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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.
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^
-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-
; )
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*.oz
bA,
a (wr)
bGTrb)
