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exam2key2010sp0001 - \A Name Kg(f 1 0 all 2009 Ned 28 Oct...

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Unformatted text preview: \A Name Kg (f - 1 0 . all 2009 Ned 28 Oct 09 MW 6:30 —— 8:45 pm See 4075/4076 ' G. Strathearn Instructions: 1. There are 100 points in this exam, with Wxam pages andmfions, including the extra credit problem. Check to make sure you have all the pages. You also have three pages of scratch paper, tables and charts, which you may remove. 2. Put your name or initials on each sheet. Make it readable! 3. For each question below, provide an answer. a. For multiple choice questions, place the correct letter in the space to the left of the answer. Ifyou feel more than one answer is correct, put the best answer. b. For all others provide an answer in the space provided. Ifyour answer can't be easily read, it won't be graded — and gets no points! 4. No cheating. You may have only a dictionary, writing instruments, an eraser and your own calculator. No other help or talking. You have 120 minutes. If you finish early, you may go. 5. Please raise your hand with questions - or come to the front of the room. Some conversions and formulas 18°C = (°F—32) °C = K-273 ’l” = 25.4 mm 1 mi=1.609km lmin=60 sec 60min=1 hr 1 Cal=1000cal lcal=4.18 J lkWh= 3.60 x1061 1m: 2.54 cm 1 yd = 0.9144 111 D = m/V 1 lb (pound) = 0.4536 kg 1 lb = 16 oz 1 mi = 5280 ft Density water = 1.0000 g/mL Specific Heats water gas = 2.02 J/gOK, liquid 4.18 Jig-K and solid 2.06 J/goK A. Multiple Choice Questions (10 at 5 points each or 50 points total). 1 ; l. The ionic compound formed by ammonium ions and phosphate ions has the formula: a. AlPO3 b. NH4PO4 C. (NH4)3PO4 d. (NH4)3P03 e. (NH4)3(P03)2 2. The correct name for the SCN'1 ion is: a) sulfanide b) thiocyanide c) thiocyanate d) sulfocyanide e) cyanosulfide a) Ti(Cr0)2 d) SnCrzO-l b) TiCrOz e) Sn(II)CrO4 C) Sn(CrO4)2 4. When the follo g reaction is balanced, what is the coefficient of the HCl? PCls 32:20 —> 14131304 +5HCi a) 1 b)2 c)3d)4g e)5t)6'g)7§>i( E 3. Which is the correct formula for tin(II)dichromate? , Predict the product(s) for the following reaction: NaN03 (aq) + HCl (aq) ~> a. NaCl (s) + HN03 (aq) b. NaCl (3) + HN03 (s) c. NaH (aq) + C1N03 (s) d. Na(HN03)2 + C12 (g) No reaction The type of reaction in which electrons are changed between a metal and a cation with the metal becoming a cation and the cation becoming a metal is a reaction: a) Single b) Combustion c) Decomposition (1) Double e) Combination Classify the following reaction: NaOH (aq) + HCIO4 (aq) —> NaClO4 (aq) + H20 (1) (balanced) Combustion Double replacement Single replacement Synthesis (combination) Decomposition 09.09“.» How many calcium (Ca, Z = 20, mass = 40.1 g/mol) atoms are in 0.392 moles of calcium? a. 2.72 atoms d. 0.046 atoms b. 2.36 x 1023 atoms 6. 6.94 x 1023 atoms c. 1.11 x 108 atoms In K2804 the percentage composition of K is: (1molK=39.lg,1molS =32.1g, 1 mol 0 =16 g, 1 molKZSO4= 174 g) a. 57 % d. 99% b 44.9% e. 1 8.4% c Depends upon the chemical bonds. 'K’Vt/Dfe' What volume does 3 22 x 1023 fructose molecules have if the density of sucrose is 1 85 g/cm3 and the molar mass of fi’uctose IS 180.0 g/mol? 3.13 cm3 b. 16.2 cm3 . 52.0 cm3 d. 97.3 cm3 6. 