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Chem 112 Exam 1 Version A
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t. The pressure^ of^ a^ certain^ gas is^ measured^ to units of pascals?^ (1^ atm=1.01325^ x a) 2.963^ x^ 10-s^ Pa b) 2.565^ x^ !O7^ Pa c) 3.043 x^ LOs Pa
The volume of a gas^ sample varies directly with the^ absolute^ temperature.
The volume of a gas^ varies^ proportionally with the^ pressure.
All gas^ samples of the^ same^ volume^ at^ STP^ contain the^ same^ number^ of^ molecules.
All gas^ samples of the^ same^ volume at^ STP^ contain the^ same^ number of^ atoms.
- (^) A27 .O-Lsample of nitrogen at 7.85 atm and 27"C^ is^ simultaneously^ expanded^ to^ 63.4^ L^ and
a)
q
d)
e)
- What^ is^ the^ pressure^ of^ a^ 23.2-L gas^ sample^ containing 4.76^ mol^ of^ gas^ at^ 42.0"C?^ (R =^ 0.0821"^ L . (^) atm/(K.^ mol), l- atm (^) = 760 mmHg)
l-
(>
c'-
heated to 35'C. What is the new pressure^ of^ the^ gas? a) 4.33 atm b) 168 atm^
{ (^) 1: '1-l :l
@
;;',;; (^) P, --^ I t?.J-. -i, -_^ >1"L; 3 cc"(-
How many moles^ of^ gas^ are in^ a gas^ sample^ occupying^ 1,.17^ L^ aL623 mmHg and^298 K?
a) 3.70 mol (^) a, / d)^ l-6.e^ mol^ ; = [,'" 7n) ( (^) t']?l fbt1 0.0593^ mot^ fr^ -*^ .I:--^ e)^ 45.1mol^ A- '-^
/'1 (^) - ----*
Tf ;.;;;;;;"r
r<-f t, --'r i^
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: (^) l-::z^yr-su Calculate the root-mean-square uelocity for the 02 molecules in^ a^ sample of^ 02 gas^ atfl.S"C.
Spring 2011
10:00am/Odago, M.^ O.
be 253.1 mmHg. What is this pressure expressed^ in
s Pa and
d)
@
760mmHg = 1 atm)
3.287 x^ 10-6 Pa
3.374 x^104 pa
d) 6.98 x e) L.43 x -+16 X 6.01a,_=--- x3i
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d) condensation
e) vaporization
l.o atm^ =
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1 bo^ *t"rtl
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? '3'!t
- Whichof the following^ is a^ correct^ statement of^ Charles's^ l^*,^ L^ : p' T
The pressure of a gas^ sample varies inversely^ with^ the volume.
(_,
5.31 mmHg rt /) _
5.38 x^ L02 mmHg f'v
^ {<^ I
4.O3x103mmHg A nQl
r*_1-
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10-3 mmHg
102 mmHg
. (^) 5.'JO6ofwr
a) b)
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(R (^) = 8.3145 J/Kmol) (^) r--:--- a) !32.4m/s (^) -r1- .=,l^ '+t
d) 277.1-m/s b) 15.18^ m/s^ ^ w\ e)^ 9.140^ x^ 1,026^ m/s
what is the name for the following^ pr'.r"^ .h.)n?Jih?;^ iffp;"t^ when lr(/)^ )^ lz(s)?
a) b) TN
melting
sublimation
freezing
13. Below^ is^ a phase^ diagram,for^ a^ substance.
t is the^ name^ for^ point^ Z^ on^ the^ diagram?
normal boiling Point.
boiling point.
melting point.
criticalpoint.
triple point.
Why does hydrogen^ fluoride^ has^ an^ unusually^ high^ normal boiling^ point^ compared^ to the other
hydrogen halides?
a) The H-F bond in hydrogen^ fluoride^ is^ very strong. -bn Hydrogen^ fluoride^ is^ capable^ of^ forming^ hydrogen^ bonds' "i)' (^) Hydrogen fluoride has very strong London dispersion forces' d) Hydrogen fluoride^ is^ ionic. e) Hydrogen fluoride^ is^ covalent.
When a water molecule forms a^ hydrogen bond^ with^ another^ water^ molecule, which atoms^ are
involved in the interaction?
a) A hydrogen from^ one molecule^ and^ a^ hydrogen^ from^ the^ other^ molecule. fl6-l A^ hydrogen^ from^ one molecule^ and an oxygen^ from^ the^ other^ molecule, T An^ oxygen^ from^ one molecule^ and an oxygen^ from the other^ molecule. d) Two hydrogens^ from^ one molecule^ and one oxygen^ from the other^ molecule. e) Two^ hydrogens^ from^ one molecule^ and^ one hydrogen^ from the other^ molecule.
