College Chem 1: Module 5 Exam

The electron in a hydrogen atom, originally in level ​n = 8, undergoes a transition to a lower level by emitting a photon of wavelength 3745 nm. What is the final level of the electron? ​(c=​3.00×108 m/s, h=6.63×10-34 J·s, RH=2.179×10-18 J) a. 6 b. 1 c. 5 d. 9 e. 8

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What is the ground-state electron configuration of tantalum (Ta)? a. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6 5d^3 b. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6 4d^10 4f^14 5s^2 5p^3 c. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 4f^14 5s^2 5p^6 5d^3 6s^2 d. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^3 e. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 4f^3

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Which of the following statements is incorrect? a. The set of quantum numbers n = 2, l = 2, ml = 1, ms = is not permitted because n = l. b. The set of quantum numbers n = 4, l = 3, ml = -1, ms = 0 is not permitted because ms = 0. c. The set of quantum numbers n = 3, l = 2, ml = 1, ms = is permitted. d. The set of quantum numbers n = 3, l = 2, ml = 0, ms = is not permitted because ml = 0. e. The set of quantum numbers n = 3, l = 2, ml = 3, ms = is not permitted because ml exceeds l.

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According to the building-up principle or aufbau principle, which subshell is typically filled next after the 5f subshell? a. 6d b. 4p c. 7s d. 3d e. 5s

a

The angular momentum quantum number is best associated with the a. shape of the orbital. b. number of orbitals in a subshell. c. energy of the orbital. d. orientation in space of an orbital. e. none of the above

a

Which of the following statements concerning quantum mechanics is/are true? 1. The behavior of submicroscopic particles can sometimes be described as waves. 2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom. 3. The uncertainty principle is important only for particles of very small mass, such as the electron. a. 1, 2, and 3 b. 2 and 3 c. 1 only d. 3 only e. 2 only

a

An atom of which of the following elements has the largest atomic radius? a. O b. Li c. N d. C e. F

b

How many orbitals have the set of quantum numbers n =4 and l = 2? a. 3 b. 5 c. 7 d. 1 e. 9

b

The statement that "the lowest-energy configuration for an atom is the one having the maximum number of unpaired electrons allowed by the Pauli principle in a particular set of degenerate orbitals" is known as a. the aufbau principle. b. Hund's rule. c. the quantum model. d. Heisenberg uncertainty principle. e. the Pauli exclusion principle.

b

What is the ground-state electron configuration of terbium (Tb)? a. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6 5d^10 6s^1 b. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 4f^9 5s^2 5p^6 6s^2 c. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 4f^14 5s^2 5p^3 d. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6 5d^9 6s^2 e. 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^9 4f^10 5s^2 5p^6 6s^2

b

Which of the following atoms is paramagnetic in its ground state? a. mercury (Hg) b. sodium (Na) c. nobelium (No) d. neon (Ne) e. barium (ba)

b

Which of the following elements would be expected to have chemical and physical properties most similar to those of the krypton (Kr)? a. sodium (Na) b. neon (Ne) c. gallium (Ga) d. chlorine (Cl) e. tin (Sn)

b

Which of the following is a representation of a 1s orbital?

b

Who postulated that energy is radiated only when an electron falls from a higher-energy level to a lower-energy level? a. Millikan b. Bohr c. Einstein d. Rutherford e. Heisenberg

b

An atom of which of the following elements has the largest ionization energy? a. Pb b. Bi c. At d. Po e. Cs

c

Based on the photoelectric effect, Einstein proposed the idea that a. particles can show characteristics of waves under certain experimental conditions. b. the wavelength of light is inversely proportional to its frequency. c. light has particle-like properties. d. the energy of a single particle or photon of light is inversely proportional to its frequency. e. the energy of an object is proportional to its mass.

c

How many p orbitals are in the n = 3 shell? a. 5 b. 1 c. 3 d. 6 e. 0

c

The change in energy for which of the following processes represents the first ionization energy of iodine? a. I(g)→ I2+(g) + 2e- b. 2I-(g)→ I2(s) + 2e- c. I(g)→ I+(g) + e- d. I(g) + e - → I-(g) e. I-(g)→ I+(g) + 2e-

c

What is the valence-shell electron configuration for the fourth-period element in Group VA? a. 4s23d3 b. 5s24p5 c. 4s24p3 d. 5s25p5 e. 4s25p5

c

Which quantum number distinguishes the different shapes of the orbitals? a. n b. ml c. l d. ms e. any of these

c

A possible value of the magnetic quantum number ml for a 5p electron is a. 6. b. -5. c. 4. d. 1. e. -3.

d

In which of the series of elements listed below would the elements have most nearly the same atomic radius? a. Na, Mg, Al, Si b. F, Cl, Br, I c. Na, K, Rb, Cs d. Sc, Ti, V, Cr e. B, Si, As, Te

d

The elements that are filling the 5f subshell are called a. alkali metals. b. lanthanides. c. main-group elements. d. actinides. e. transition elements.

d

What is the value of the angular momentum quantum number for an electron in a 1s orbital? a. 1 b. 3 c. 2 d. 0 e. 4

d

What is the wavelength of a photon that has an energy of 4.35 x 10^-16 J? (c = 3.00 × 108 m/s, h = 6.63 × 10-34 J · s) a. 8.65 x 10^-32 nm b. 6.56 x 10^-51 nm c. 1.3 x 10^2 nm d. 0.457 nm e. 4.35 x 10^-7 nm

d

Which of the following orbital diagrams represents a diamagnetic atom? 1s 2s 2p: a. arrow up/down, arrow up/down, partial arrow up, arrow up, empty. b. arrow up/down, arrow up/down, partial arrow up/full arrow down, partial arrow up. c. Arrow up, empty, empty, empty, empty. d. arrow up/down, arrow up/down, empty, empty, empty e. arrow up/down, arrow up/down, partial arrow up, empty, empty.

d

An atom of which of the following elements has the smallest first ionization energy? a. P b. Ca c. F d. Si e. Rb

e

An atom of which of the following elements has the smallest ionization energy? a. S b. Si c. P d. Cl e. Na

e

The _____ of a wave is the number of wavelengths of that wave that pass a fixed point in one unit of time and its unit is _____. a. current, ampere b. period, second c. wavelength, meter d. intensity, candela e. frequency, hertz

e

What is the frequency of photons that have molar energy of 339.00 kJ/mol? (c​ = 3.00 × 108 m/s, h ​= 6.63 × 10-34 J·s, ​NA = 6.02 × 1023 mol-1) a. 5.87×10-31 Hz b. ​5.63×10-19 Hz c. ​2.83×106 Hz d. ​1.69×10-10 Hz e. ​8.49×1014 Hz

e