1. Ham radio operators often broadcast on the 6 meter band. The frequency of this electromagnetic radiation is MHz. a. 500 b. 200 c. 50 d. 20 e. 2.

Transcription

1 Name: Score: 0 / 60 points (0%) [1 open ended question not graded] Chapters 6&7 Practice Exam Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Ham radio operators often broadcast on the 6 meter band. The frequency of this electromagnetic radiation is MHz. a. 500 b. 200 c. 50 d. 20 e The energy of a photon that has a wavelength of 12.3 nm is J. a b c d e Of the following, radiation has the shortest wavelength and radiation has the greatest energy. gamma ultraviolet visible a. gamma, visible b. visible, gamma c. visible, ultraviolet d. ultraviolet, gamma e. gamma, gamma 4. What color of visible light has the highest energy? 1/16

2 a. violet b. blue c. red d. green e. yellow ANSWER: A 5. An electron in a Bohr hydrogen atom has an energy of J. The value of n for this electron is. a. 1 b. 2 c. 3 d. 4 e Calculate the energy (J) change associated with an electron transition from n = 2 to n = 5 in a Bohr hydrogen atom. a b c d e The n = 5 to n = 3 transition in the Bohr hydrogen atom corresponds to the of a photon with a wavelength of nm. a. absorption, 657 b. absorption, 1280 c. emission, 657 d. emission, 1280 e. emission, What is the de Broglie wavelength (m) of a 25 g object moving at a speed of 5.0 m/s? a b c /16

3 d e The de Broglie wavelength of a bullet (7.5 g) traveling at 700 m/s is m. a b c d e The subshell contains only one orbital. a. 5d b. 6f c. 4s d. 3d e. 1p 11. There are orbitals in the second shell. a. 1 b. 2 c. 4 d. 8 e The n = 1 shell contains p orbitals. All the other shells contain p orbitals. a. 3, 6 b. 0, 3 c. 6, 2 d. 3, 3 e. 0, 6 3/16

4 13. The total number of orbitals in a shell is given by. a. I 2 b. n 2 c. 2n d. 2n + 1 e. 2l Each p subshell can accommodate a maximum of electrons. a. 6 b. 2 c. 10 d. 3 e. 5 ANSWER: A 15. The second shell in the ground state of atomic argon contains electrons. a. 2 b. 6 c. 8 d. 18 e The 4d subshell in the ground state of atomic xenon contains electrons. a. 2 b. 6 c. 8 d. 10 e [Ar]4s 2 3d 10 4p 3 is the electron configuration of a(n) atom. a. As b. V c. P d. Sb e. Sn 4/16

5 ANSWER: A 18. There are unpaired electrons in a ground state fluorine atom. a. 0 b. 1 c. 2 d. 3 e The elements in the period of the periodic table have a core electron configuration that is the same as the electron configuration of neon. a. first b. second c. third d. fourth e. fifth 20. Elements in group have a np 6 electron configuration in the outer shell. a. 4A b. 6A c. 7A d. 8A e. 5A 21. Which group in the periodic table contains elements with the valence electron configuration of ns 2 np 1? a. 1A b. 2A c. 3A d. 4A e. 8A 22. Which one of the following is correct? a. ν + λ = c b. ν λ = c 5/16

6 c. ν = cν d. λ = cν e. νλ = c 23. In the Bohr model of the atom,. a. electrons travel in circular paths called orbitals b. electrons can have any energy c. electron energies are quantized d. electron paths are controlled by probability e. both A and C 24. The de Broglie wavelength of a 6.0 gram bullet traveling at the speed of sound is. The speed of sound is 331 m/sec. a. 2.7 x m b. 3.3 x m c x m d. 2.7 x m e. 6.6 x m 25. The uncertainty principle states that. a. matter and energy are really the same thing b. it is impossible to know anything with certainty c. it is impossible to know the exact position and momentum of an electron d. there can only be one uncertain digit in a reported number e. it is impossible to know how many electrons there are in an atom 26. Which one of the following is an incorrect subshell notation? a. 4f b. 2d c. 3s d. 2p e. 3d 6/16

