ChemHMWK7 - Weinelt, Karl Homework 7 Due: Oct 28 2003,...

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Unformatted text preview: Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon This print-out should have 30 questions, check that it is complete. Multiple-choice questions may continue on the next column or page: find all choices before making your selection. The due time is Central time. This HW assignment is due Tuesday, October 28, by midnight. 001 (part 1 of 1) 10 points The Lewis dot structure for sulfur has 1. two pairs of electrons and two lone electrons. 2. two pairs of electrons and one lone electron. 3. three pairs of electrons and one lone electron. 4. three pairs of electrons. 7. 1 9. 4, 3, 3 003 (part 1 of 1) 10 points The correct Lewis electron dot representation for O is 1. O O O O O O O O 2. 3. 4. 5. 6. 5. one pair of electrons and three lone electrons. 002 (part 1 of 1) 10 points In most Lewis dot structures of neutral compounds, carbon as the central atom will be bound to a maximum of ? atoms, nitrogen will be bound to a maximum of ? atoms, and oxygen will be bound to a maximum of ? atoms. 1. 2, 3, 3 2. 3, 3, 2 3. 3, 2, 1 4. 4, 3, 2 5. 3, 2, 2 6. 4, 2, 2 7. 2, 2, 2 8. 5, 3, 2 8. 004 (part 1 of 1) 10 points Which property is characteristic of covalent, but not ionic compounds? 1. Aqueous solutions are good electrical conductors. 2. soluble in polar solvents such as water 3. insoluble in non-polar solvents 4. conductor of electricity in molten state 5. formed from elements of quite different electronegativities 6. solids with a high melting point 7. many are soluable in nonpolar solvents 005 (part 1 of 1) 10 points The Lewis dot formula for N2 shows ? . Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon 1. a triple bond 2. a double bond 1. methane, CH4 3. a single bond 2. magnesium chloride 4. a ionic bond 3. NaCl 006 (part 1 of 1) 10 points If an element has only 5 valence electrons it must be in group ? . 1. VA 2. IVA 3. IVB 4. VIIA 5. IIIA 6. VIA 007 (part 1 of 1) 10 points Which of the following is the best description of ionic bonding? 1. Bonding that occurs between elements with very different electronegativities, and with electron transfer. 2. Bonding that occurs between elements with very different electronegativities,and with electron sharing. 3. Bonding that occurs between elements with similar electronegativities, and with electron transfer. 4. Bonding that occurs between elements with similar electronegativities, and with electron sharing. 5. Bonding that occurs between ions and elements, and with electron sharing. 008 (part 1 of 1) 10 points 4. calcium oxide 5. KBr 2 Which of the following will not have ionic bonds? 009 (part 1 of 1) 10 points An element (call it X) in Group IA of the periodic table forms a compound with an element (call it Y) of Group VIA. The compound would most likely have the formula ? and would be ? . 1. XY2 , covalent 2. X2 Y, ionic 3. X2 Y, covalent 4. XY2 , ionic 5. XY6 , covalent 6. X6 Y, ionic 7. XY6 , ionic 010 (part 1 of 1) 10 points In the Lewis dot structure of the molecule ClF3 , how many unbonded electron pairs are found around the central atom? 1. 0 2. 3 3. 4 4. 2 5. 1 Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon 011 (part 1 of 1) 10 points What kind of carbon-carbon bond is in a molecule of acetylene (C2 H2 )? 1. triple 2. double 3 014 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for boron trifluoride (BF3 )? 1. F B 4. no pairs 5. two 6. three 7. twenty 5. 6. F F F B B F 013 (part 1 of 1) 10 points The Lewis dot structure of CO2- has ? 3 tal electrons and ? shared electrons: 1. 24, 8 to- 8. F B F ! ! 9. 3. 24, 6 4. 32, 8 F B F " " 6. 24, 10 " F " " " 5. 32, 6 " F " B " F " 10. " " ! F ! 2. 32, 10 F F 8. four F B F 7. F " #" 3. thirteen F 2. one 4. F B F 1. ten F 012 (part 1 of 1) 10 points How many unshared (non-bonded) pairs of electrons are in NF3 ? 3. F B F 4. single F F F B F 3. ionic 2. F F Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon 015 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for formaldehyde (CH2 O)? $ 4 016 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for carbon dioxide (CO2 )? 