Chem200 Quiz1A f04 Liang

Chem200 Quiz1A f04 Liang - a ,y I CHEMISTRY 200 Name A I...

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Unformatted text preview: a ,y I CHEMISTRY 200 Name A I QUIZ 1A 45minu+as i FALL 2006 TA , _ Section NOTE: All numerical results must include the correct units and correct number of significant digits to be guaranteed full credit. Show your work on problems requiring calculations, and please use scientific notation when apprOpriate. 1. (2 pts.) Rewrite the following number using proper scientific notation: 0 O 62 / W 9/ _/ ,.l< r) (3 pts.) Calculate the volume in mL of cyanic acid (CHNO) that would have a mass of 28.0 g, if the density of cyanic acid is 1.140 g/crns. 3. (4 pts.) Give the number of protons, number of neutrons; and number of electrons in one atom of 25Mg2+. CHEM 200 Fall 2005 y - ., Quiz #3A, 20 points Name ‘ ' " ‘ Section 2” . . a v You have 35 min to complete this qmz. Please Show all work to receive credit for correct answers. 1. State the type of bonding, metallic, ionic, or covalent, you would expect in each of the following (2 pts): 3.) KBr Vii"? it: b)HCICZJYm1F/7* / 2. Identify the grou numher in the main group to which X belongs in the ionic compound ormula X203 (2 pts) r9 Air/l5 W) 3. For the following pair, circle the compound with the higher (in magnitude) lattice energy, and explain your choice (2 pts): if MC" ‘/ - . u w ~lthY Natl W a Margit mom: MW mm W} 4. Using the periodic table only, arrange the members of the following set in order of increasing bond length, from shortest to longeyn‘efly explain your reasoning (2 pts). Cl ‘Cl, BY‘BET‘I Br-Br, C1-C1, 1—1 bond ltngih mamm down a {)8me lab}? 5. Using the periodic table only, arrange the following elements in order of increasing EN (2 pts): t S, O, S :3"; i ‘ tifidfi / 6. Rank the members of the following compounds in order of decreasing ionicphgracter of their bonds (i.e.- from most polar to least polar bonds 7 2 pts): ASF3, AsBrg, AsC13 / I 3 2 * 7. Draw the Lewis structure of Cng: What are the formal charges on each atom (3 pts)? n?:¥‘.¥; ,r’?" ‘ “:0 ’\ \ him! {ll/1199 C l \, ' initial {‘lllllfig i“ f ' a H CM ’Y m (MS? to 8. Use bond energies and Table 9.2 to estimate the AHm1 for the following reaction (5 pts): / b 2CH4(g) + 02(g) a CH3CH20H(g) + H20(g) (Hint: You need to draw out the Lewis structures of the reactants and products first.) /O or, 0 1 I ‘ (’6 _,... 1 C 0’6 J’H’C-CW H'O H H 13‘ 68 50 l I 0' m0 2 I 19. *(Lilsx‘l) % g: I:— u: COP}? nonrhhhnnnn :::::§ 3': ’ Elzilaaiillilléslliliawzc I: c2c& “ggmvvczmrfi: -§gm= a»: g .. a F. 01' t - s r a g {gm-mint HM '“ M_m-_..a..::r'r"rr._ i :1: W 22 oflsflocoo zzzzzzzz a; a *(Lllsx‘j) uu IYtTJIH IEEIIIII 3 ~4— C“ ' oz -§r_5-euc~e: 'ggmcezz a. :- 3 H1107 ‘3 g. S" "-3 m4 see ssesseee assesses g 55% K .33.?— "s For“ saw-5111's 3322;; 1 llHHifl lllilil 551;;[;‘ gal: I f n7r~ “fiwguTSfi: i , if g m." 4:, t E -— h NfiwJI’H-DAUA E H20“L_b7x SEE fi§§§§§§ reassess E by”Ui-THDMWMMEM i I: -- no a: a (1 r“ *2: '11 '1'; '11 m a: (I: U; m m m L‘g“TTTl|§E Halli $35; a Murrow z l q H '51???- on.) own-— imldth-J g" é ejeaagasfi‘e eeaeae é -;_; ht. (7‘ . (5 pts.) Find the empirical formula of a compound that is 49.9% iron and 50.1% r silicon by mass. to 4592* «W 504% 1,501 \ . 4914‘? _A , 7Q £330? 22 #55859 " gfit 22”“ no mgr >((6 pts.) Calculate the maximum number of moles of H28 formed when 785 g of A1283 (molar mass = 149.96 g/mol) react with 5.50 moles of water, given the reaction: ’} 9' Al283(s) + engom —, 2A1(OH)3(S) + angsog). 3 H T m a ‘2 47 17805 5,530 New , ' / I mar/2m WMK%% Jr?“ M MD L’lmmA/L; WWGENJ— ...
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This homework help was uploaded on 02/15/2008 for the course CHEM 200 taught by Professor Beauvais during the Fall '06 term at UCSD.

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Chem200 Quiz1A f04 Liang - a ,y I CHEMISTRY 200 Name A I...

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