Chemistry 1B Winter 2016 MWF 9:30
Midterm 1
Test Form A
Constants: c = 3.0 ´ 108 m/s; h = 6.626 ´ 10-34 J s; me = 9.11 ´ 10-31 kg; mp = 1.67 ´ 10-27 kg; mn = 1.67 ´ 10-27 kg
1.
Light has a wavelength of 580 nm. What is the energy of a photon of this light?
A) 1.14 ´ 10–19 J
B) 3.42 ´ 10–19 J
C) 2.62 ´ 1018 J
D) 3.81 ´ 10–20 J
E) 1.28 ´ 10–18 J
2.
What is the wavelength, in nanometers, of a photon of light whose frequency is 5.38 ´ 1014 Hz?
A) 1.79 ´ 102 nm
B) 2.71 ´ 102 nm
C) 3.69 ´ 102 nm
D) 5.58 ´ 102 nm
E) 1.19 ´ 10–7 nm
3.
Consider an atom traveling at 1% of the speed of light. The de Broglie wavelength is found to be
3.31 ´ 10–3 pm. Which element is this?
A) He
B) P
C) F
D) Be
E) Ca
4.
The work function of a certain metal is 100 kJ/mole. What is the maximum wavelength of light that
can remove an electron from this metal?
A) 1197 nm
B) 188 nm
C) 1.197 nm
D) 349 nm
E) 643 nm
5.
What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls
from the n = 5 level to the n = 2 level?
A) 5.12 ´ 10–7 m
B) 4.34 ´ 10–7 m
C) 6.50 ´ 10–7 m
D) 5.82 ´ 10–7 m
E) none of these
6.
In a hydrogen atom, which of the following transitions gives light of the longest wavelength?
A) n = 4 to n = 3
B) n = 4 to n = 2
C) n = 4 to n = 1
D) n = 3 to n = 2
E) n = 2 to n = 1
7.
Calculate the energy (in kJ/mol) required to ionize B4+ (a boron atom with one electron in the ground
state).
A) 1312 kJ/mol
B) 1,312,000 kJ/mol
C) 32,800 kJ/mol
D) 5.45 ´ 10–20 kJ/mol
E) 11,808 kJ/mol
8.
One of the emission spectral lines for Li2+ has a wavelength of 121.7 nm for an electronic
transmission that begins in the state with n = 6. What is the principal quantum number of the lowerenergy state corresponding to this emission?
A) n = 1
B) n = 2
C) n = 3
D) n = 4
E) n = 5
9.
For the particle in a box quantum model, discrete energy separation arises from:
A) boundary conditions that require the electron wave function ψ to be zero at x = 0 and x = L.
B) any solution that satisfies the Schrodinger equation.
C) the deBroglie wavelength of the electron.
D) the Heisenberg uncertainly principle.
E) the Born interpretation of the wave function ψ.
10.
An electron in a one-dimensional box of length 50 pm (1012 pm = 1.0 m) is excited from the ground
state to the excited state of n = 8. What is the photon energy of this transition?
A) 2.41 ´ 10–17 J
B) 1.69 ´ 10–16 J
C) 3.04 ´ 10–15 J
D) 2.41 ´ 10–14 J
E) 1.52 ´ 10–15 J
11.
It is common for an atom to absorb more than one photon. If an atom absorbs two photons, one of
λ = 300 nm and another of λ = 200 nm, by how much has the energy of this atom increased?
A) 3.97 ´ 10–19 J
B) 1.99 ´ 10–18 J
C) 4.50 ´ 10–18 J
D) 1.66 ´ 10–18 J
E) 5.00 ´ 10–18 J
12.
Which of the following orbital designations is incorrect?
A) 1s
B) 3f
C) 3s
D) 16p
E) 4d
13.
How many orbitals in an atom can be designated as 4d?
A) 1
B) 2
C) 3
D) 4
E) 5
14.
What is the maximum number of electrons in an atom that can have the quantum numbers n = 2, ℓ =
1, m ℓ = -1?
A) 1
B) 2
C) 4
D) 9
E) 25
15.
What is the name of this orbital?
A) 2py
B) 2pz
C) 3dyz
D) 4fz3
E) 3dz2
16.
The angular quantum number, ℓ, of a 6d orbital is
A) 1
B) 2
C) 3
D) 6
E) 36
17.
In a single atom, what is the maximum number of electrons in an atom that can have the quantum
number n = 6?
A) 6
B) 12
C) 36
D) 72
E) 144
18.
What is the electron configuration of Al (Aluminum, Z = 13)?
A) 1s22s22p63s23p2
B) 1s22s22p63s23p1
C) 1s22s23s1
D) 1s22s22p63s23d1
E) 1s22s22p63s2
19.
What is the electron configuration of Ge (Germanium, Z = 32), an important element in
semiconductors?
A) [Ar]4s23d104p2
B) [Kr]4s23d104p2
C) [Ar]4s23d12
D) [Kr]4s23d12
E) [Ar]4s23d10
20.
A certain microwave oven delivers 1000 watts (J/s) of power to a coffee cup containing 50.0 g of
water at 25.0°C. If the wavelength of microwaves in the oven is 10.00 cm, how long does it take to
make the water boil at 100.0˚C? The specific heat capacity of water is 4.18 J °C −1 g−1.
A) 0.21 s
B) 12 s
C) 15.7 s
D) 0.31 s
E) 20.1 s
21.
How many unpaired electrons are in an atom of Mn (Manganese, Z = 25), in the ground state?
A) 1
B) 2
C) 3
D) 4
E) 5
22.
Arrange the atoms Ba, F and Si in order of increasing first ionization energy.
A) F < Si < Ba
B) Si < F < Ba
C) Ba < F < Si
D) Ba < Si < F
E) cannot determine from the information given
23.
Which element is most likely to have the following ionization energies:
I1 = 736 kJ/mol
I2 = 1,450 kJ/mol
I3 = 7,740 kJ/mol
I4 = 10,500 kJ/mol
A) Na
B) Ne
C) Mg
D) Si
E) Al
24.
Arrange the atoms B, F and Rb in order of increasing radii.
A) Rb < B < F
B) F < B < Rb
C) F < Rb < B
D) Rb < F < B
E) cannot determine from the information given
25.
What type of orbital has one angular node and one radial node?
A) 2py
B) 3py
C) 3dyz
D) 4pz
E) 4s