7 27. Which electron configuration represents a violation of the Pauli exclusion principle? a. mc027 1.jpg b. mc027 2.jpg c. mc027 3.jpg d. mc027 4.jpg e. mc027 5.jpg 28. Which electron configuration denotes an atom in its ground state? a. mc028 1.jpg b. mc028 2.jpg c. mc028 3.jpg d. mc028 4.jpg e. 7/16

8 mc028 5.jpg 29. Which electron configuration represents a violation of Hund's rule for an atom in its ground state? a. mc029 1.jpg b. mc029 2.jpg c. mc029 3.jpg d. mc029 4.jpg e. mc029 5.jpg 30. Elements in the modern version of the periodic table are arranged in order of increasing. a. oxidation number b. atomic mass c. average atomic mass d. atomic number e. number of isotopes 31. A tin atom has 50 electrons. Electrons in the subshell experience the lowest effective nuclear charge. 8/16

9 a. 1s b. 3p c. 3d d. 5s e. 5p 32. The have the most negative electron affinities. a. alkaline earth metals b. alkali metals c. halogens d. transition metals e. chalcogens 33. The oxide of which element below can react with hydrochloric acid? a. sulfur b. selenium c. nitrogen d. sodium e. carbon 34. Metals can be at room temperature. a. liquid only b. solid only c. solid or liquid d. solid, liquid, or gas e. liquid or gas 35. Na reacts with element X to form an ionic compound with the formula Na 3 X. Ca will react with X to form. a. CaX 2 b. CaX c. Ca 2 X 3 d. Ca 3 X 2 e. Ca 3 X 9/16

10 36. What is the coefficient of M when the following equation is completed and balanced if M is an alkali metal? M (s) + H 2 O (l) a. 1 b. 2 c. 3 d. 4 e Which alkaline earth metal will not react with liquid water or with steam? a. Be b. Mg c. Ca d. Ba e. They all react with liquid water and with steam. ANSWER: A 38. Oxides of the active metals combine with acid to form. a. hydrogen gas b. metal hydrides c. water and a salt d. oxygen gas e. metal hydroxides 39. Oxides of most nonmetals combine with base to form. a. hydrogen gas b. an acid c. a base d. water e. water and a salt 40. The reaction of a metal with a nonmetal produces a(n). a. base b. salt 10/16

11 c. acid d. oxide e. hydroxide 41. Which nonmetal exists as a diatomic solid? a. bromine b. antimony c. phosphorus d. iodine e. boron 42. Which periodic table group contains only nonmetals? a. 8A b. 2A c. 6A d. 7A e. 5A ANSWER: A 43. Of the halogens, which are gases at room temperature and atmospheric pressure? a. fluorine, bromine, and iodine b. fluorine, chlorine, and bromine c. fluorine, chlorine, bromine, and iodine d. fluorine, chlorine, and iodine e. fluorine and chlorine 44. Which element would be expected to have chemical and physical properties closest to those of fluorine? a. S b. Fe c. Ne d. O e. Cl /16

12 45. Screening of the nuclear charge by core electrons in atoms is. a. less efficient than that by valence electrons b. more efficient than that by valence electrons c. essentially identical to that by valence electrons d. responsible for a general decrease in atomic radius going down a group e. both essentially identical to that by valence electrons and responsible for a general decrease in atomic radius going down a group 46. Which one of the following elements has the largest atomic radius? a. Se b. As c. S d. Sb e. Te 47. Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)? a. O < F < S < Mg < Ba b. F < O < S < Mg < Ba c. F < O < S < Ba < Mg d. O < F < S < Ba < Mg e. F < S < O < Mg < Ba 48. Which of the following is an isoelectronic series? a. B 5, Si 4, As 3, Te 2 b. F, Cl, Br, I c. S, Cl, Ar, K d. Si 2, P 2, S 2, Cl 2 e. O 2, F, Ne, Na Which isoelectronic series is correctly arranged in order of increasing radius? a. K + < Ca 2+ < Ar < Cl b. Cl < Ar < K + < Ca 2+ c. Ca 2+ < Ar < K + < Cl d. Ca 2+ < K + < Ar < Cl 12/16

