Slide 1 / 72
Slide 2 / 72
Chemistry
Atomic Structures Practice Problems
2015-10-27
www.njctl.org
Slide 3 / 72
1
According to Einstein’s view of matter and
energy, what is the common link between light
and matter?
Slide 4 / 72
2
Slide 5 / 72
3
How does diffraction effect the double slit
experiment?
What is Chemistry?
Slide 6 / 72
4
The wavelength of light emitted from a traffic light
having a frequency of 6.15x10 14 Hz is _________.
Slide 7 / 72
5
An electromagnetic wave has a frequency of 6x 105
Hz. What is the wavelength?
Slide 8 / 72
6
Slide 9 / 72
7 An electromagnetic wave has a frequency of 9x10 -7 Hz.
What is the wavelength?
Slide 10 / 72
8
Slide 11 / 72
9
Electromagnetic radiation with a wavelength of
________ nm appears as green light to the human
eye. The frequency of this light is 5.71x10 14 Hz.
An electromagnetic wave has a wavelength of 5x
10-13 m. What is the frequency?
What is the frequency of yellow sodium light that
has a wavelength of 579nm?
Slide 12 / 72
10
Explain Newton’s original ideas about the nature
of light.
Slide 13 / 72
11
While standing in a room with two speakers
(speakers A and B), each emitting sound with a
wavelength of 2m, you notice you cannot hear the
sound. Compared to the closer speaker, what’s
the smallest difference in distance to the further
speaker (ignore reflection of sound off of walls
etc).
Slide 14 / 72
12
Slide 15 / 72
13
How are matter and energy related?
Slide 16 / 72
14
Slide 17 / 72
15
How does interference effect the double slit
experiment?
While standing in a room with two speakers
(speakers A and B) centered about the center of
the room, pointed at the wall. You notice you
cannot hear the sound while standing 1 meter
from the center of the far wall. What’s the next
distance from the center you could stand at that
would you to hear the sound at its loudest?
Why is the understanding of energy and matter
vital to one’s understanding of Chemistry?
Slide 18 / 72
16
A radio station broadcasts at 101.5 MHz. The
wavelength of the signal is __________ m.
Slide 19 / 72
17
An electromagnetic wave has a wavelength of 1.5
nm. What is the frequency?
Slide 20 / 72
18
Slide 21 / 72
19
An electromagnetic wave has a wavelength of 300 m.
What is the frequency?
Slide 22 / 72
20
Slide 23 / 72
21
An FM radio station broadcasts electromagnetic
radiation at a frequency of 99.5 MHz. The
wavelength of this radiation is __________ m.
An electromagnetic wave has a wavelength of
5x10-13 m. What is the frequency?
What is the frequency of orange lithium light that
has a wavelength of 650nm?
Slide 24 / 72
22
What is the frequency, in Hz, of electromagnetic
radiation that has a wavelength of 0.55 m?
Slide 25 / 72
23
What is the frequency of light, in Hz, that has a
wavelength of 1.23x10 -6 cm?
Slide 26 / 72
24
Slide 27 / 72
25
What is the wavelength of light (nm) that has a
frequency 4.25x10 14 Hz?
Slide 28 / 72
26
Slide 29 / 72
27
How are the properties of fluids in a tank, sound
from a set of speakers, and light passing through
a double slit all related to one another?
What is the wavelength of light (nm) that has a
frequency of 3.22x10 14 Hz?
Explains Hyugen’s original ideas about the nature
of light.
Slide 30 / 72
28
While standing in a room with two speakers
(speakers A and B) centered about the center of
the room, pointed at the wall. You notice you
cannot hear the sound while standing 1 meter
from the center of the far wall. What’s the next
distance from the center you could stand at that
would still prevent you from hearing the sound.
Slide 31 / 72
29
What is the energy of a photon that has a
frequency of 7.0 x 10 15 Hz?
Slide 32 / 72
30
Slide 33 / 72
31
What is the energy of a photon that has a
wavelength of 720 nm?
Slide 35 / 72
33
The wavelength of a photon that has energy of
5.65 x 10 -19 J is __________ nm.
What is the energy of a photon that has a
frequency of 4.5 x 10 15 Hz?
Slide 34 / 72
32
Electromagnetic radiation with a wavelength of 531 nm
appears as green light to the human eye. The energy of
one photon of this light is 3.74 x10 -19 J. Thus, a laser
that emits 2.3 x10 -2 J of energy in a pulse of light at this
wavelength produces __________ photons in each
pulse.
Slide 36 / 72
34 What is the frequency (Hz) of a photon that has
energy of 4.38 x 10 -18 J?
Slide 37 / 72
35 The energy of a photon that has a frequency of
7.75 x 10 14 Hz is __________ J.
Slide 39 / 72
37 Electromagnetic radiation with a wavelength of
525 nm appears as green light to the human eye.
The energy of one photon of this light is
__________ J.
Slide 41 / 72
39 What implication does the equation ρ=h/λ have on
how we view matter or anything with momentum.