Wha
a) b) c) rdil e)
L4,
b
p,
16. Which of^ the following^ is^ an^ ionic^ solid?
a) Na(s)
til csF(s)
c) Co2(s)
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Which one of the following^ statements about^ solid^ Cu^ (face-centered cubic^ unit^ cell)^ is
incorrect?
a) lt will conduct electricity. iEX There^ are^ two^ atoms per^ unit^ cell. "O The number of atoms surrounding^ each^ Cu^ atom^ is 12. d) The^ solid^ has a^ cubic closest-packed^ structure. e) The length of a face diagonal is^ four^ times^ the^ Cu^ radius. The metal palladium^ crystallizes in^ a^ face-centered cubic lattice^ with^ an edge^ length of 388' pm. (^) What is the density of palladium? a) 6.01glcm b) o.752 g/cm c) 3.01glcm
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?€., (^) = l.rlrs^;}', , t=q;H:.1;t:r"-* The metal cesium crystallizes in^ a^ body-centered^ cubic^ lattice.^ lf thd density of^ cesium^ is^ 1.88^ --J{" g/r^t, what is the unit cell volume? a) 1.17^ x^108 pm3^ d)^ 4.70^ x^ 1oo^ Pm' b) 2.35^ x^100 pmt^ o (^) - --^ ,*,/ e)^ 1.77^ x^ lo6^ pm -m (^) 2'35x10'Pm' ,""il (^) +
The volume of a sample of^ gas measured at 25.0'C^ and^ 1.00^ atm^ pressure^ is^ 10.0^ L.^ What^ must
the final temperature be^ in order for^ the^ gas^ to^ have^ a^ final volume of^ 7.5^ L^ at^ 1.00^ atm
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-:,zi,a{(.iL (^) 1- d. (^) -3s.c Il =
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E -?9^ -c ?,'=^
I (^) ^+'-^ P, (^) -- i"u'l."l^ e' 1e"c^ J -i , 't^ , -c' (^) -4s"c V{ -.{LloL^ rri.rl.iu. l--fd- f+r7T An empty 2.0 L soda bottle is tightly capped atzl"Cand^ 650 mmHg.^ tf^ the^ bXttle^ is^ pkt6i^ in-^
C
water at 95"C, what^ is^ the^ pressure in^ the^ bottle?
a. 520 mmHg b. 780 mmHg t_c. \ 810 mmHg
L_s
- Calcium nitrate will^ react^ with^ ammonium chloride^ at^ slightly elevated temperatures,^ as
represented in the equation
Ca(Nog)z(s)+ 2NHacl(s) (^) ---+ 2Nzo(g)+ Cacl2(s)^ +^ 1zo(gi
A 3.00-mol sample of each reactant will^ give^ what volume^ of^ NzO^ at^ STP?
d. 930 mmHg e. 2800 mmHg
d. 44.8 L
67.2 L
a. 1"1.2 L b. 22.4^ L c. 33.6 L
I (^) "^.rlqr"b NrCt;l
-a F x^ 2?'-+-)^ 'a" 6'?'z L
The density of^ a^ gas^ is^ 3.48^ g/L^ at^ STP.^ What^ is^ its molecular weight?
a. 44.6 g/mol r ,^1 *
b. 224g/mol (^) ?frt.,- d {^ t ..f[l (^) 78.o g/mot i 2r FA,..=j;:
.=
Which of the following has the lowest doiling point?
a. HzO
b. HF
Ta:1 HCt
L.--'
d. 32.0 g/mol e. I47 g/mol I r (^1) 5ir, lin *$_\ "(
HBr
HI
a..r-E"rrlL y^ t:.^ n k-21 y'r1 3
The information given^ below^ may^ be^ useful. Many^ other^ relations^ may^ also be derived'
Equations
ldeal gas^ equation;^ PV^ =^ nRT,^ also^ expressed in^ terms of density^ as PM
= dRT
Real gas^ equation;^ O^ =
#;U, #^
(also known as^ Van der Waals^ equation)
Root mean square^ velocity^ of^ a^ gas; u^ =^ (1Y)''' \M )
clausius-clapeyronequation;lnL =^
AH"-f (^) I I) P *[T^ t]
Volume of^ a^ sphere^ =+, Volume of^ a^ cube^ =^ F
The edge length^ of^ the^ cubic^ unit^ cells
l= 2r (for^ a^ simple^ cubic cell)
t (^) = I (for^ a^ body centered^ cubic cell)
J
I (^) =2t/2r or simply^ 1=^ (t/8)r^ (for^ a^ face^ centered^ cubic^ cell)
Metric and other unit^ conversions
1 m = l-.0x102 cm^1 Kg^ = 1.0^ x103 g
1 m^ =1.0x10e nm^1 KJ^ =^ 1.0^ x103J
i. m (^) =1.0x1012 pm^ l-^ atm=760^ mmHg^ l-^ atm=1'01325x10s^ Pa
Constants
R (^) =0.0821 L. atm/(K. mol)
R= 8.3145 J/(K.mol)
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