Electromagnetic Radiation/de Broglie
Dimensional Analysis
Periodic trends/Subatomic Particles
Electron Config./Quantum Numbers
¯\_(ツ)_/¯ Who Knows?
100
Light is both a ______ and _______ .
Light is both a wave and particle.
100
What is the multiplier for nano (n)?
10-9
100
What are the charges and weight for protons, neutrons, and electrons?
Protons weigh 1 amu and have a positive charge. Neutrons weigh 1 amu and have a neutral charge. Electrons weigh 0 amu and have a negative charge.
100
Write the electron configuration for titanium (Ti) and determine if it is paramagnetic or diamagnetic. (Hint: It might be helpful to write out an orbital diagram)
1s22s22p63s23p64s23d2 or [Ar]4s23d2
Titanium is paramagnetic.
100
How many sig. figs. are in this number: 0.0000045000
5 sig. figs.
Leading zeros are not significant
200
When an electron is accelerated through a particular potential field, it attains a speed of 9.38 x 106 m/s. What is the wavelength of this electron in meters? (Mass of an electron: 9.11 x 10-28 g).
λ=7.75 x 10-14 m
200
Convert 70 miles per hour into feet per second.
1.0 x 102 ft/s
200
The "Demon core", a plutonium sphere that was tested to be an atomic bomb, contained 14 lbs of plutonium-239.
How many protons and neutrons are in plutonium-239? What is the atomic weight of plutonium-239?
Plutonium-239 had 94 protons and 145 neutrons. Plutonium-239 has an atomic mass of 239 amu.
200
What are all the possible quantum numbers when n=1?
n=1,l=0,ml=0,ms=+1/2
n=1,l=0,ml=0,ms=-1/2
(1s2 orbital)
200
Convert 325 pm to km.
3.25 x 10-13 km
300
What is the energy of one photon of orange light with a wavelength of 600 nm?
3.31 x 10-19 J/photon
300
How many carbon atoms are there in a diamond (pure carbon) with a mass of 70 mg?
3.5 x 1021 atoms of carbon
300
Rank these atoms from smallest to largest radius:
Ar, Ne, Kr
Ne<Ar<Kr
300
Write the full ground state electron configuration for chromium (Cr).
1s22s22p63s23p64s13d5 or [Ar]4s13d5
300
Which of the following transitions emits energy with the shortest wavelength?
a. n = 6 → n = 4
b. n = 2 → n = 1
c. n = 3 → n = 1
d. n = 1 → n = 6
The correct answer is C.
Short wavelengths have higher frequency and higher energy. Long wavelengths have lower frequency and lower energy.
400
What is the de Broglie wavelength of a 2.7-g ping pong ball travelling at 35 m/s in meters?
7.0 x 10-33 m
400
The "Demon core", a plutonium sphere that was tested to be an atomic bomb, contained 14 lbs of plutonium-239. (1 lbs = 453.592 g)
How many moles of plutonium-239 was in the sphere?
27 moles of p-329
400
Rank these atoms from highest to lowest ionization energy:
Ti, V, Sc
V>Ti>Sc
400
Write the electron configuration for Fe2+ with noble gas configuration.
1s22s22p63s23p63d6 --> [Ar]3d6
When removing electrons, starts with the s orbital first then the p and d orbitals (s orbital has the lowest energy out of all the orbitals)
400
Which of the following quantum numbers is incorrect?
a. n=2,l=1,ml=-1,ms=-1/2
b. n=3,l=2,ml=0,ms=+1/2
c. n=4,l=4,ml=3,ms=+1/2
d. n=1,l=0,ml=0,ms=-1/2
C.
Quantum Numbers:
n=1,2,3...
l=0,1,2,...(n-1)
ml=-l...0...+l
ms= -1/2 or +1/2
500
What is the total energy (in kJ) contained in 1.0 mol of photons, all with a frequency of 2.89 × 1014 Hz? (Hz =1/s)
115 kJ/mol
500
The Pacific Ocean has about 7.20 x 108 km3 of water. What is this volume in liters? (1 cm3=1 mL)
7.2 x 1020 L
500
Rank the following atoms from high to lower effective nuclear charge:
C,N,O,F
F>O>N>C
500
What is the wavelength (in nm) of a photon that falls from n=3 to n=1?
102 nm
500
Determine the relative abundance of Neon, given that it has 3 isotopes with the follow percent abundances (the average atomic mass of Neon is 20.18 amu):
Atomic Mass % Natural Abundance
20Ne 19.992 amu 90.51%
21Ne 20.993 amu x
22Ne 21.991 amu y
Relative abundance for:
21Ne=0.17%
22Ne=9.32%