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chemisfiy l0gPaselk-spring 2014
Exam I(l00pts)
Name
This is a closed book, closed note exam. work alone. use dimensional analysis whereverapplicable. Incrude units in "o.*u"r.
-srow aricailuil;o, in space provided.
If you don't show the work, you wonrt get any credit!
Possibly Useful Formulc and Constants
N : 6.022 x 1023 mol-l
mp:1.0073 amu ms:5.486 xl0-4 amu
2 Points Extra Credit! What is the mass of one molecule of Sg in amu?
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Total
Score
/36
,?0
t34
/2
/-'/
(12) l. Provide a name or formula for the following
^d
-, NaNO3 SJ'r !.,.r,{ V r4\ru.$e Manganese dioxide /Ul
^ O=
tqr\rr-, - '
'b\[o'n Sbz(So:)r Arsf-,,^r^, (uD s.^1.(; t= Ferrous ion Fjo
cuS 4"r'-r (t\ s.-\41I- Gold(gf chloride A,^ CQ ,-Tt-
(24) 2. Circle the best answer to the following questions. No work need be shown.
a. What is the apparent charge on Br in HBro3? ft: +[
' o > - >-
(.+ \)*B .lffz) =D ; 9r: tk\ = rS
+3 +2 +4 @ none ofthese
b. The correct structure for calcium hydrogen carbonate is:
caco3 ca(cor)z @ @noneofthese.
c. The mass, in grams, of one mole of potassium chromate (K2Cr2O4) is: f(ff.D* 16-)q(rc'o)= v\b'zo
t23.t 2t6.0 @ rc6.22 none of these
=73
f. Metal pellets weighing 19,4 g are added to a graduated cylinder. The waler level risesf rom|7,7|mltol5.4bmL.Thedensi tyortnimetal , ' r=f f=f f i=1.>|
2.69 cm3 r9.4 grcm3 @ 0.139 cm3rg
*
(l0.s0y(6.02 x l0rfE
d. One boron atom weighs:
t0.S0 e (10.80)(6.0, * 1s23) amu
(10.80y(6.0, * 1923) amu none of these
e. The percentage of oxygen in coz is /-3G::Dx /oD = -1?'7 |
32 @ 36 \tz'at *Y-'
43
(10) 3. A binary compound composed of only lead and oxygen is found to contain 90.67%lead by mass. Determine the empirical formula of the compound. Show Work.
-trb , loo- 7O'c7 = l'i39o
+Iaggv-v,+ tA og .-.*tr\--
-r ar ? O'GTIhoLa-tb.trtfr. =O.\37 C2D t{Dt 1rr-=---:--
O.9'3lz, ' , .Pu^-o[ Ct =
P\,+:rc c-e:Ees;;ffi 6 {t77c' +€u,
or.r)^,9o.
x+
(8) 4. Balance the following equations by filling in all the blanks with whole number coefficients, even ithe coefficient is L \
t1/ ' ta
2 Moszro+ 7 ozk)- 2.vtoor,"y+ 4so26;
133l
L Fecl3lo+ 3 Hzoro- 3 HClloqy+ \ pe(ou):r, l
(12) 5. Given the chemical reaction
4NH31gy+3Oz1gy- 2Nztel + 6tk-Oel'' i
Calculate the maximum mass ofwater (in grams) that can be obtainedfrom 12.0 g of NH3 (MW: 17.03) and excess Oz. Show Work
Finrt ra.re. t ,,^c L-- D*.'
g'or* = o '1o+u,,^-Q11.ot&"
fu^ oi* co^+ ,A tffiio
Gx.--tok6*)= l-0fl,*e Hro
= t ,?o4 * /D'
t [1'oxf irtt( o nA\x,x l'oog 6 16'")f-
(10) 6. Fill in the blanks in the following table:
IsotoneAZDne
A+ /' z6 9,2_q-_- 68 gG /
3l -tg "'- w --- l7/.
(24) 10. Answer the following questions regarding the periodic table and the elements:
a. What is the charge on Group II-A ions? Z+
b. What is the formula for a zinc ion? Z".'o
c. Name an element occurring as a liquid at room temperature. r,r^rrc*l (*g) o. B*"ni*(Di
d. What charge would you expect for the As elemental ion? -3
e. What is the formula for elemental silver? A 1f. What is the general name for the Group 18 elements? n)o!rt- 1^.rrlr
( f.n + t.r"r\
g. The elements with the highest average ratios of neutrons to protons are located where on the
Periodic Table? (hint, look at the Periodic table and atomic masses) b ottuq
h. Which reactive element has the most attraction for electons? F
i. Which elements are called the halogens? C"rD.^e t1 or Ul(S
j. What charge would you expect for the Ga elemental ion? 3f
k. What is the charge on a hydride ion? - \
l. What is the name for Groups 3-12 on the Periodic table? Tr-, r'r*5.t ,,a*>tt
52cr+5
rrafi-/ n4P3-
II1