CHM 1045 Test #4 December 4, 2000

Transcription

1 CHM 1045 Test #4 December 4, The scientist who was first to propose that electrons in an atom could have only certain energies was a. Planck. b. Einstein. c. Bohr. d. Rydberg. 2. Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy. a. radio, visible, infrared, ultraviolet b. microwave, infrared, visible, ultraviolet c. visible, ultraviolet, infrared, gamma rays d. X-radiation, visible, infrared, microwave 3. The FM station KDUL broadcasts music at 99.1 MHz. Find the wavelength of these waves. (c = 3.00 x 10 8 m/s) a m b m c m d m 4. A radio wave has a frequency of Hz. What is the energy of one photon of this radiation? (h = x Js) a J b J c J d J 5. The Bohr theory of the hydrogen atom predicts the energy difference (in J) between the n = 3 and the n = 5 state to be (E n = x x 1/n 2 J) a b c d e

2 6. The size of an atomic orbital is associated with a. the principal quantum number (n) b. the angular momentum quantum number (l) c. the magnetic quantum number (m l ) d. the spin quantum number (m s ) 7. The shape of an atomic orbital is associated with a. the principal quantum number (n) b. the angular momentum quantum number (l) c. the magnetic quantum number (m l ) d. the spin quantum number (m s ) 8. Atomic orbitals developed using quantum mechanics a. describe regions of space in which one is most likely to find an electron b. describe exact paths for electron motion c. give a description of the atomic structure which is essentially the same as the Bohr model d. allow scientists to calculate an exact volume for the hydrogen atom 9. Which of the following is a correct set of quantum numbers for an electron in a 3d orbital? a. n = 3, l = 0, m l = -1 b. n = 3, l = 1, m l = +3 c. n = 3, l = 2, m l = 0 d. n = 3, l = 3, m l = In the quantum mechanical treatment of the hydrogen atom, which one of the following combinations of quantum numbers is not allowed? n l m l a b c d e Which one of the following sets of quantum numbers can correctly represent a 3p orbital? a. n = 1 b. n = 1 c. n = 3 d. n = 3 e. n = 3 l = 3 l = 3 l = 2 l = 1 l = 0 m l = 0 m l = 3 m l = 1 m l = -1 m l = Each electron in an atom must have its own unique set of quantum numbers is a statement of a. the aufbau principle. b. the Pauli exclusion principle. c. Hund s rule. d. the periodic law. 2

3 13. Which one of the following statements about atomic structure and quantum numbers is incorrect? a. In a given atom, the maximum number of electrons having principal quantum number n = 3, is 18. b. The number of orbitals in a given f subshell is 7. c. For n = 4, the largest possible value of l is 3. d. For n = 4, the largest possible value of m l is 2. e. The following set of quantum numbers for a single orbital is not allowed: n = 3, l = 1, m l = Select the correct set of quantum numbers (n, l, m l, m s ) for the highest energy electron in the ground state of potassium, K. a. 4, 1, -1, 1/2 b. 4, 1, 0, 1/2 c. 4, 0, 1, 1/2 d. 4, 0, 0, 1/2 15. Select the correct electron configuration for Te (Z = 52). a. [Kr]5s 2 5p 6 4d 8 b. [Kr]5s 2 5d 10 5p 4 c. [Kr]5s 2 4d 10 5p 4 d. [Kr]5s 2 4f How many unpaired electrons in an isolated Te atom? a. 0 b. 1 c. 2 d. 3 e An atom of element number 33 (As) is in its ground electronic state. Which one of the following sets of quantum numbers could not apply to any of its electrons? a. b. c. d. e. n = 2 n = 3 n = 3 n = 4 n = 4 l = 1 l = 0 l = 2 l = 0 l = 2 m l = -1 m l = 0 m l = 2 m l = 0 m l = -2 1 m s = + m s = - m s = + m s = - m s = Select the valence shell electron configuration for cobalt. a. [Ar]4s 2 3d 7 4p 4 b. [Ar]4s 2 3d 7 c. [Ar]4s 2 3d 1 4p 6 d. [Ar]4s 2 4d 7 3

4 19. The cobalt atom is a. diamagnetic b. paramagnetic 20. Select the element with the largest atomic size. a. S c. Ba d. Po 21. Select the element with the smallest atomic size. a. Na b. Al c. Ga d. K 22. Arrange potassium, rubidium, calcium and strontium in order of increasing atomic size. a. K < Ca < Rb < Sr < K < Rb < Sr c. Ca < K < Sr < Rb d. K < Ca < Sr < Rb 23. Which one of the following equations correctly represents the process relating to the ionization energy of X? a. X(s) X + (g) + e - b. X 2 (g) X + (g) + X - (g) c. X(g) + e - X - (g) d. X - (g) X(g) + e - e. X(g) X + (g) + e Select the element with the largest first ionization energy. a. Na c. Cl d. Te 25. Arrange sodium, oxygen, fluorine, and potassium in order of increasing first ionization energy. a. Na < K < O < F b. K < Na < O < F c. K < Na < F < O d. Na < K < F < O 4

5 26. Select the element with the largest second ionization energy (IE 2 ). a. K c. Sr d. Al 27. Select the element with the greatest metallic character. a. Rb c. Cs d. Pb 28. Select the element with the least metallic character. a. Mn b. Sr c. Tl d. Ge 29. Select the most acidic compound from the following. a. SO 2 b. Al 2 O 3 c. CaO d. PbO 30. Select the valence shell electron configuration for V 3+. a. [Ar]4s 2 3d 2 b. [Ar]4s 2 c. [Ar]3d 2 d. [Ar]4d 2 e. [Ar]4s 2 3d Select the most basic compound from the following. a. Bi 2 O 3 b. SiO 2 c. Cs 2 O d. MgO 32. Which of the following elements will form a cation with a +2 charge? a. Si b. Sr c. Ga d. Cs 5

6 33. Select the paramagnetic ion. a. Zn 2+ b. Al 3+ c. Cr 3+ d. Sc Arrange these ions in order of decreasing size. a. P 3- > Cl - > K + > Ca > K + > Cl - > P 3- c. K + > Cl - > Ca 2+ > P 3- d. K + > Cl - > P 3- > Ca In modern atomic theory the electron is treated as both a particle and a. an anti-electron b. a quark c. a gluon d. a wave 36. Which of these represents an s orbital? 6