1070 cm3 [ZZZX/Ozfile/(rwkz)/_____ /’m/ ”‘02 /]/____ /CM} 6,011X/0lfl/o (tn/l mo/ //5- I; III at” D 1 El! Short answer. Provide an answer to each question below. Work Required for Credit (50 points total) 1 1. Your good friend (who you want to keep) comes to you and asks for your help. She has two fertilizers from the store and wants to know which is the most cost efficient as a nitrogen source. Determine from the data below (make sure you show the percent composition of the nitrogen) (10 points): a) NH4N03 at $2.20/kg b) N2H4CO at $1.76 per pound wk, N03 Mm, c 0 A/ 14:12? 9/7,” . V .. 35¢; lg. 1/ gfl/wg’vzz Lil/5;," 7 :zJX/ODZ"9Z72 joy/6:}!!- [CK/L4/5 V0 /0.X/¢ i... @0- d 1/, IIéfitrf), 47 MW {72%; "W“: ' iW/W/ .w ,,L_:_ 24,1? 7.? IL _,_._.-_-_ ,2 T/ia—EWXI/c/ A») W . M M” f ‘m/ Most cost efiicrent fertilizer = nil mafia/>5 M w QM 1.2/64) [é/l/ 12‘ Terephthalic acid has a molar mass of 166 amu. Its percentage composition is 57‘. 83% C, 3.64% H and 38.52% 0. What is its molecular formula? (5 pts) /éé/ I ma, 05-7,sz 75.7w {too #3973) 6.0% 4,00 0 5W?) awn 4.00 Formula of terephttTlic acid: Cf / ‘_ 13. For each of the items in the table, give either the chemical formula, the chemical name and then calculate the correct weight (formula or molecular) for those with boxes (21 points). Given Molar mass 1 ' 3, ams/mole “u“. CO 15,0 (“Molly/WWW 4‘ minim carélflz‘e /§/ mercurjlr) MAN/79ft 5' 3 . Co(C2H302)2 005“ H— (11:) a ce ‘5 /‘—€« Hypochlorous acid , #C/ 0 Rubidium “phosphate K 5% [00" Cupric fluoride CU, F‘ 7/ Dichlorine heptoxide > C I 2. 0; Acetic acid /_7/ C 2.. H] 02’ Bromic ac1d H gr 03 Cobalt(II)chloride deh drate CO OIL ' 8 fill/0 Sodium ulf te decal—hydrsatea ”42,th ' /0#L0 14. For each of the following reactions whether the reaction will occur and, if it does, complete the reaction and balance. If no reaction, put “NR” after the arrow. For those chemical shown by their names conv rt to chemical formula. See charts, last page. (14 pts) k \TV ,g x (n) [:3 \ a) Iron hydroxide (aq) + sodium carbonate (aq) ——> l Ira/(Wat ”47,60; ~a [fie/(033)1- ZA/abh‘ (VA b) Tin metal (3) + hydrochloric acid (aq) ——> 5m +14%! *—> fnC/Lt #47; c) Hydrobromic acid (aq) and potassium sulfite (aq) —> .2 H/fr-r KliD; z) ,Z/(BV 7‘//L0+ JUL, d) 0111902 (1) + oxygen (g) ——> 7/ Cat/7907;)? )~ 4 /¢C0L+//h£7,0 M e) Ba(OH)2(aq)+ H2804 (aq) 9 gdffly (j) I" Z 512,0 \ 2m c. f) Iron metal (5) hair nitrate (aq) —-) W @ Extra Credit (8 points possible) A mad chemist has an explosion in his lab when he knocks over some chemical bottles. In the morning, upon " examining his lab, he finds an unknown chemical compound and surrounding it a lot of dead rats and mice. / Realizing that he has made a sure-fire rat/mouse attractant/poison, he sees $$$$$ dancing in front of his eyes. He collects his sample from the floor. Because most of his lab is destroyed, he has few ways to examine / the compound. He finds the density of the new substance to be 1.72 g/cm3. Using pH paper, he finds it to be an acid. He burns 22.0 g of the compound in excess oxygen and collects the gases. He gets 57.1 g gases with the following breakdown: 18. EC, 28.3 g (30; and 10.3 g N02. What is the pounds empii®rmula7 (D ”57 I750 X 73’7 12.05éj#// "’ Z059/215‘23 7,09, Me M? ' r zm/coz x ggfiflflc/L; hwy/2437 :2 1?; 7”,; 9/4 :L— :- /é /0.?/e//0L)c fi9ié/]%M/V 3 ”IZZI7/ZL77 I IZ'Z'O’W 710:7/Ofi/é3fll géfi/ZZI7 $1,577; 5// ...
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