present insie the -ottle is the same at the highertemperature than at the lower temperature.

(E)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is lower at the higher temperature than atthe lower temperature the num-er of moles of gas present insie the -ottle is the same at thehigher temperature than at the lower temperature.

9".*he root@mean@suare spee of !r (g) at 1."6 atm an "1.9 K isO

(!) 99 m5s.(#) 691 m5s.(C) $19 m5s.(') 6.2G% x 1"@%m5s.


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(E) 122" m5s.

91.8hown -elow is the -alance euation for the com-ustion of -utane (molar mass A $;.12 g5mol).What is the ,olume (liters) of CF2(g) prouce at 1.$"" atm an 2G;." K from the com-ustion of 11%.29 gof -utane in excess F2(g)

2 C9H1"(g) J 1 F2(g) ; CF2(g) J 1" H2F (g)

(!) 12$.$ 4 CF2(#) 2;."; 4 CF2(C) 112. 4 CF2(') 229." 4 CF2(E) 1".$ 4 CF2

9. Consier imethyl ether CHFCH. *he intermolecular forces present inCHFCHareO

(!) 'ispersion forces only.(#) 'ipole@ipole forces only.(C) 'ispersion forces an ipole@ipole forces.(') 'ispersion forces ipole@ipole forces an hyrogen -oning.(E) Hyrogen -oning only.

9$. Which of the following has a hyrophilic en (polar water@lo,ing en)an a hyropho-ic en (non@polar water@fearing en) an has the a-ility to -rige watermolecules to non@polar molecules

(!) CC /nit Cell(#) raphite(C) Ethane CHCH(') 8oap


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(E) He

9%. *he eui,alent num-er of atoms in the CC unit cell isO

(!) 1(#) 2(C) (') 9

(E) %

96. *he structure -elow representsO

(!) !n 8C unit cell(#) ! #CC unit cell(C) ! CC unit cell(') ! cell phone(E) ! pro&aryotic cell

9;. *he free:ing point of ".$"" m aueous !lClisO

(!) @2.6G C(#) J2.6G C(C) J$.$; C(') @$.$; C(E) @.62 C

9G. Which of the following sets of compouns are expecte to -e solu-le in water

(!) CH9 CF2 C9(#) BaCl CH9 CHFCH(C) BaCl CHCH2FH BH(') BaCl CCl9 C9H1"


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$". ! stuent issol,es 12.""" g of an un&nown polymer in ;"" m4 of water at 2" K.8he measures the osmotic pressure to -e "."%66 mm Hg. What is the molar mass of thepolymer

(!) 2.61 x 1"%g5mol

(#) 9.92 x 1"%

g5mol(C) 1.6 x 1"$g5mol(') 1.6 x 1"%g5mol(E) 2.2% x 1"%g5mol

KED F44FW8O

1. Which is the higher pressure

!. 2""" torr#. 2.$ atmC. 265 kPa

'. 2 1"mm HgE. *he pressure on the top of +t. E,erest.

2. Which of the following statements a-out gases is */E

!. 0f the amount of a sample of an ieal gas is ou-le while the pressure an temperatureremain constant its ,olume will hal,e.

#. #oyle3s 4aw applies to conitions of constant temperature ,olume an pressure.C. +olecules of any ieal gas ha,e the same ,elocity at the same temperature regarless of the

ientity of the gas.D. The volume of an ideal gas will drop by approximately !"2#$% of its value if its

temperature drops by ! &C .

E. 8tanar temperature an pressure is 1 atm an 2$ 7C.

9. ! -unch of -ore cra:y college stuents hi&e to the top of +t. Hoo where they -lew up a-alloon an calculate its ,olume to -e ".";" m. *hey note the temperature to -e


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C. '.'(' m$

'. ".11 m

E. ".1% m

$. >Halothane? is a common anesthetic inhalant use for surgical purposes. *he partial pressure

of halothane in the lungs must -e maintaine within a critical range of 9." torr @ ;." torr forsuccessful anestheti:ation. *he halothane mol fraction A "."1" in the lungs of a certain patient.0s this within the target range (!ssume operating room pressure to -e 6%" torr.)

!. Bo the mol fraction is too low patient may wa&e.#. Bo the mol fraction is too high patient respiration is angerously low.C. )es* it is within the safe range* but on the high side.

'. Des it is within the safe range -ut on the low sie.E. *here is not enough information to answer the uestion.

%. ! mixture of gases has a total pressure of 12"" *orr. *he mixture is analy:e an foun to

contain %." mol CF2 9." mol CF an 2." mol !r. What is the partial pressure of !r!. 12"" torr+. 2'' torr

C. 62"" torr'. 29"" torrE. %"" torr

6. 1."" mole of HCl(l) is reacte with an excess of +g(s). What ,olume of hyrogen gas willresult if the reaction is conucte at 8*P

,. 22.-

#. 99.; 4C. 26 4'. 11.2 4E. ".";2 4


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;. /sing the graph -elow etermine the gas that has the lowest ensity at 8*P.