Slide 38 / 72
36 What is the energy of a photon that has a
wavelength of 450 nm?
Slide 40 / 72
38 The energy of a photon that has a wavelength of
10.0 m is __________ J
Slide 42 / 72
40 What is the wavelength of an electron which has a
velocity of 3.5 x 10 7 m/s?
(me = 9.11x10-31 kg)
Slide 43 / 72
41 The de Broglie wavelength of a 12.0 gram bullet
traveling at the speed of sound is _________ m.
The speed of sound is 331 m/sec.
Slide 45 / 72
43 What is the wavelength of an electron which has a
velocity of 6.0 x 10 7 m/s?
(me = 9.11x10 -31 kg)
Slide 47 / 72
45 What is the wavelength of an electron which has a
velocity of 1.2 x 10 8 m/s?
(me = 9.11x10 -31 kg)
Slide 44 / 72
42 The de Broglie wavelength of an electron with
a velocity of 6.00 x10 6 m/s is __________ m.
(me = 9.11x10-31 kg)
Slide 46 / 72
44 Why would the dual nature of matter make it
difficult to observe very small particles like
electrons?
Slide 48 / 72
46 The de Broglie wavelength of a 10.0 gram whip
traveling at the speed of sound is _________ m.
The speed of sound is 331 m/sec.
Slide 49 / 72
47 The de Broglie wavelength of an electron with a
velocity of 1.30 x10 7 m/s is __________ m.
(me = 9.11x10-31 kg)
Slide 51 / 72
49 Why do neutral atoms have the same numbers of
protons and electrons?
Slide 53 / 72
51 Why was it important to use alpha particles in
order to discover the neucleus, as opposed to
gamma rays or beta particles?
Slide 50 / 72
48 What is the wavelength of an electron which has a
velocity of 4.0 x 10 7 m/s?
(me = 9.11x10-31 kg)
Slide 52 / 72
50 What about electrons allow them to be some of
the fastest traveling sub atomic particles?
Slide 54 / 72
52 Based on Bohr’s model of the atom, why do you
think electrons were the first subatomic particle to
be discovered?
Slide 55 / 72
53 Based off of the first experiments into the
composition of atoms, why were neutrons the last
particles to be discovered?
Slide 57 / 72
55 Why is it not possible for an electron to continue
in a set orbit around the nucleus like a planet
around the sun?
Slide 59 / 72
57 Give one example of black body radiation that you
see in your everyday life.
Slide 56 / 72
54 As more and more protons enter the nucleus of an
atom, increasing ratios of neutrons are needed.
Why do you think this is?
Slide 58 / 72
56 Explain how emission spectra of gasses helped
scientists to determine electrons traveled in
energy levels.
Slide 60 / 72
58 The binding energy of the hydrogen atom in its
ground state is -13.6 eV. What is the energy when
it is in the n = 4 state?
Slide 61 / 72
59 What is the energy of the second excited state (n=3) of
hydrogen?
Slide 62 / 72
60 What is the energy of the ground state (n=1) of
hydrogen?
Slide 63 / 72
61 How much energy does an electron in hydrogen
need as it jumps from ground state to the second
excited state?
Slide 64 / 72
62 If an electron returns from the second excited
state to ground state, what 3 Energies of photons
could it emit?
Slide 65 / 72
63 If an electron returns from the second excited
state to ground state, what 3 frequencies of
photons could it emit?
Slide 66 / 72
64 A Hydrogen electron drops from its sixth excited
state back down to its forth excited state.
A What are the n values associated with these two
states?
B How many different types of photons can it emit?
C
What is change in energy (in eV) associated
with each transition?
D
What is the frequency associated with each
of the emitted electrons?
E
What is the wavelength associated with each
of the emitted electrons?
F
What possible types of electromagnetic
radiation are given off during this transition?
Slide 67 / 72
65 The wavelength of a ruby laser is 694.3 nm. What
is the energy difference (in eV) between the two
energy states involved in laser action?
Slide 68 / 72
66 In state n = 1, the energy of the hydrogen atom is 13.58 eV. What is its energy in state n = 2?
Slide 69 / 72
67 If an electron returns from the second excited
state to ground state, what 3 wavelengths (in nm)
of photons could it emit?
Slide 70 / 72
68 If an electron returns from the second excited
state to ground state, what 3 types of EM
Radiation could it emit (if visible light is emitted,
include the color)?
Slide 71 / 72
69 The electron of a hydrogen atom makes a
transition from the n = 5 state to the n = 2 state.
What is the wavelength of the emitted photon?
Slide 72 / 72
70 A Hydrogen electron drops from its forth excited
state back down to its first excited state.
A What are the n values associated with these
two states?
B How many different types of photons can it emit?
C
What is change in energy (in eV) associated
with each transition?
D
What is the frequency associated with each
of the emitted electrons?
E
What is the wavelength associated with each
of the emitted electrons?
F
What possible types of electromagnetic
radiation are given off during this transition?