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☰ Search Explore Log in Create new account Upload × Houston Community College System Chemistry 1405 PRACTICE EXAM # 2 1 HOUSTON COMMUNITY COLLEGE CHEM 1405 Name: _____________________ Practice Exam # 2 (Chap. 4 - 7) PART I – Multiple choice: (3 points each) 1) Which is the subatomic particle having a negligible mass and a negative charge? A) electron B) neutron C) proton D) quark 2) What is the electron configuration for an atom of fluorine? A) 1s2 2s2 2p3 B) 1s2 2s2 2p5 3) How many neutrons are in the nucleus of an atom of A) 50 C) 1s2 2s2 2p6 3s1 118 50 D) 1s2 2s2 2p6 3s2 3p5 Sn ? B) 68 C) 118 D) 168 4) Given that the only naturally occurring isotope of sodium is 23Na, what is its isotopic mass? A) 11.00 amu B) 11.99 amu C) 12.00 amu D) 22.99 amu 5) What is the term for the minimum amount of energy to remove an electron from a neutral atom in the gaseous state? A) atomic energy B) electron energy C) ionization energy D) nuclear energy C) Br D) all of the above 6) Which of the following is a representative element? A) B B) Be 7) Which fourth period transition element has the highest atomic number? A) Ca B) Cd C) Kr D) Zn C) Sb and Te D) Po and At C) Ca D) none of the above 8) Which of the following elements are fourth period metalloids? A) Si and Ge B) Ge and As 9) Which of the following is an alkali metal? A) Al B) Fe 10) How many valence electrons does the representative element with the electron configuration 1s22s22p63s23p5 possess? A) 5 B) 6 11) The compound Au2Se3 is classified as which of the following? A) binary ionic B) ternary ionic C) 7 D) 2 C) binary molecular D) binary acid 12) Which of the following formulas for an ionic compound is incorrect as written? A) Ca(SO4)2 B) KOH C) MgS 2 D) NH 4Cl 13) Which of the following names is paired with an incorrect formula? A) Lithium bromide –LiBr B) Iron (III) chloride - FeCl3 C) Copper (II) oxide - Cu2O D) Cesium sulfide - Cs2S C) Iron (II) sulfate D) Iron (III) sulfide 14) The correct name for Fe2(SO4)3 is A) Iron (III) sulfate B) Iron (II) sulfide 15) Element X has two natural isotopes: X-6 (6.015 amu) and X-7 (7.016 amu). Calculate the atomic mass of element X given the abundance of X-7 is 92.5%. A) 6.09 amu B) 6.50 amu C) 6.52 amu D) 6.94 amu 16) Which of the following is not isoelectronic with a noble gas? A) Li 1+ B) Ba2+ C) S1D) F117) What is the name of a reaction in which two cations in different compounds exchange anions? A) combination B) decomposition C) double replacement D) neutralization 18) Which of the following is evidence for a chemical reaction? A) A gas is detected. B) A precipitate is formed. C) A flame is observed. D) all of the above 19) Which of the statements below best describes the following reaction? Na2CO3(s) Na2O(s) + CO2(g) A) Solid sodium carbonate is heated to give solid sodium oxide and carbon dioxide gas. B) Sodium carbonate decomposes to sodium oxide and carbon dioxide. C) Sodium carbonate decomposes to sodium oxide and carbon dioxide gas. D) Sodium carbonate is heated to give sodium oxide and carbon dioxide. 20) What is the coefficient of oxygen gas after balancing the following equation? A) 1 B) 2 ___P(s) + ___O2 (g) → ___P2O3(s) C) 3 3 D) 5 PART II – Show All Your Work: (8 points each) 1) What is the predicted product from the following reaction? Balance this equation. What kind of reaction is it? Barium chloride (aq) + Sodium sulfate(aq) 2) A) Which of the following metals does not react with aqueous Ni (NO3)2? Why? Partial Activity Series: Mg > Al > Ni > (H) >Cu B) Write the core electron configurations for the following: 1) O 2) Mg 3) What is the name of each compound? A) Ca(OH)2 B) KCl C) AlBr3 D) NaF 4) How many valence electrons do atoms with the following electron configurations have? A) 1s22s22p63s23p64s23d104p4 B) 1s22s22p63s2 C) 1s22s22p63s23p64s1 D) 1s22s22p6 5) Fill in the chart below for each of the following isotopes. Symbol 131 53I _____ 37 17Cl _____ Atomic # Mass # ______ _____ ______ ______ ______ 99 ______ ______ 43 43 ______ 26 #Protons #Neutrons _____ 17 56 ______ 20 ______ 4 #Electrons ______ 23 BONUS QUESTION – Show All Your Work: (10 points) The hypothetical element supposium exists in four isotopic forms. The relative masses and percentage isotopes are, respectively, 66.0 amu and 1.230% 67.0 amu and 9.800% 69.0 amu and 2.410% 70.0 amu and 86.56% abundances for these four Calculate the atomic mass of supposium. Answer Key Part I- Multiple Choice 1) A 8) B 15) D 2) B 9) D 16) C 3) B 10) C 17) C 4) D 11) A 18) D 5) C 12) A 19) A 6) D 13) C 20) C Part II- Show Your Work 1) Bacl2 (aq) + Na2 SO4 (aq) --> 2 NaCl (aq) + BaSO4 (s) Double-Replacement Reaction 2) A)Cu, because it is not as active as Ni B) 1) [He] 2s2 2p4 2) [Ne] 3s2 3) A) Calcium Hydroxide B) Potassium Chloride C) Aluminum Bromide D) Sodium Fluoride 4) A) 6 131 5) C) 1 D) 6 53 131 53 78 53 43Tc 43 99 43 56 43 37 17Cl 17 37 17 20 18 26 56 26 30 23 99 53I B) 2 56 +3 26Fe Bonus Question: 0.01230 66.0 amu 0.812 amu 0.09800 67.0 amu 6.57 amu 0.02410 69.0 amu 1.66 amu 0.8656 70.0 amu 60.59 amu 69.632 amu (calc) 69.63 amu (corr) 5 7) D 14) A Download 1. Science 2. Chemistry CHEM 1405 Practice Exam #2 (2015).doc Exam 2 - HCC Southwest College Chapter 5 Section 2 Unit Two: Worksheet 1 1305-Home-work-5.doc Key to Review Worksheet for Exam I Chem 101, Summer 2006 Atomic orbitals worksheet Document Section 3.5: Atomic Structure and the Periodic Table 4s 3d - Quia Atomic Structure II Valence Electrons studylib © 2017 DMCA Report