CHEM 6A Study Guide - Final Guide: Scantron Corporation, Photon, Unified Atomic Mass Unit

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2 Oct 2018
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Exam
Number:
22.
(3
pts.)
Turquoise
has
the
following
chemical
formula,
CuA1
6
(P0
4
)
4
(OH)g•4H
2
0,
how
many
hydroxide
ions are
in
a
sample
of
turquoise
that
contains
435
tg
of
hydrogen?
23.
If
light
of
wavelength
307 nm
is
incident
on
uranium
metal,
electrons
are
ejected
from
the
metal
with
a
velocity
of
5.4
x
lO
mis.
This
phenomenon
is
called
the
photoelectric
effect.
a)
(3
pts.)
Calculate
the
incident photon
frequency
in
Hertz
(Hz).
b) (3
pts.)
Calculate
the
incident
photon
energy.
c)
(4
pts.)
The
de
Broglie equation
was
key
to
the
development
of
the
concept
of
quantum mechanics
of
the
atom
by
Schrodinger. Calculate
the
de
Brogue wavelength
of
the
ejected
electrons.
d)
(4
pts.)
Calculate
the
binding energy
of
uranium,
the
minimum
energy needed
to
eject
electrons
from
uranium
metal.
Express
your answer
in
kJ/mol.
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CHEM 6A Full Course Notes
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CHEM 6A Full Course Notes
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To get your exam graded, do the following: Put the exam number that has been assigned to you (see the front page of your multiple choice section) on every page of this free response section of the exam. Put the exam number in the section on the scantron labeled exam number". I will neither give nor receive unauthorized assistance on this examinations . Exam number: if light of wavelength 307 nm is incident on uranium metal, electrons are ejected from the metal with a velocity of 5. 4 x lo mis. This phenomenon is called the photoelectric effect: (3 pts. ) Calculate the incident photon frequency in hertz (hz): (3 pts. ) Calculate the incident photon energy: (4 pts. ) The de broglie equation was key to the development of the concept of quantum mechanics of the atom by. Calculate the de brogue wavelength of the ejected electrons. (4 pts. )

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