CHEM 5, Spring 2016 EXAM 2 (Chp 3 & 4) Use the Scantron for Questions Mark only one answer unless instructed otherwise.
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1 CHEM 5, Spring 2016 EXAM 2 (Chp 3 & 4) NAME 115 pt Use the Scantron for Questions Mark only one answer unless instructed otherwise. CHP (Atomic structure and isotopes) ANSWERS FOR QUESTIONS 1 and 2: A) protons B) neutrons C) electrons D) nucleus E) atomic number AB) mass 1. What does the nucleus of an atom contain? Mark more than one answer. 2. Atoms are neutral because the number of equal the number of? Mark two answers. (14 pt) Fill in this table with the missing values, isotope formulas or names. Isotope name Isotope symbol Atomic number Mass number Protons Neutrons Electrons Charge (C)ation (A)nion (N)eutral 15 7 N CHP (Periodic Table) Mark the letters of the chemical symbol on your scantron that correspond to each of the following names. There are more symbols than names. ELEMENT NAME ELEMENT SYMBOLS 3. Manganese A. B AC. Ca CD. Nk 4. Copper B. Ba AD. Cd CE. M 5. Calcium C. Be AE. Co ABC. Ma 6. Nickel D. Bm BC. Cu ABD. Me 7. Beryllium E. Br BD. N ABE. Mg AB. C BE. Ni ACD. Mn (11 pt) Complete the following table. Name Symbol Metal (M) Nonmetal (N) Metalloid (D) Representative (R) or Transition (T) Element Period Number Group Number Zinc 2B F 2 D 3 4A 8. Which elements have similar properties according to periodic law and the table? Mark more than one answer. A) Manganese B) Copper C) Calcium D) Nickel E) Beryllium 39 pt
2 CHEM 160, Spring 2016 EXAM 2 (continued) Page 2 of 4 9. The alkaline earth metals are in which group of the periodic table? a) IA b) IIA c) VIA d) VIIA e) VIIIA ANSWERS FOR QUESTIONS 11 and 12: A) Hydrogen B) Helium C) Oxygen D) Nitrogen E) Carbon AB) Silicon AC) Aluminum 10. What is the most common element in the human body? 11. What is the most common element the air that we breathe? BONUS (2 pt) Someone who likes to start fires is an NAME THE ELEMENT CHP (Electron configurations) 12. Which of the following statements is/are correct? i. Principal energy levels are identified by the letters s, p, d,and f ii. Principal energy levels appear in both the quantum mechanical model of the atom and the Bohr model of the atom iii. In general, n = 1 is at lower energy than n = 2, and n = 2 is lower than n = 3, and so on iv. The principal energy level is related to electron spin A. i only B. iv only C. i and ii D. ii and iii E. iii and iv 13. What is the electron configuration for Br A. [Ar] 4s 2 4p 5 B. [Ar] 4s 2 4p 6 C. [Ar] 3d 10 4s 2 4p 5 D. [Ar] 3d 10 4s 2 4p Mark your scantron for the following elements or ions that have this electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 A) Ne B) Na + C) K + D) S E) P How many total electrons can fit into principal energy level 3? A) 2 B) 8 C) 18 D) In the third principal energy level, what is the order of energies of the sublevels, from lowest to highest? A) 1s < 2s < 3s B) 3d < 3p < 3s C) 3p < 3s < 3d D) 3p < 3d < 3s E) 3s < 3p < 3d 17. Which of the following pairs of atomic numbers belong to elements whose atoms have the highest occupied energy level electron configuration of the form ns 2 np 4? A) 16 and 52 B) 40 and 72 C) 24 and 42 D) 9 and 17 E) 14 and 32 (9 pts) Draw the orbital energy diagram for the ground state electron configuration of silicon. The orbital energy diagram for the ground state electron configuration of lithium is given as an example. EXAMPLE: Li (atomic number: 3 = 3 electrons) electron configuration: 1s 2 2s 1 1s 2s Increasing energy 27 pt
3 CHEM 160, Spring 2016 EXAM 2 (continued) Page 3 of 4 CHP 4 (Chemical bonding, chemical naming and chemical formula calculations) 18. Which of the following is true regarding an ion? (circle all that are correct) A) all ions have noble gas electron configuration B) an ion is an atom that has gained or lost electrons C) an ion is an atom that carries either a positive or negative charge D) salts are made up of ions (16 pt) Fill in the table with the missing names or symbols Name of compound or ion Formula HCl BrO 2 aluminum chloride magnesium hydride Cu 2+ iron (III) oxide Dinitrogen tetroxide S Which of the following is the best classification for a bond in which bonding electrons are shared equally? A. Nonpolar B. Polar covalent C. Primarily ionic D. Very strongly polar covalent E. Slightly ionic 20. Which of the following chemical bonds is best described as nonpolar covalent? A) H-H B) H-C C) H-N D) H-O E) H-F 21. The ratio of anions to cations in an ionic compound is always such that pt A. the compound is reduced in size when compared to the parent atoms B. there are as many anions as there are cations C. the anions outnumber the cations D. the cations outnumber the anions E. the compound is electrically neutral
4 CHEM 160, Spring 2016 EXAM 2 (continued) Page 4 of 4 Draw the Lewis structure for SO 2 and fill in the blanks in the table (18 pt total) Lewis structure (6 pt) Valence Electrons (2 pt) Electron group geometry (2 pt) Bond Angle (2 pt) Molecular geometry (2 pt) (2 pt) How many resonance structures are there? Polar (P) or Nonpolar (N) (2 pt) (12 pt) One of the pollutants from automobiles know as NOX was found to contain 17.3 g oxygen and 7.43 g nitrogen. What is the empirical formula for this compound. Show all work for complete credit. Grams Molar mass Moles Mole ratio Whole number mole ratio Oxygen Nitrogen THE EMPIRICAL FORMULA IS 30 pt
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