,% ,

#) #C) C') 'E) !ll of the gases ha,e the same ensity at 8*P.

G. Which of the following gas samples woul -e most li&ely to -eha,e ieally uner the state

conitions

,% /e at 0TP

#) CF at 2"" atm an 2$7CC) 8F2at 2 atm an " K') B2at 1 atm an @6"7CE) F2at 9"" atm an 2$7C

12. Place the following compouns in orer of de1reasingstrength of intermolecular forces.

H F2 CF2

,% 3 4 C2 4 2

#) H I F2 I CF2C) F2 I CF2 I H') CF2 I H I F2E) CF2 I F2 I H


15/23

1. 0n liui propanol CHCH2CH2FH which intermolecular forces are present

,% Dispersion* hydrogen bonding and dipoledipole for1es are present.

#) Fnly ipole@ipole an ion@ipole forces are present.C) Fnly ispersion an ipole@ipole forces are present.

') Fnly hyrogen -oning forces are present.E) Fnly ispersion forces are present.

16. !ssign the appropriate la-els to the phase iagram shown -elow.


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!) ! A liui # A soli C A gas ' A critical point+% , 7 gas* + 7 solid* C 7 li8uid* D 7 triple point

C) ! A gas # A liui C A soli ' A critical point') ! A soli # A gas C A liui ' A supercritical fluiE) ! A liui # A gas C A soli ' A triple point

1;. Consier the phase iagram -elow. 0f the ashe line at 1 atm of pressure is followe from1"" to $""7C what phase changes will occur (in orer of increasing temperature)

!) conensation followe -y ,apori:ation#) su-limation followe -y epositionC) ,apori:ation followe -y epositionD% fusion* followed by vapori9ation

E) Bo phase change will occur uner the conitions specifie.

1G. What precipitate is most li&ely forme from a solution containing #a2J BaJ FH@ an CF2@.


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!) BaFH+% +aC$

C) Ba2CF') #a(FH)2E) Bo precipitate will form.

2". i,e the net ioni1 e8uationfor the reaction (if any) that occurs when aueous solutions of!l(C2HF2)an 4iBFare mixe.

!) !lJ(a) J BF@(a) L !l(BF)(s)

#) 4iJ(a) J C2HF2@(a)L 4iC2HF2(s)

C) !lJ(a) J BF@(a) J 4iJ(a) J C2HF2@(a) L !l(BF)(a) J 4iC2HF2(s)

') 4iJ(a) J (C2HF2)@(a) L 4i(C2HF2) (s):% /o rea1tion o11urs.

21. Which of the following solutions will ha,e the highest concentration of chlorie ions

!) ".1" + BaCl#) ".1" + +gCl2C% '.!' ; ,lCl$

') "."$ + CaCl2E) !ll of these solutions ha,e the same concentration of chlorie ions.

2. Commercial grae HCl solutions are typically G."M (-y mass) HCl in water. 'etermine themolarity of the HCl if the solution has a ensity of 1.2" g5m4.

!) 6.6G +#) 1".6 +C% !2.( ;

') G.$ +E) 1.G +2-. Choose the statement -elow that is T


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enough to o,ercome the solute@sol,ent interactions.E) Bone of the a-o,e are true.

2$. What mass (in g) of BHmust -e issol,e in 96$ g of methanol to ma&e a ".2$" m

solution

,% 2.'2 g

#) 9.G9 gC) 1.1G g') ;.92 gE) 1.G" g

2;. Calculate the -oiling point of a solution of $""." g of ethylene glycol (C2H%F2) issol,ein $""." g of water. KfA 1.;%7C5m an K-A ".$127C5m. /se 1""7C as the -oiling point ofwater.

!) 1"7C#) G27CC% !'(&C

') 6"7CE) ;.7C

2>. 0entify the solute with the lowest ,anNt Hoff factor.

,% nonele1trolyte

#) BaClC) +g8F9') +gCl2E) eCl

$'. ! 1$"." m4 sample of an aueous solution at 2$7C contains 1$.2 mg of an un&nownnonelectrolyte compoun. 0f the solution has an osmotic pressure of ;.99 torr what is the molarmass of the un&nown compoun

,% 22$ g"mol

#) 2G9 g5molC) 91 g5mol') 99; g5molE) 1G$ g5mol


19/23

1. *he cu-ic form for the fictitious element Fregonium is CC. *he atomic raius is12." pm an the ensity is 9.2 g5cm. *he molar mass of Fregonium isO

,% 26#.- g"mol

(#) 1%6.9 g5mol(C) %6.9 g5mol(') 9%6.9 g5mol(E) %6.9 g5mol

1 m A 1 x 1"12pm1 m A 1"" cm

or 8imple Cu-icO lA 2ror #CCO lA 9r5or CCO lA 9r52

9.Consier a fixe amount of gas. Which of the following is 3,0:

a% ?hen the volume is in1reased at 1onstant temperature* the pressure in1reases.

(-) When the temperature is increase at constant ,olume the pressure increases.

(c) When the temperature is ecrease at constant pressure the ,olume ecreases.

