Quiz2 E01-E03

Quiz2 E01-E03 - Chemistry 6A Fall 2008 QUIZ 2 UCSD PID:

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Unformatted text preview: Chemistry 6A Fall 2008 QUIZ 2 UCSD PID: |A|__|__|__|__|__|__|__|__| ________________@ucsd.edu E-mail: Printed Last Name: ________________________________ Printed First Name: ________________________________ Signature: ________________________________________ Total Points: _______________ / 20 You have 10 mins to complete this quiz. Please show all your work, but write the answers in the designated spaces. The points allotted for each question are indicated in parenthesis. Include all units where appropriate! 
 Potentially Helpful Constants: Potentially Helpful Equations: ‐31
kg
 Mass
of
electron,
me
=
9.10938
x
10 EK
=
1/2mv2
 Mass
of
proton,
mp
=
1.67262
x
10‐27
kg
 Mass
of
neutron,
mn
=
1.67493
x
10‐27
kg
 







 Fundamental
charge,
e
=
1.60218
x
10‐19
C
 
 g
=
9.80665
m•s‐2
 c
=
νλ
 c
=
2.99792
x
108
m•s‐1
 E=
hν
 h
=
6.62608
x
10‐34
J•s
 15 E=
½
mv2
 R = 3.29 x 10 λparticle
=
h/(mv)
 ½
mv2=
hυ
‐
ϕ
 Potentially Helpful Conversion Factors: 1
J
=
1
N•m
 ν
=
R
{
1 12‐
1 22} ‐2
 1
N
=
1
kg
m
s 1
L
=
103
cm3
 
 
 
 
 1. When
UV
light
(frequency
1.15x1015hz)
is
shined
on
a
metal
surface,
 electrons
are
detected
leaving
the
surface
with
a
kinetic
energy
of
 4.09x10‐19
J.
What
is
the
work
function
ϕ
of
the
particular
metal
(5
pt.)
 
 Use
½
mv2=
hυ
‐
ϕ,
and
solve
for
ϕ
(½
mv2=
4.09
x
10­19
J
and
υ=
1.15
x
1015
Hz)
 
 Answer:
3.53
x
10‐19

 
 
 
 
 
 
 
 
 2. True
or
False
(5
pt.)
 a. 








F










The
uncertainty
principle
was
formulated
by
de
 Broglie.

 b. 










F








According
to
quantum
mechanics,
we
can
always
tell
 the
position
of
an
electron
with
100%
accuracy.
 c. 












F






The
letter
used
to
indicate
an
orbital
with
l
=
2
is
s.

 d. 








T










As
the
energy
of
electromagnetic
radiation
increases,
 the
frequency
increases
and
the
wavelength
decreases.
 e. 








F










Emission
of
light
from
an
atom
occurs
when
an
 electron
moves
up
one
energy
level.

 
 3. A
baseball
weighing
5.3
ounces
(1
ounce
=
28.3
g)
is
thrown
at
a
speed
 of
41
m/s.
What
is
its
wavelength
if
the
baseball
can
be
thought
of
as
a
 particle.
(4
pt.)
 
 
 Use
λparticle
=
h/(mv),
and
solve
for
λ;
convert
5.3
oz
to
kg
first
 Answer:
1.08
x
10‐34
m
 
 
 
 
 
 
 
 
 
 
 4. An
atom
has
a
principal
quantum
number
n
=
6.

 a) How
many
values
of
the
quantum
number
l
are
there?
List
them.
 (2
pt.)
 















































0,1,2,3,
4,5
(so
6
values)
 
 
 b) How
many
values
of
ml
are
allowed
for
an
electron
in
a
5f‐ subshell?
(1
pt)
 
 













































f‐subshell,
l
is
then
3,
so
ml
=
­3,­2,­1,0,1,2,3

 
 
 
 or,
7
values
 
 c) Draw
representative
shapes
for
each
of
the
following
orbitals
on
 the
coordinate
plane
(3pt.
)
 s‐orbital
 p‐orbital
 d‐orbital
 See
p.

29
of
text
for
representatives
of
orbitals.

 
 ...
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This note was uploaded on 12/07/2009 for the course CHEM CHEM 6A taught by Professor Czarkowski during the Fall '07 term at UCSD.

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