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Midterm Exam with Answer Key - Chemistry 1 - Introduction |, Exams of Chemistry

Material Type: Exam; Class: Chemistry 1 - Introduction; Subject: Chemistry; University: College of Alameda;

Typology: Exams

2011/2012

Uploaded on 05/31/2012

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Midterm Ghemla Spring 2012
Please look for constants and tables in the appendix.
1.) Write the answer with the conect number of significant figures.
3.021005 / 92.3
0.000349100 - 0.14590
c. 98832.51 x 0.00345 - 10.39902 33t
2.) A25 mL graduated cylinder has 10 divisions between 20 and 21 mL markings. A 100 mL
graduated cylinder has 10 divisions between the 20 and 30 mL markings. What are the
measured densities to the correct number of significant figures if you find that 1.0783 grams
of an unknown liquid fills each graduated cylinder to exactly the 20 mL mark?
a. 25 mL graduated cylinder measured density A0'O^L
$
-!t
bY 100 mL graduated cytinder measured O"X'b" /4 L
nP**sure "f 31: --
is - lVtl torS
Thr- {'},-be is f ll#d illrtt ritdfa*r1'
T*.5
LI
+55 Tor( + 5t 5Torr
Forrar\ich of the following reactions is AH1 of the product equal to AH,g661;6n ?
t a./ 2Cls,eraptrite) +2Hz@ - CzHc(s)
\i NzGl + oz(s) - 2No1sy .- Y
c. 2Hztgt+ Oz(s)- 2H2Og9 .U^
d. 2Hzrct+ Oz(s) * 2H2Og .'l'
e. COtnl * T.OzO - COz(s) .%
*Vr= fl,5 cr.\ = 5t5 ^^ UV6
4.)
ffinr
4A
lJ
x/4n
$+
3.) What is the pressure of the gas in the round bulb if the atmospheric pressure is 758 Torr?
a.
b.
C, o37T
' O , tq555 q,{
A =0P531 Tl^t
[ = o,054 1/^V
3 l' 0 nttn
**rz "
Mb /w
pf3
pf4
pf5

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Download Midterm Exam with Answer Key - Chemistry 1 - Introduction | and more Exams Chemistry in PDF only on Docsity!

Midterm Ghemla Spring 2012

Please look for constants and tables in the appendix.

1.) Write the answer with the conect number of significant figures.

0.000349100 (^) - 0.

c. 98832.51 x 0.00345 (^) - 10.39902^ 33t

2.) A25 mL graduated cylinder has 10 divisions between 20 and 21 mL markings. A 100 mL

graduated cylinder has 10 divisions between the 20 and 30 mL markings. What are the

measured densities to the correct number of significant figures^ if^ you find that 1.0783 grams

of an unknown liquid fills each graduated cylinder to exactly the 20 mL mark?

a. 25 mL graduated^ cylinder measured density A0'O^L

$

-!t bY 100 mL graduated cytinder measured O"X'b"

/4 L

n

P**sure "f

31: (^) --

is (^) - lVtl^

torS

Thr- {'},-be^ is^ f^ ll#d^

illrtt ritdfa*r1'

T*.

L

+55 Tor(^ +^ 5t^ I

5Torr

Forrar\ich (^) of the following reactions is AH1 of the product equal to AH,g661;6n? t a./^ 2Cls,eraptrite)^ +2Hz@^ - CzHc(s) \i NzGl +^ oz(s) (^) - 2No1sy .- Y c. 2Hztgt+ Oz(s)- 2H2Og9 .U^ d. 2Hzrct+ Oz(s) * 2H2Og .'l' e. COtnl *^ T.OzO (^) - COz(s) .%

*Vr=

fl,5 cr.^ =^

5t ^^

UV

ffinr

4A

lJ

x/

4n

3.) What is the pressure of the gas in the round bulb if the atmospheric pressure is 758 Torr?

a.

b.

C, o37T

' (^) O , tq

q,{

A =0P

Tl^t

[ (^) = o,054^ 1/^V

3 l'^0 nttn

**rz (^) "

Mb

/w

5.) You are asked to^ make a solution of barium^ nitrate'

a.WhatmassofBa(Noa)zisneededtomake0.500Lofa0.250M

(o *l)(P, ato^ m^ )^ =^

s' 1v{ uo&a'e(

(o'iin"*|1#y:,:^p1atm

wtiEfii the final molarity of barium

te the species is ionic or molecular.

a. CrzOg

b. Ammonium sulfate

c. Tin^ (ll)^ bromide

d. NzO

e. SrS

f. Sodium bicarbonate

g. CHr

h. co

i. HgF

Would the atmosphere^ behave more like^ an^ ideal gas on^ the^ surface^ of^ Venus,^ Earth,^ p-Sor

the follow'rnsi;:i"l"J;ihe

surface atmospheric pressuref(wnusigsr,^ Earth^1 o".k/^ e

8.) Would the atmosphere^ behave more like^ an^ ideal gas on^ the^ surface^ of^ Venus,^ Earlh,

ions? o,Joo H^ Ndt

o. ato^ t4^ Ao--'o c. How would^ you^ make 2.0000^ L^ of 0.0015Q M^ Ba(NO3)2^ from^ the^ stock solution of 0-^

M

Ba(NOa)z? E*pf"in^ what^ steps you would take and what amounts you^ would^ use'

[n,*tirq11,t(1.cooo.L)

= '(^

( D"asoM^ ) /=^ 0'ot^ a^

L

lt4atana lQ,^ o^^ L^ ,/,^ 11,2^ 0,^ as^

M safxh^ o"'"^ I^

  • JJ^^ "

-rD (^) E,ooooiirt"0+f .-t&,^ AIJ^

uoa&r tD^ #tt^

+o I

a4".ilr^ &,otooL, What is the tdal number of-atoms in^ 0.250^ grams of^ glucose,^ C6H12O6?^ ,r^ e n ll : '- I^ 'o&-^ ur (^) ^^** /^ (^) ' rl})x 'o"

ilckc"'l{lo

e

J., n'r|,oro^ .t"txt o*r^ lz ai (^) - ,'0fr^ t frl (^) - ko^d b"fCJz

{

q

oleculqr

0.006 bar)? (^
b. Based on only^ the^ average surface^ temperature@t*+arth7-2'C,^ Mars^

-55'C)

i

I

lution qf^ Ba(NO3)2?

