Exam 3 [Gen Chem]
An object is moving at 12.0 mi/h. What is its wavelength at this speed if the object has a mass of 84.5 kg? (1 mi=1609.3 m)
1.46x10⁻³⁶ m
The AM station CHEM broadcasts at 1450 kHz. Find the wavelength of these waves.
207 m
The FM station KDUL broadcasts music at 99.1 MHz. Find the wavelength of these waves.
3.03 m
Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation. (1 nm = 10⁻⁹ m)
3.2x10⁻²⁰ J
Green light has a wavelength of 5200 Å. Calculate the energy of one photon of green light. (1 Å=10⁻¹⁰ m)
3.8x10⁻¹⁹ J
In a single atom, what is the maximum number of electrons which can have quantum number n=5?
32
How many photons are in a flash of light that contains 123 kJ of energy if the wavelength of the light is 675 nm?
4.18x10²³ photons
An object is moving at 36.0 mi/h. What is its wavelength at this speed if the object has a mass of 84.5 kg? (1 mi=1609.3 m)
4.87x10⁻³⁷ m
How many photons are in a flash of light that contains 189 kJ of energy if the wavelength of the light is 525 nm?
4.99x10²³ photons
How many valence electrons are there in an atom with the electron configuration [noble gas]ns²(n-1)d¹⁰np³
5
Which of the following sublevels is filled last? 4d, 5s, 5p, 5d, 6s
5d
How many valence electrons are there in an atom with the electron configuration [noble gas]ns²(n-1)d¹⁰np⁵
7
Which of the following elements is paramagnetic? A) Ti B) Xe C) Hg D) Ca E) Rn
A
Which of the following colors of electromagnetic radiation has the lowest frequency? A) yellow B) blue C) orange D) purple E) green
C
Which of the following elements has the least metallic character? A) Sn B) Sr C) Ge D) Ga E) Tl
C
An atom of arsenic (Z = 33) is in its ground electronic state. Which one of the following sets quantum numbers could not apply to any of its electrons? A) n = 2, l = 1, ml = -1, ms = +½ B) n = 3, l = 0, ml = 0, ms = -½ C) n = 3, l = 2, ml = -2, ms = -½ D) n = 4, l = 0, ml = 0, ms = -½ E) n = 4, l = 2, ml = 2, ms = -½
E
Atomic orbitals developed using quantum mechanics ___ A) give a description of the atomic structure which is essentially the same as the Bohr model B) are in conflict with the Heisenberg Uncertainty Principle C) describe exact paths for electron motion D) allow scientists to calculate an exact volume for the hydrogen atom E) describe the regions of space in which one is most likely to find an electron
E
Select the correct electron configuration for Te (Z = 52) A) [Kr]5s²5p⁶4d⁸ B) [Kr]5s²5d¹⁰5d⁴ C) [Kr]5s²4d¹⁰5p⁶ D) [Kr]5s²4f¹⁴ E) [Kr]5s²4d¹⁰5p⁴
E
Select the element with the greatest metallic character. A) Li B) Ca C) Al D) Pb E) Ba
E
Which of the following atoms will be diamagnetic? A) Cr B) Ru C) Fe D) Pt E) Cd
E
Which of the following colors of electromagnetic radiation has the highest frequency? A) green B) red C) orange D) yellow E) blue
E
Which of the following elements has the largest first ionization energy A) Na B) Br C) Ca D) Te E) Cl
E
Which of the following elements has the smallest atomic size? A) Na B) Kr C) K D) Ca E) Ar
E
Which of the following is a correct set of quantum numbers for an electron in a 3d orbital? A) n = 3, l = 0, ml = -1 B) n = 3, l = 1, ml = +3 C) n = 3, l = 2, ml = +3 D) n = 3, l = 3, ml = +2 E) n = 3, l = 2, ml = -2
E
Identify the element of Period 2 which has the following successive ionization energies, in kJ/mol. IE₁, 1314 IE₂, 3389 IE₃, 5298 IE₄, 7471 IE₅, 10992 IE₆, 13329 IE₇, 71345 IE₈, 84087
O
When a wave encounters an obstacle or a slit that is comparable in size to its wavelength, it bends around it. This characteristic is called:
diffraction
An electron in the n=6 level emits a photon with a wavelength of 410.3 nm. To what energy level does the electron move?
n=2
An electron in the n=6 level emits a photon with a wavelength of 1094.1 nm. To what energy level does the electron move?
n=3
Electromagnetic radiation of 590 nm wavelength lies in the __________ region of the spectrum.
visible