HW4 - Cheung, Anthony – Homework 4 – Due: Oct 5 2006,...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord This print-out should have 38 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points How many nodal planes and/or nodal cones are expected for 2s and 4f orbitals, respectively? 1. 0 and 4 2. 1 and 4 3. 0 and 3 4. 2 and 4 5. 1 and 3 002 (part 1 of 1) 10 points + The C cation has how many total electrons and how many valence electrons? 1. 6; 6 2. 6; 5 3. 5; 4 4. 7; 5 5. 6; 3 6. 6; 4 7. 7; 6 8. 7; 8 9. 5; 3 1. Al and F 003 (part 1 of 1) 10 points Write the electron-dot notation for the element Cl. 1 2. None of these ¢ £ ¤¤ ¥¥ § ¨ ¨ © © 3. Cl 4. Cl 5. Cl 6. Cl 7. Cl 8. Cl 9. Cl  © ©  ¨ ¨ ¨¨ ¦¦ ¥ ¦¦ £ ££ 004 (part 1 of 1) 10 points Which lattice energy is larger? 1. rubidium chloride 2. lithium chloride 005 (part 1 of 1) 10 points What is the formula for the simplest, stable compound formed from lithium and oxygen? 1. Li2 O 2. LiO 3. LiO2 4. Li2 O2 006 (part 1 of 1) 10 points Which of the following pairs of elements would be LEAST likely to form a compound by ionic bonding? 2. Na and S 3. Cs and O 4. C and N 1. Cl ¢¢ ¡ Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord 4. covalent. 5. Mg and Br 5. nonbonding. 007 (part 1 of 1) 10 points In reactions to form ionic compounds, nonmetals generally 1. lose electrons. 2. become metals. 3. do not react. 4. gain electrons. 008 (part 1 of 1) 10 points The phosphorous anion (P− ) has how many total electrons and how many valence electrons? 1. 15; 5 2. 16; 5 3. 14; 5 4. 16; 4 5. 14; 4 6. 15; 6 7. 15; 4 8. 14; 6 9. 16; 6 009 (part 1 of 1) 10 points The bonding in LiF is predominantly 1. ionic. 2. There is no predominant mode of bonding for this compound. 3. polar covalent. 2 010 (part 1 of 1) 10 points Which of the following species has bonds with the most ionic character? 1. PCl3 2. SiO2 3. P4 O10 4. NO2 5. CO2 011 (part 1 of 1) 10 points The chemical formula for potassium sulfate is 1. K2 SO4 2. K(SO4 )2 3. K3 (SO4 )2 4. KSO4 012 (part 1 of 1) 10 points Which M2+ (where M is a metal) ion is predicted to have the ground-state electron configuration of [Kr] 4d3 ? 1. Sn2+ 2. Co2+ 3. Nb2+ 4. Hg2+ 5. Fe2+ 6. Rh2+ 7. Mo2+ Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord 013 (part 1 of 1) 10 points Which of the following species has the greatest number of electrons? 1. O2− 2. Na 3. Be2+ 4. Li+ 5. F− 014 (part 1 of 1) 10 points Which of the following is the best representation of the compound calcium fluoride? 2−     3 (stronger, weaker) and (longer, shorter) than single bonds between the same two elements. 1. stronger; shorter 2. weaker; longer 3. stronger; longer 4. weaker; shorter 017 (part 1 of 1) 10 points How many unshared (non-bonded) pairs of electrons are in NF3 ? 1. four 2. one 3. three 4. two 1. Ca2+ , F    0 0 2− 4. None is appropriate because calcium fluoride is a covalent compound. − $ $ & & 5. Ca+ , F '' 2. also called alloys. 3. often composed of molecules. 4. very hard solids. 016 (part 1 of 1) 10 points Double bonds between two given elements are OO 8 OO O @@ 999 999 8 88 8 AA O AA @@ 6. O 9 O AA 9 @@ 9 9 5. 8 8 8 4. 77 3. 6 46 88 55 1. also called formula units. OO 66 6655 55 2. 3 OO 3 43 6 46 2 55 3 2 22 015 (part 1 of 1) 10 points Covalent compounds are 1. 3 43 22 ( F 11 ( 6. Ca2+ , 2 ) ) ## % % " " 3. 2 Ca , + F  F   2. 3 Ca2+ , 2 ! !     3− 5. thirteen 6. twenty 7. no pairs 8. ten 018 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for oxygen (O2 )? − Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord 7. 8. UU B CB 4 F 6. 2 7. 10 020 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for boron trifluoride (BF3 )? 1. F F F 021 (part 1 of 1) 10 points What kind of carbon-carbon bond is in a molecule of ethylene (C2 H4 )? 1. triple 2. ionic 3. single B F F F F B G GG FF G 4G GG 4. double F G F H F B I II HH II F B R RR II R 4R I PP F RR R RR R R 4R R P QP 5. F F PP II PP I I 4I 4. F I F II HH II HH H 4H 3. H H F HH B F H HH H G 4G 2. F G G 022 (part 1 of 1) 10 points The Lewis dot structure of CO2− has how 3 many total electrons and how many shared electrons? 1. 32; 6 2. 24; 6 3. 32; 10 4. 24; 10 5. 32; 8 dd dd F F dd cc bb 10. cb 5. 6 F B cc aa 4. None of these bb F aa YY cb aa X F X 4X X X X 3. 12 9. B ` F ` 2. 4 X 4X W `` Y ``Y WW W 1. 