No3 (^) ).

6-"-T)""tecutar.

|.-< ( (^) ionidimolecular.

d@'o,""u,u.

_-___z "ffi"O

fio,Dlnorecutar'

N,. l-l/o=

(

'''

i

iI I i

12.)When 68.00 J of^ energy^ are added^ to^ a sample^ ol^ galllum^ Inat^ ls lnmally^ ar^ zc.u^

-v'

temperature rises to^ g8.0^ "C. The^ specific^ heat of gallium is 0.372 J/g "C, and^ the density^ is^ 5'

g/cm3. What is the volume^ of^ the gallium^ samole?

ATf

';;0.-

d5'o't r=, F,'"^1 (^) - LR.,,y^T 6

13.)Forthefollowingreactions,writetheproductswittrstffieeaffii6taoelthetypeof

reaction it is, and^ write the net^ ionic^ reaction^ if it^ is^ a^ precipitation, acid^ base,^ or oxidatlon

reduction reaction.^ lf^ there is no reaction,^ write NR.^ The^ appendix has solubility and activity

tables.

a.'lc"1oH1^"o,* QH3Poal"ov* (^) 6AzOLtl

Qr€

c:g,ho-+io^

i ac'lba'>P-

  • (^) O"utPon)a (s)

; )

nfutrr) +^ aN^

uA b. BaCl216q1+ c^6)

{

€cigiLlr a^

c. (^) J Agruoq"o, *

Na25O41"o1+

]oq'r^6,

Altsl -+

a:* + (n3)

-+ (^) B^So? (^) cr)

O X;^ J..do|i.^ -^ r€d^ " cf'^

a'...

l?, 1#;':"r,#fo1-i

At,,)

4 At'[^6,*

3A3rs)

MW C^try)^ zla.)ff^ you^ combine 5.00d-motes of Ca(oH)

with 5.000 moles^ of^ HsPoq as^ in^ part a^ above,^ 1\r!

W)^CI ilji.n:"Tffi.^ =^

t, bb?^ *,{toc^,(pq)^ *ouft^

^*E 5,ffiD (^) a ^u&tG(ru). "^ ;mi;z

-' t'bb^ r'*txza^ -o(3-1)L^4

6,r,,0 ,ru(u^ vls,1gq^ x t^ "^r(nctl.^ = ?,fto^

*/^

CfOr),

cAll "'k

ffiH1oq b. How much excess reactant^ is^ left?

5,w *,,u a^

(*i",, )^

;W*r.= 3'3 3

g

^o(u

=

Po'''* )'

4l (No3)r,^J^

3 A3cst

3

Q, 3t ewr!

S ooo

l

*,'U A=?0,

15.)For the following reaction, name the two elements that are oxidized and reduced, and write the oxidation numbers before and after the reaction.

,1r"ol* 3 H,;1* (^) Kzsoa .li,^ ;i. o1 +^ $"o^ #

O (^) is oxidized from -J ,o O 6q 14'n (^) is reduced tro^ # 7 to 4 L

16.)lf 10.532 grams^ of^ Fe2O3^ is reacted^ with^ according to^ the eguation^ below, how many liters^ of^ H

l4d

Eu 0,^ ff:i["j""ded

to completely react at 25.10"c and 760.00^ Torr? (Remember^ to balance the

ZIW:t\lr,0q

I (^) Fe2o31"v* i "'n'-

gFe(')+ -9-"o*'

lD,53t;- (^) ffi= ^

o'otbfrTsnhE'o'qY' 6

o,obn'^&,x uffi#fo=^ o,tli+s:i:*'{^ ., it

flu=nRf (^) {=-%,n":ts-?

'Y,g+ea+7v

17.)Explain the differences between t'C,toc,^ and12C'

fa. ,protona

brn*k#

G"At{':*a

@

t\C b grotv,a^

3 ^eVa

b "-lntY* WU tac'+ 6 ,ro+""a^ 0'^n*Vrm'a^

4 'A"k

,7,

18.)Given the following three reactions with AH below, find the AH for the reaction

cszo+ 6 Hzoztrt (^) - Cozlny+ 6 Hzolry+^2 So21sy m=^ - lbb{^ xt

CSz (^) lrl + 3 Oztsl (^) - COz (^) 1s1 +^ 2SO2 (^) 1gy

Hz (^) (s) +^ Oz (^) (g) (^) - HzOz (^) frl

Hz(s)+YrOzGl*HzO1;)

AH" = -1077 KJ

AH" = -188 KJ

AH" = -286 KJ

,'

4,

CS,

  • (^) b, ->^ Co.^
  • (^) aS%

b*.oz

bA,

  • (^30) z -+^ 614.o
  • t0++

a (wr)

bGTrb)

  • lb6,^ Kt