() When the pressure is increase at constant temperature the ,olume ecreases.

$.! stuent places "."$" mol of CF an "."2$ mol of CF2into a 1." liter -alloon at 2" C.

(a) *he partial pressure of the CF is :00 T,/the partial pressure of CF2.

(-) *he partial pressure of the CF is T: 0,;: ,0the partial pressure of CF2.

1% The partial pressure of the C is @


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() *he mole fraction of CF is :00 T,/the mole fraction the mole fraction of CF2.

6.Consier the following fi,e gasesO F2(g) #r2(g) C2H%(g) H2(g) CF (g)

Ff these the gas molecule with the greatest ,elocity at room temperature isO

(a) F2(g).

(-) #r 2(g).

(c) C2H%(g).

d% 2g%.

(e) CF (g).

;.! stuent places .;; g of a no-le gas into a 2.""@4 container at 2G K an measures the pressure to -e1."2 atm. *his no-le gas isO

(!) He.(#) Be.C% ,r.

(') Kr.(E) Qe.

G.! stuent o-tains a glass -ottle at 29.1 =C an ".G;G atm. *he stuent closes the -ottle containingair R6;M B2(g) 21M F2(g) 1M other gasesS. *he stuent places the -ottle o,er a #unsen -urner so the

-ottle an the air heat up to ".$ =C. Which of the following is true

(#) *he gases insie the -ottle are tra,eling faster at the higher temperature than at the lowertemperature the pressure insie the -ottle is higher at the higher temperature than at the lowertemperature the num-er of moles of gas present insie the -ottle is higher at the highertemperature than at the lower temperature.

(#)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is higher at the higher temperature than atthe lower temperature the num-er of moles of gas present insie the -ottle is higher at the highertemperature than at the lower temperature.

(C)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is the same at the higher temperature thanat the lower temperature the num-er of moles of gas present insie the -ottle is the same at thehigher temperature than at the lower temperature.


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D% The gases inside the bottle are traveling faster at the higher temperature

than at the lower temperatureA the pressure inside the bottle is higher at the higher

temperature than at the lower temperatureA the number of moles of gas present inside the

bottle is the same at the higher temperature than at the lower temperature.

(E)*he gases insie the -ottle are tra,eling the same ,elocity at the higher temperature thanat the lower temperature the pressure insie the -ottle is lower at the higher temperature than atthe lower temperature the num-er of moles of gas present insie the -ottle is the same at thehigher temperature than at the lower temperature.

9".*he root@mean@suare spee of !r (g) at 1."6 atm an "1.9 K isO

,% -$- m"s.

(#) 691 m5s.(C) $19 m5s.(') 6.2G% x 1"@%m5s.(E) 122" m5s.

91.8hown -elow is the -alance euation for the com-ustion of -utane (molar mass A $;.12 g5mol).What is the ,olume (liters) of CF2(g) prouce at 1.$"" atm an 2G;." K from the com-ustion of 11%.29 gof -utane in excess F2(g)

2 C9H1"(g) J 1 F2(g) ; CF2(g) J 1" H2F (g)

(!) 12$.$ 4 CF2(#) 2;."; 4 CF2(C) 112. 4 CF2(') 229." 4 CF2:% !$'.5 C2

9. Consier imethyl ether CHFCH. *he intermolecular forces present inCHFCHareO


22/23

(!) 'ispersion forces only.(#) 'ipole@ipole forces only.C% Dispersion for1es and dipoledipole for1es.

(') 'ispersion forces ipole@ipole forces an hyrogen -oning.(E) Hyrogen -oning only.

9$. Which of the following has a hyrophilic en (polar water@lo,ing en)an a hyropho-ic en (non@polar water@fearing en) an has the a-ility to -rige watermolecules to non@polar molecules

(!) CC /nit Cell(#) raphite(C) Ethane CHCHD% 0oap

(E) He

9%. *he eui,alent num-er of atoms in the CC unit cell isO

(!) 1(#) 2(C) D% -

(E) %

96. *he structure -elow representsO

(!) !n 8C unit cell(#) ! #CC unit cellC% , 3CC unit 1ell

(') ! cell phone(E) ! pro&aryotic cell

9;. *he free:ing point of ".$"" m aueous !lClisO

(!) @2.6G C


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(#) J2.6G C(C) J$.$; C(') @$.$; C:% $.#2 C

9G. Which of the following sets of compouns are expecte to -e solu-le in water

(!) CH9 CF2 C9(#) BaCl CH9 CHFCHC% /aCl* C$C2* /$(') BaCl CCl9 C9H1"

$". ! stuent issol,es 12.""" g of an un&nown polymer in ;"" m4 of water at 2" K.8he measures the osmotic pressure to -e "."%66 mm Hg. What is the molar mass of thepolymer

(!) 2.61 x 1"%g5mol+% -.-2 x !'6g"mol

(C) 1.6 x 1"$g5mol(') 1.6 x 1"%g5mol(E) 2.2% x 1"%g5mol

CH 222 Exam 2 Practice Combined

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