Study Guide for Exam - General Chemistry I | C 150, Study notes of Chemistry

Download Study Guide for Exam - General Chemistry I | C 150 and more Study notes Chemistry in PDF only on Docsity! South Carolina State University Name: Department of Biological and Physical Sciences C 150, Hamidi, Study Guide Chapter 5 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following has a negative charge? a. nucleus b. neutron c. proton d. electron e. alpha particle ____ 2. Which statement is false? a. Ordinary chemical reactions do not involve changes in nuclei. b. Atomic nuclei are very dense. c. Nuclei are positively charged. d. Electrons contribute only little to the mass of an atom. e. The nucleus occupies nearly all the volume of an atom. ____ 3. The atomic number of an element gives the number of __________ and __________ in the atom while the mass number gives the total number of __________ and __________. a. neutrons, protons; neutrons, electrons b. neutrons, electrons; protons, electrons c. neutrons, electrons; neutrons, protons d. protons, electrons; neutrons, electrons e. protons, electrons; neutrons, protons ____ 4. The atomic number of a certain element is 19, and its atomic weight is 39. An atom of the element contains __________ protons, __________ neutrons, and the chemical symbol for the element is __________. a. 19, 19, F b. 19, 20, F c. 19, 20, K d. 20, 19, K e. none of these ____ 5. Which pair of species has the most nearly identical properties? a. b. c. d. e. ____ 6. Give the number of protons, neutrons, and electrons of the 128Te2- anion. a. 52 p, 76 n, 52 e b. 52 p, 128 n, 52 e c. 76 p, 52 n, 52 e d. 52 p, 128 n, 54 e e. 52 p, 76 n, 54 e ____ 7. What is the symbol for a species composed of 38 protons, 52 neutrons, and 36 electrons? a. 90Kr2+ b. 90Sr2+ c. 90Sr d. 52Kr e. 38Th2+ ____ 8. What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.00%), and one with mass = 65.32 amu? a. 65.16 amu b. 64.37 amu c. 64.96 amu d. 65.04 amu e. 64.80 amu ____ 9. A hypothetical element consists of four isotopes having the following percentage natural abundance and isotopic masses. What is its atomic weight? isotope 1: 16.06% (52.100 amu); isotope 2: 28.36% (53.097 amu); isotope 3: 42.60% (54.093 amu); isotope 4: 12.98% (55.090 amu). a. 53.182 amu b. 53.262 amu c. 53.314 amu d. 53.487 amu e. 53.620 amu ____ 10. A hypothetical element has an atomic weight of 48.68 amu. It consists of three isotopes having masses of 47.00 amu, 48.00 amu, and 49.00 amu. The lightest-weight isotope has a natural abundance of 10.0%. What is the percent abundance of the heaviest isotope? a. 66.0% b. 12.0% c. 18.0% d. 72.0% e. 78.0% ____ 11. The atomic weight of antimony is 121.76 amu. There are two naturally occurring isotopes of antimony. 121Sb has an isotopic mass of 120.9038 amu and has a natural abundance of 57.40%. What is the isotopic mass of the other isotope, 123Sb? a. 122.4 amu b. 122.9 amu c. 122.2 amu d. 123.2 amu e. 123.1 amu Ch. 5 Values Some of the following values may be useful for solving some of the following problems. speed of light = 3.00 × 108 m/s1 joule = 1 kg•m2/s2 Planck's constant = 6.63 × 10-34 J•s1 Ångstrom = 1 × 10-10 m ____ 12. Refer to Ch. 5 Values. What is the frequency of light having a wavelength of 4.50 × 10-6 cm? a. 2.84 × 10-12 s-1 b. 2.1 × 104 s-1 c. 4.29 × 1014 s-1 d. 1.06 × 1022 s-1 e. 6.67 × 1015 s-1 b. c. pz d. dxy e. fz ____ 27. Which element has the electron configuration below? 1s22s22p63s23p63d104s24p3 a. V b. Ca c. P d. As e. Se ____ 28. Which of the following is the electron configuration of P in its ground state? a. 1s21p62s22p6 b. 1s22s22p33p33d4 c. 1s22s22p33s23p2 d. 1s22s22p63s23p3 e. 1s22s22p43s23p4 ____ 29. Which one of the following electron configurations is incorrect? a. 9F 1s22s22p5 b. 12Mg [Ne]3s2 c. 17Cl [Ne] 3s23p5 d. 6C [He]2s22p4 e. 19K 1s22s22p63s23p64s1 ____ 30. Which element has the following electron configuration? 1s 2s 2p 3s 3p a. Na b. Mg c. Cl d. Br e. P ____ 31. What is the electron configuration of oxygen, O? 1s 2s 3s a. b. c. d. e. ____ 32. If the following set of quantum numbers represents the "last" electron added to complete the ground state electron configuration of an element according to the Aufbau Principle, which one of the following could be the symbol for the element? n = 3, l = 1, ml = 0, ms = ± a. Na b. V c. Zn d. Si e. Th ____ 33. How many unpaired electrons are there in a neutral iodine atom (element 53)? a. one b. two c. three d. four e. five ____ 34. Which one of the following elements is paramagnetic in its ground state? a. He b. Se c. Kr d. Hg e. Mg ____ 35. The number of electrons present in the s orbitals in the outermost electron shell of the alkaline earth (Group IIA) metals is __________. a. one b. two c. three d. four e. five ____ 36. An element has the following outer electron configuration in its ground state, where n represents the highest occupied energy level: (n - 1)d10ns2np4. Which of the elements listed below could it be? a. Si b. S c. Se d. Ge e. none of these