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Download Dr. Harris Chemistry 105 Practice Exam 1 Isotope Atomic Number
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Dr. Harris Chemistry 105 Practice Exam 1 1. Fill in the table below. Include ionic charges Isotope Atomic Number Neutrons Mass Number Electrons 122 54 51 48 4+ 22ππ 117 ππ‘ 74 2. Name the following a) SO3 b) WO3 c) Pt(CO3)2 d. HCl e. TeH2 f. Hg2SO3 3. What is the electron configuration of the 2nd excited state of S? 4. Using the Pauli Exclusion Principle, explain why an s-orbital can hold a maximum of 2 electrons? 5. Balance the following: C6H14 (l) + O2 (g) CO2 (g) + H2O (g) 6. Answer the following. a.) Using electron configurations, show the formation of MgO. b.) Why does this reaction proceed? (3) c.) Refer to the table of ionization energies in Ch 4 of your book, as well as the table of electron affinities shown on the right. Assume the radii of Mg2+ and O2- to be 130 pm and 200 pm, respectively. Calculate the energy change associated with the formation of MgO . 7. Which ion has the largest radius? a) Pt4+ b) Ir6+ c) O2d) Sn2+ 8. The number of protons in an atom determines its: a) reactivity b) chemical identity c) solubility d) phase 9. Which of the following sets of quantum numbers does NOT represent a possible ground state electron of Zr: a) 5, 0, 0, ½ b) 5, 1, 1, ½ c) 4, 0, 0, - ½ d) 2, 1, -1, - ½ e) 3, 2, -2, ½ 10. Explain how and why atoms emit light. 11. Why does the Bohr model fail for atoms with more than one electron? 12. A certain element, X, has 3 isotopes (49X, 50X, and 51X). The isotope masses are 49.122 amu, 50.456 amu, and 51.246 amu. Analysis confirms that 3.00% of all X is 51X. Given that the average mass of X is 50.000, determine the percent abundances of the other isotopes. 13. A sphere of gold has a diameter of 3 inches. Given that the mass of this sphere is 4469 g, calculate the density of gold in g/cm3 to the correct number of significant figures. 14. A laser emits 200mJ of energy per hour. Given that the wavelength of the photons in the beam is 300 nm, and assuming that the emission rate is constant, how many photons are emitted per minute? 15. A photon with some energy Ep strikes a metal surface. An electron is ejected with a velocity of 5.00 Mm/s. The threshold frequency of the metal is 6.30 x 1013 s-1. What is the wavelength of the photon, in nm? Significant figures count. 16. What is an orbital? 17. Why do atoms exhibit discontinuous (line) spectra when they emit light? Why canβt an atom emit any wavelength of light? 18. Refer to the activity series in chapter 10. For the single replacement reactions below, write the half reactions. Label the reducing and oxidizing agents. Show the net ionic equation. If no reaction occurs, write βno reactionβ. a.) Titanium (IV) perchlorate (aq) + Lithium (s) ο b.) Magnesium (s) + Sulfuric acid (aq) ο c.) Aluminum nitrate (aq) + Potassium (s) ο 19. Provide an acceptable set of quantum numbers for a valence electron on a Boron atom. 20. If you have not done so, answer the BONUS question on your last quiz. Equations πΈπ = πβπ£ π£π = π π = πππ π /π£πππ’ππ πΈπ = πΈπβππ‘ππ β πΈπ‘βπππ βπππ = βπ£π β βπ£π πΉππ ππ πππππ‘ππ ππ πππ‘πππ: πΈπ = Μ Μ Μ 2Μ ππ π 2 h = 6.626 x 10-34 Js c = 3 x 108 ms-1 me = 9.109 x 10-31 kg Volume of a sphere = πΈπ = π π1 π2 π 4 ππ 3 3 where r is the radius where k = 231 aJβ’pm, d = nuclear separation distance, Q = charge Conversions: 1 in = 2.54 cm