13 e. Ca 2+ < K + < Cl < Ar 50. Of the following atoms, which has the largest first ionization energy? a. Br b. O c. C d. P e. I 51. Which of the following has the largest second ionization energy? a. Ca b. K c. Ga d. Ge e. Se 52. Which equation correctly represents the first ionization of aluminum? a. Al (g) Al (g) + e b. Al (g) Al (g) + e c. Al (g) + e Al (g) d. Al (g) Al + (g) + e e. Al + (g) + e Al (g) 53. Which of the following correctly represents the second ionization of aluminum? a. Al + (g) + e Al (g) b. Al (g) Al + (g) + e c. Al (g) + e Al 2 (g) d. Al + (g) + e Al 2+ (g) e. Al + (g) Al 2+ (g) + e /16

14 54. Consider the following electron configurations to answer the questions that follow: (i) 1s 2 2s 2 2p 6 3s 1 (ii) 1s 2 2s 2 2p 6 3s 2 (iii) 1s 2 2s 2 2p 6 3s 2 3p 1 (iv) 1s 2 2s 2 2p 6 3s 2 3p 4 (v) 1s 2 2s 2 2p 6 3s 2 3p 5 The electron configuration belonging to the atom with the highest second ionization energy is. a. (i) b. (ii) c. (iii) d. (iv) e. (v) ANSWER: A 55. The acidity of carbonated water is due to the. a. presence of sulfur b. reaction of CO 2 and H 2 O c. addition of acid d. nonmetal oxides e. none of the above 56. Which one of the following is not true about the alkali metals? a. They are low density solids at room temperature. b. They all readily form ions with a +1 charge. c. They all have 2 electrons in their valence shells. d. They are very reactive elements. e. They have the lowest first ionization energies of the elements. 57. Consider the general valence electron configuration of ns 2 np 5 and the following statements: (i) Elements with this electron configuration are expected to form 1 anions. (ii) Elements with this electron configuration are expected to have large positive electron affinities. (iii) Elements with this electron configuration are nonmetals. (iv) Elements with this electron configuration form acidic oxides. Which statements are true? a. (i) and (ii) 14/16

15 b. (i), (ii), and (iii) c. (ii) and (iii) d. (i), (iii,) and (iv) e. All statements are true. 58. Element M reacts with oxygen to form an oxide with the formula MO. When MO is dissolved in water, the resulting solution is basic. Element M could be. a. Na b. Ba c. S d. N e. C 59. Hydrogen is unique among the elements because. 1. It is not really a member of any particular group. 2. Its electron is not at all shielded from its nucleus. 3. It is the lightest element. 4. It is the only element to exist at room temperature as a diatomic gas. 5. It exhibits some chemical properties similar to those of groups 1A and 7A. a. 1, 2, 3, 5 b. 1, 2, 3, 4, 5 c. 1, 4, 5 d. 3, 4 e. 2, 3, 4, 5 ANSWER: A 60. Ozone is a (an) of oxygen. a. isotope b. allotrope c. precursor d. peroxide e. free radical Short Answer 61. You will have the following: 15/16

16 A. Write an electron configuration for an element and its ion. Determine diamagnetism or paramagnetism. Determine the energy in kj/mol of a substance being given its frequency or wavelength. B. You will use modern atomic theory and periodicity to explain trends in atomic radii and ionization energies. C. You will be given information in order to write a net ionic equation with phases and answer related questions... Solid lithium nitride is added to water. What would be the effect on ph paper held over the vessel? Magnesium is heated in dry air. Write two equations that represent possible reactions. Sodium hydride is mixed with water. Write the chemical equation for one of the product s spontaneous ignition in air. RESPONSE: ANSWER: C. Li 3 N(s) + 3 H 2 O(l) 3 Li 1+ (aq) + 3 OH 1- (aq) + NH 3 (g) ph paper held over the vessel would indicate that a basic gas, ammonia, is liberated from the solution 2 Mg(s) + O 2 (g) 2 MgO(s) and 3 Mg(s) + N 2 (g) Mg 3 N 2 (s) Retake Test NaH (s) + H 2 O(l) Na 1+ (aq) + OH 1- (aq) +H 2 (g) 2 H 2 (g) + O 2 (g) 2 H 2 O(g or l) POINTS: / /16