ENGR 271 TESTS 1 3 2 
MTE 271 EXAM #1
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Please write your name on the cover sheet
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CWID#:
112'13740
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1.
a) (16 pts) What are the four major types of bonds in materials and briefly describe them?
S~rt. s(Xci h't.. elu?~.s
(v-t-flj o{il'Cc-h~ed) stTnvj N-t ',t'w r 0. toM \;Jo- VI r; +o k +
I. (o\(O\ltn+ - i. 0\H1YYl.s
.
\t{ ~
'L, J:Q'V\',c. - OM
Ol V\
e:kc t-f'lYVI /
3. M-e-l~\l;c_.- )V\..etaJs
Von ~r
\o~!
WC\o...\s -
c..lA.C\
$~~
'-._./
r
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(}It-oIV'
to ~~ vt...
£..t,
~
e,.u.c.tC-OA
1.7((~
rr-
I
50 y1..e.. L! t-.~
~
6) (COIr,,,,,,
(U.V1I"6V\). C G4 t-t M S
VxC0f\-U5
('t'\.(MA
0.(1\
100\"\ ~
oH~r
w; r h
QiV1S
o._ ~ ~ 8Y" !
I', -I-j
tiRo. 't of-
It o\ir~lt.. fl"\O\Y (r'\~
') /
t.,,-t-
eL,QCtvl>(\~
ecc
I
vJ4r-e..
p()~\i":'lJ"e~ jG\+'\,/"e.
e Lz.c -\-IDS~ t7 c., VC
t.-X-OI
(X\
cW:>J~,R.S
C>(\...t.
"'V'(,
el"\.9\.)
k,
_-
_-
(3) MgO -
:to'Y\\c..
/
~onic-type
crystals
I
a) (5 pts) Using the provided crystal diagram on the next page, what is the coordination number ofKBr
(show your work for full credit) ifrK+ = 0.133 nm and rSr-= 0.196 nm?
eN
r (o'/n"'-cY'
0;..
I,;,(\""'"
• t ~(.p tI m
_
•
r,AY\;--M
';
•
(p 7 I
b) (15 pts) Using the crystal structure determined from above and the radius values given, calculate the ionic packing fraction for KBr (show all work for full credit)?
0l -- 1... rI(t- +
1...'(f!,t"':
()._;. Z.(_.1~31'\"")t'Z(.I"&flm)
Lf(-11't'(r~+-)3)+
~3
~ *'if~133~""(.lq{PJ)
(. (,58)3
L-.\t-tJ\tlYY\S rl\u(\)(~\\r))
JrP f ~0......
I or
\fo\1J(VU.-
u~\r
-vo\WV\L6f
1- ~ t'tr-N'
)
~
o» eN ~ (JJ
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SEE BACK
~(~i\(r~r~)~)+
TABLE 2.1
,
'''-it
.
"
Coordination. ~'Umb(iSfor Ionic
B9n.~ing
-," ..
Coordination
Radius ratio,
number
rlR
2
r
()« R
U.lS5
r
0.225 ~
6
0.414
i
<.0.225
<
o.~14
<
0.732
,.
<. -
-R
0.732
Coordination
~'(.\omctr,.
-c 0.155
.s R
4
.'
<. :_ <: )
- R
12
"Thegeometry on the left is
.:»
Please write your name on the cover sheet
I
CWID#:
112'13740
C7, av'"
"""\
•
.;)j.,~e
'J
nol
I ,,-)
SEE BACK
1.
a) (16 pts) What are the four major types of bonds in materials and briefly describe them?
S~rt. s(Xci h't.. elu?~.s
(v-t-flj o{il'Cc-h~ed) stTnvj N-t ',t'w r 0. toM \;Jo- VI r; +o k +
I. (o\(O\ltn+ - i. 0\H1YYl.s
.
\t{ ~
'L, J:Q'V\',c. - OM
Ol V\
e:kc t-f'lYVI /
3. M-e-l~\l;c_.- )V\..etaJs
Von ~r
\o~!
WC\o...\s -
c..lA.C\
$~~
'-._./
r
I
(}It-oIV'
to ~~ vt...
£..t,
~
e,.u.c.tC-OA
1.7((~
rr-
I
50 y1..e.. L! t-.~
~
6) (COIr,,,,,,
(U.V1I"6V\). C G4 t-t M S
VxC0f\-U5
('t'\.(MA
0.(1\
100\"\ ~
oH~r
w; r h
QiV1S
o._ ~ ~ 8Y" !
I', -I-j
tiRo. 't of-
It o\ir~lt.. fl"\O\Y (r'\~
') /
t.,,-t-
eL,QCtvl>(\~
ecc
I
vJ4r-e..
p()~\i":'lJ"e~ jG\+'\,/"e.
e Lz.c -\-IDS~ t7 c., VC
t.-X-OI
(X\
cW:>J~,R.S
C>(\...t.
"'V'(,
el"\.9\.)
k,
_-
_-
(3) MgO -
:to'Y\\c..
/
~onic-type
crystals
I
a) (5 pts) Using the provided crystal diagram on the next page, what is the coordination number ofKBr
(show your work for full credit) ifrK+ = 0.133 nm and rSr-= 0.196 nm?
eN
r (o'/n"'-cY'
0;..
I,;,(\""'"
• t ~(.p tI m
_
•
r,AY\;--M
';
•
(p 7 I
b) (15 pts) Using the crystal structure determined from above and the radius values given, calculate the ionic packing fraction for KBr (show all work for full credit)?
0l -- 1... rI(t- +
1...'(f!,t"':
()._;. Z.(_.1~31'\"")t'Z(.I"&flm)
Lf(-11't'(r~+-)3)+
~3
~ *'if~133~""(.lq{PJ)
(. (,58)3
L-.\t-tJ\tlYY\S rl\u(\)(~\\r))
JrP f ~0......
I or
\fo\1J(VU.-
u~\r
-vo\WV\L6f
1- ~ t'tr-N'
)
~
o» eN ~ (JJ
~(\S
SW'{'U- CUIo ic.
SEE BACK
~(~i\(r~r~)~)+
TABLE 2.1
,
'''-it
.
"
Coordination. ~'Umb(iSfor Ionic
B9n.~ing
-," ..
Coordination
Radius ratio,
number
rlR
2
r
()« R
U.lS5
r
0.225 ~
6
0.414
i
<.0.225
<
o.~14
<
0.732
,.
<. -
-R
0.732
Coordination
~'(.\omctr,.
-c 0.155
.s R
4
.'
<. :_ <: )
- R
12
"Thegeometry on the left is