8 F WW W W 4W W W 4W 8. W W W F W B F W WW W W W 4W W 019 (part 1 of 1) 10 points How many unbonded pairs of electrons are in the Lewis structure for barium peroxide? F B VV VV VV VV VV FF EE OO D 7. F TT S F S 6. EE B F F UU OO B CB F 4F GG H 4H FF H D DD DD PP T UUT BB BB P 4P Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord C H y y 5 6. 24; 8 10. 023 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for acetylene (ethyne, C2 H2 )? e H C H H H H H H H H H H – 4– ™™ – 4– –– ”” ‘ 4‘ ”” ‘ ””  ‘ 4‘  ‘   …… … †† …… …  C C C C C C C C C C • ¡• • ¡• “ ¡“ ‘ 4‘ ˆ ¡ˆ † ¡† ˆ ¡ˆ †† ‚ ¡‚ N N N N ‰ „ ‡‡ „ ¡„ ‡ ¡‡ „ ¡„ ƒƒ € ¡€ 3. H i i C i C i 4. 5. H C p ii N N N N N N ˜˜ —— ““ “ ¡“ “ ¡“ ’’ ‰ ¡‰ 4. H p p C 6. p 7. r C H ss 7. H uu C C C C w w vv x H xx x xx 9. x H x C x C x ww H H xx ww 8. t H tt t H 025 (part 1 of 1) 10 points In constructing the Lewis dot formula for CCl− where carbon is the central atom, give 3 the quantities for N (needed electrons), A (available electrons) and S (shared electrons). 1. N = 32, A = 26, S = 6 2. N = 32, A = 24, S = 8 3. N = 32, A = 26, S = 8 4. N = 32, A = 25, S = 8 ˜˜ ™™ tt t t t ft 6. t H t C C t tt ss s t ht s q fq t ft q q 5. H C 8. 9. 10. ’’ H rr pp „ ‰ ‡ ¡‡ ‰ ¡‰ r g H gg i hi g gg 2. g H g C g C 2. 3. €€  1. g gg € ¡€ ‚ ¡‚  e H ee g hg e ee e e e fe 1. H e C C 024 (part 1 of 1) 10 points Which of the following is the correct Lewis formula for hydrogen cyanide (HCN)? e yy ee e fe q fq e t Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord 5. N = 32, A = 25, S = 6 6. N = 32, A = 24, S = 6 1. 2 026 (part 1 of 1) 10 points How many lone pairs are on the central atom of SF4 ? 1. 0 2. 1 3. 4 030 (part 1 of 1) 10 points 4. 2 5. 3 027 (part 1 of 1) 10 points When using the formula S = N − A in constructing the dot formula for H3 AsO4 , 1. N = 44, A = 32, and S = 12. 2. N = 44, A = 30, and S = 14. 3. N = 46, A = 32, and S = 14. 4. N = 46, A = 30, and S = 14. 5. N = 42, A = 30, and S = 12. 028 (part 1 of 1) 10 points Which of the following contains only one pair of valence electrons which are not involved in bonding? 1. H2 O 2. 4 2. Cl2 3. 1 3. N2 4. 5 4. F2 5. 2 5. NH3 032 (part 1 of 1) 10 points 2. 4 3. 3 4. 1 5. 5 6 029 (part 1 of 1) 10 points How many bonding electron pairs are in N2 H4 ? Assuming that all atoms obey the octet rule, how many lone pairs of electrons are in any one of the resonance structures of the guanadinium ion C(NH2 )+ ? 3 1. 2 2. 1 3. 5 4. 3 5. 4 6. 6 031 (part 1 of 1) 10 points How many resonance structures are there for the NO− polyatomic ion? 3 1. 3 Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord Which of the following has the lowest lattice energy? 1. KCl 2. LiCl 3. KI 4. KBr 5. NaCl 033 (part 1 of 1) 10 points For dinitrogen monoxide, the arrangement of the atoms is N-N-O. In the Lewis structure using only double bonds, what are the formal charges on N, N, and O, in order from left to right? 1. 0, +1, −1 2. −2, +1, +1 3. 0, −1, +1 4. 0, 0, 0 5. −1, +1, 0 034 (part 1 of 1) 0 points Which of the following does NOT exhibit resonance? 1. SO3 2. SO2− 3 3. All of the other answers have ions or molecules which exhibit resonance. 4. NO− 3 5. CO2− 3 035 (part 1 of 1) 10 points The Lewis formula ·· ·N · ·· 1− C O· · 7 represents one of the resonance forms of the cyanate ion. The formal charges on N, C and O, respectively, are 1. −2, 0, and +1. 2. 0, 0, and −1. 3. −2, +4, and −1. 4. −1, 0, and 0. 5. +2, 0, and −1. 036 (part 1 of 1) 10 points Estimate the heat released when ethene CH2 CH2 reacts with hydrogen to give CH3 CH3 . Bond enthalpies are C H : 412 kJ/mol; C C : 348 kJ/mol; C C : 612 kJ/mol; C Br : 276 kJ/mol; H H : 436 kJ/mol. 1. 342 kJ/mol 2. 148 kJ/mol 3. 288 kJ/mol 4. 124 kJ/mol 5. 560 kJ/mol 037 (part 1 of 1) 10 points Which of the following compounds has the most polar bonds? 1. H2 Te 2. H2 Se 3. H2 S 4. H2 O Cheung, Anthony – Homework 4 – Due: Oct 5 2006, midnight – Inst: McCord 038 (part 1 of 1) 10 points Consider a series of molecules in which carbon is bonded to second period elements: C O, C F, C N, and C C. Place these bonds in order of increasing polar (ionic) character. 1. C 2. C 3. C 4. C F, C C, C C, C O, C O, C N, C N, C N, C N, C O, C F, C F, C C F O C 8 ...
View Full Document

Ask a homework question - tutors are online