Download Exam 2 Review Solutions

Leader:
Course:
Exam 2 Review
Supplemental I nstruction
lowa State University
1.
Emily M
Chem 167
Instructor: Houk
I)ate: 3ll0l14
Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and
Ar?
a) Mg>NDFSi>Ar
b) Ar>Si>PNDMg
c) Si>F>Ar>NDMg
@ N*tvtg>Si>F>Ar
e)
2.
Ar>P>Si>Mg>Na
Which of the fotlowing species has the tu.ge#uaiu"t
a) Rb*
b) St'l
@ B."
d) Kr
e) Ar
3.
4.
hr\$t\
Nq,
1ar1+s2ldr0+p' is the electron configuration of
\*b*
4ol-ftS
"lhrrn
!frtffYl
atom.
-
What is the grormd state electron configrration for Si?
6.1 ssLi*
5. Which of the following
is an excite&state eloctron configuration?
a) ls2 2s2 3pt
b) 1s2 z* zp6
(o)1s2 2s2
3sl
Y
2i
aJ
6.
tnrt
4s2 3dro 4pr
Which of the following has the smallest ionization energy.
a) Me
b) Se
,'e:)
4l a.{,t
@su
d) Po
;
7. Which one of the following sets of quantrm numbers corresponds
a) n: 6, l: l, ml= -Z,ms: *lD
b) n: 6,1:2,m1:0, ms: -ll2
q) n:5,1: 1, ml: -l,ms: -ll2
@ o: O, f:
f,
ml= -1, ms: *1/2
S=0
1060
to a 6p electron?
,,
\= \
Hixson-Lied Student Success Center
*
,,
d
--L,l=3
515.294.{fl24
*
[email protected]
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http://www.si.iastale.edu
8. Which one of the following
represents an acceptable possible set of quantum numbers
the order n, l, ml, ms) for an electron in an atom?
(in
z, l,-1,+ll2
@
b) 2,1,0,0
c) 2,2,0,+lD
d) 2,0,1,-lD
e) 2,0,2,+ll2
9.
The wavelength of a photon that has energy of 6.33* l0-'*J is
{--\y
10. The retina
4.6f
lD
-rB,].
=
(b.t tb*
/
l"*b
eye can detect light when radiant energy incident on it is ut
J. For light of 600 nm wavelength, how many photons does this correspond
of
16-,"dry++
"
a
nr$an
to? 0'ego+on =
I
\0.36r
1,I-lf-
+
=(r.uw r 16-?7
{sY!!$*t)
-_
S,g i x to-tT/lkafort
D 4.oxta-''r.+ffir@
ye[o#ilih, *i t waElea@ or95ffi?
l. whar is the frequency of
V
=.>=
3,0
[ rub fn ls
-4rn --
corresponds to photons with the largest energy?
",r\,/\--,
*,\,AAJ
Nmltltngh*
r\
xE
t
snu,\\u tNfi\ltlfi${t
= h5W ttu{unnut
{'- x'h', a' bi$}er '
fnDW
X is AE : 3.31 x lO20J. Calculate
the maximum wavelength of light that can photo eject an elecfion from metal X.
{
13. The energy required to remove an electron from metal
c lt"
14.
=
(b
= 3'3lY to'!n{
ff\ * t,:I^+b.;erA
) -- (r.00rlo-to
5ffi-dlFfrtriclt-are/at
light
616.4 and 638.3 nm"
at many wavefengths,
A neon atom emits
Both of these transitions are to the same final state.
a) What is the energy difference benveen the two states for each transition?
b?--Eyhotan
=P a5=
tc=ft^^tn,ttoyrt.4t-^.3^^-,^r-,-\l -btu'4
6rnx
!1glo
,,"F;PJi3;;ffi**;;;;'il,ffivereuf,;###.ffi
rientr \
of the uts[L:
would
wurllu be
uc the frequency (rl
LllE U.EquErrvJ
u' 4@
r#ffi
Lrrs
-
--(
= 4,L?-r b-r
-;;,,r, --.- ,t
d;3w
ll,6tiila:i%
:
I I I U0
^lA ""Ju
hffi*r;,;;r;ffi
15. Given the electronegativities below, which covalent bond is most polar?
Element:HCNO
2.1 2.5 3.0
Electonegativity:
3.5
a- C-H 0. 4
b. N-H b.9
€) GH l.rl
d- O-C 1,0
e. GN S.5
16.
Amorg the following molecules, only
a
BeClz
_
is polar.
-/
fi?l
/-N
Y etct,
6,
e.
\
Crz
(
17. Draw Lewis structures for the
hybridization of the
;i"-
a- cHzFz a [.-
atom, and the bond angle(s).
(,,
+AAldfd i N,, l&,6'
'P'
"
b. OFz
c. VOr'7
d.
following molecules. Give the shape of the molecule,
.7-ti 'i.i
''i1''
[]-i
"",1**#,
)
UItl ; sb3 ; 1l0q,5o
tr'3urut \qtun'Od ;s]31
<lgq'''
tt\qutu\ $nnri st't t'l-bo
,#-t\a
e. B"FrY"
:(- W)I' linnc; sU tBo,
J
r.
PBr5
ii
u"'\&
6
drJ
{frqunut \r,\ruln,dd
i Qa,lnt'
18. The total number of o bonds in the H-CEC ,CEC-CEC-CEN molecule is
a)4
a
B?,
e) 15
ft\su B 4r
bonds
m* 6
t9. In ethylene (H2C7CH2), the C=C double bond results
orbitais and
overlap
orbitals on the C atoms.
a) o, tp, rr,
b)
c)
of --TD
4Y
p
overlap
"f
+
o,#,",#
o, sp3,
er, s
o"Pl'o'P
@
e) 7L sp-, o, p
20. Which drawing represents a ec bonding molecular orbital for a homonuclear diatomic
molecule?
t)5
,-..
*
-
l0
c)
\",
d)o
,\
21. Which of the following molecular species is stabilized by resonance?
a) COz
:N=f.f-il, N-NzN
@ *,-
c) BH:
d) Or'e) HCN
\\=\[=
N
22.What is the coordination number for (a) simple cubic (b) body-centered
centered cubic?
SU=tp
cubic (c) face-
(Lt=tt
SL*B
23. Nickel crystallizes in a fuce-centered cubic lattice.If the density of the metal is 8.908
g/"rrf , what is the unit cell edge length in cm?
theory ofbonding in solids.
(a)Sr (b)Ti (c)C (d)Si doped with
tfttur Wltr
L < Si
\rtulttor
As (e)Si
aS duF\ *l fl* .r,*
btrtrltl,{\\u