9 9 @@ B B E E I I T T c c f f pp rr HH b b WW X X ` ` ` ` 77 S S S S i i i i C C F F GG P P U U Y Y a a d d g g qq ss 2. 3. 6. ( O O O O O U U U U P P C C C C C V V V V Q Q O R R 4. H C H 0 7. 8. 9. 0 O O O O T T T T O H 11 6. H 2 2 C 2 H C 3 2 2 7. H 3 3 r r t t s s 6 H 6 6 6 8. H S H p p r r t t q q s s 6 H 6 C 6 O 6 6 6 10. 7. H S H h h p p q q 6 6 5 H 5 5 6 #6 5 6. 5 H S H h h f f g g 5 H 5 C O 5 5 5 9. 5. H S H c c f f e e f f d d g g 5 5 4 H 4 4 4 4. H S H c c e e e e a 8a d d 4 H 4 4 4 4 C 4 O 4 4 4 4 8. 3. H Y 8Y H 3 3 4 #4 2. 4 4 3 H a 8a S S Y 8Y Y 8Y 1 1 2 1 2 #2 1 ) ) 4 4 ) ) 5. H C 10. O 017 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for hydrogen sulfide (H2 S)? 1. H S H H H O R R O I I I I Q Q Q Q G 8G H O ( ( C H 5. O P P C O E E F F G 8G ' ' ( ' ' H H 4. O C O B B E E D D E E C C O C 3. ' ' O F F C O @ @ B B A A D D C C & & $ H $ $ $ 2. O C O @ @ A A 7 87 H $ $ $ $ C $ O $ $ $ 0 0 % % ) ) $ 1. 1. O C O 9 9 7 87 7 87 $ $ $ $ Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon 9. 10. 10. v v u u 5 018 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for nitrogen trichloride (NCl3 )? x x x 019 (part 1 of 1) 10 points How many unshared valence electrons are there on arsenic in the covalent compound AsF5 ? 1. two 1. Cl N Cl 6. Cl N 7. Cl N Cl Cl N # 8. Cl Cl 1. III and IV Cl 9. Cl Cl N Cl Cl Cl Cl Cl N Cl 5. Cl Cl N Cl 4. Cl # Cl N Cl 3. Cl # y y y y 2. Cl N 5. five 020 (part 1 of 1) 10 points In the following group of compounds, O3 , SO2 , SO3 , I- , CO2- 3 3 identify those that exhibit resonance. 1. All exhibit resonance 2. O3 , SO2 , SO3 , CO2- 3 3. SO2 , SO3 4. SO3 , I- , CO2- 3 3 5. CO2- 3 021 (part 1 of 1) 10 points Which of the following compounds are exceptions to the octet rule? I. CH4 II. PCl5 III. XeF2 IV. MgCl2 Cl x Cl 2. zero 3. three 4. eight 2. II and III 3. II, III and IV H S w w H v 8v Cl Cl N Cl H S w w u u H v 8v y y Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon 4. IV 5. III 022 (part 1 of 1) 10 points Which one of the following compounds does not obey the octet rule? 1. CH4 2. H2 O 3. BF3 4. NaCl 023 (part 1 of 1) 10 points Which of the following molecules is polar? 1. BF3 2. SO3 3. CH3 Br 4. CO2 5. BeF2 024 (part 1 of 1) 10 points Which one of the following is a nonpolar molecule with polar covalent bonds? 1. SOCl2 (S is the central atom) 2. H2 Te 3. BeBr2 4. HF 4. 5. NH3 5. 025 (part 1 of 1) 10 points On the usual Pauling scale of electronegativities, the electronegativity of Selenium (Se) is 2.4, while that of chlorine (Cl) is 3.0. 6 Based on these values we should expect the bonding between Se and Cl to be ? . 1. covalent and polar with the Cl end of the bond slightly negative 2. covalent and polar with the Se end of the bond slightly negative 3. ionic 4. unstable in any circumstances 5. covalent and nonpolar 026 (part 1 of 1) 10 points Interpret the dot formulas with M = magnesium and X = nitrogen. Which one is the best representation of the compound magnesium nitride? 1. M+,[ X ]2. 3. 4. M2+,2[ X ]- M2+,[ X ]2- 3M2+,2[ X ]3- 5. None is appropriate because magnesium nitride is a covalent compound. 6. 2M+,[ X ]2- 027 (part 1 of 1) 10 points Which figure is correct? 1. Na Na O 2. 3. Na+,[ O ]22Na+,[ O ]2- Na O Na Na2+,[ O ]2- 028 (part 1 of 1) 10 points Double bonds between two given elements are Weinelt, Karl Homework 7 Due: Oct 28 2003, midnight Inst: Donna Lyon ? and ? than single bonds between the same two elements. 1. weaker; shorter 2. weaker; longer 3. stronger; longer 4. stronger; shorter 029 (part 1 of 1) 10 points Which atom in the molecule N O is partially positive? 1. N 2. O 030 (part 1 of 1) 10 points In a molecule of nitrogen, N2 , the nitrogen atoms are bonded to each other by 1. a double covalent bond. 2. a triple covalent bond. 3. a single covalent bond. 4. an ionic bond. 7 ...
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This note was uploaded on 04/30/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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