CHEN1211Fall07Test1

CHEN1211Fall07Test1 - (5 Points) Which of the following...

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Unformatted text preview: (5 Points) Which of the following properties is NOT an extensive property? a) Boilin Point (b) Length _ (c) Mass ‘9 (d) Volume (e) All of the above are extensive properties (8 Points) What is the mass of liquid water that occupies a volume equivalent to 4.46 moles of gas at STP? One mole of gas at STP occupies 22.4 liters and the density of liquid water at these conditions is assumed to be 1.00 gram / cm3. ' L l (M; l3\ (a) 100.kg V4; 5’ MM) ZZ.I+L [000M *3 (b) 22.4 kg "Ma L “‘1‘ ,6 " ‘ (c) 10.0 kg . P—j'o _._ 00. I( I 00 (d) 4.46 kg \vL / j j (e) 1.00 kg (5 Points) What would the symbol be for an atom that contained 9 protons, 10 neutrons and 10 electrons? (c) 190 l 19F 2 (e) 190 (5 Points) Which of the following statements is true? (a) Electrons and neutrons have an equivalent charge but the charges have the opposite sign. - . Neutrons an n u o . (c) Electrons have a mass that is significantly greater than either neutrons or protons. (d) Neutrons and protons have charges of the same sign. (e) None of the above statements is true. (8 Points) What is the average atomic mass of a new element Tv if 3 naturally occurring isotopes are found? These isotopes are 40Tv with an atomic mass of 40.0 g/mol and a relative abundance of 50%, 52Tv with an atomic mass of 52.1 g/mol and a relative abundance of 40%, and 60TV with an atomic mass of 60.0 g/mol and a relative abundance :10%I33.2 g/mol z (0' 50161003?) F@'@(SZ‘L%J @"9@" (b) 40.8mol : 95.89“ j/my/ (c) 46.8 g/ml (d) 50.0 g/mol (c) 54.2 g/mol (10 Points) 2.788 g of an organic compound containing only C, H, and O is completely combusted in 02. The reaction products are 5.630 g of C02 and 2.250 g of H20. What is the empirical formula of this compound? a? C M5 03 c: :. fi-éBgy '14 r. 0428’!“ 5. Wm? —~ 1557 5 C "’ 5"” (a) CZHZO (b) CHO (c) C2H402. Wm H :32?!) E5 [219/ - 0.250.116“?! (d) (321440 ’50 Msflfio ' (e) C3H30 501513 Pl M59320: 2133—1337-0137 : ayyfyo M305 0 :2 0’77? 311?: 0.062%mfl50 9. 7. (5 Points) The following combustion reaction for phenol (C6H60) is NOT balanced. If the stoichiometric coefficient of phenol is 1 in the balanced reaction, what is the stoichiometric coefficient of 023;; Unbalanced Reaction: C5H60 $2 93H20 +éCOzr —— .— .__-' I (a) 7.5 __,. a (b) 6 (c) 8. (e) 9 8. (8 Points) For the following reaction, there are 3 moles of A, 2 moles of B, 1 mole of C and 0.5 moles of D at the start of the reaction. Which of these reactants is the limiting reactant? Balanced Reaction: ' 4A + 2B + 3C + D —> products " 3 :— ( 75* (a) A ,4 , .4 0 , O O ’3' 3’- 1 ’ “Jaw r __ Mimi- \ (d) D @333 (3) None of these is limiting W D? 0 5 .; 0 « S0 /— O (8 Points) What is the molar concentration of sodium ions (Na+) in a solution of Na3PO4 made from 0.05 moles of Na3PO4 mixed with sufficient water to form 250 mL of solution? M "‘ 0' OS‘M j 0 , 20 (a) 010M 0'43 my) —— ______.—a __ A4 ' - 0. 25—0 L (b) 0.20 M :1 ‘ 60 (C) III“ a 3 0 M (Cl) 0.60 u (e) 1.00 M 10. (5 Points) What is the oxidation number of vanadium (V) in the V2074' ion? (a) +3 -. Z 4 l’ (b) +4 "Lac—L) : -/’-f 30 710 if“??? I“ % @V J V1 «ml-(9 #44”: oxro’ (d) +6 a; y/ 0 (e) +7 - 1, ac A t/ :5 *5 11. (10 Points) After the following unbalanced redox equation is balanced in basic solution using the smallest set of integer values, what are the coefficients in front of N03'(aq) and OH'(aq)? +527. ‘ c) ' 42—2 +7— -1 m __N03'<aq) + __Zn(s) + -_H20(1) —> _N0(g> + _Zn2*(aq) + _0H'(aq) ._ -' 2.. (a) 1, 4 {M03 +36 ———‘9 M0 3 X“ (b) 2,6 ¥m~n + 26"] )5 3 a [.2 m ———-7 (c) 2’ 2 A/ + 3 2 n 1 0 d 3, 4 " % -—-’> Z .. f (e) 2, 8 pp 0H" WWW 5"“ V "0 +3939 ‘/ _ Check 0% , lo :_ /§) 12. (8 Pomts) What IS the wavelen , n nanometers, assoc1ated w1th a 00.0 g golf ball moving at 30 m/s (about 67 mph)? (a) 2.2 x 102 nm ‘2 M05: 4' g-Zvl+‘f’120 ""> (b) 2.2 x 10'7 nm 24/0 +??H+2+‘80H ' (c) 2.2 x10'16nm D 1’1 _ 5, .63; xo‘a‘f 43 mZ/s -25 2':— W ‘ M 2.2x1§ mi. 7 M“ @kaj)[30m/S> (e) 2.2 x 10'34 nm 13. (10 Points) Excited rubidium atoms emit red light with ?L = 795 nm. What is the energy difference in kJ/mol between the electron orbitals that give rise to this light emission? C329 Levine/a M55119sz (a) 116 kamol (b) 124 kamol (0) 137r karnol (e) 169 kJ/mol l4. (5 Points) What is the ground-state electron configuration of tellurium? How many unpaired electrons are in this ground-state electron configuration? a) [Kr]4dl°5325" aired elec .- (b) [Ki‘]‘il~dl°55251::4 3 unpaired electrons (c) [Kr]5525p‘1 2 unpaired electrons (d) [Kr]5325p4 3 unpaired electrons (e) [Kr]4f”4d1°5525p4 2 unpaired electrons 15. What is the version of your exam? (a) Version A (13) Version B ...
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This note was uploaded on 05/01/2008 for the course CHEN 1211 taught by Professor Gin,doug during the Fall '08 term at Colorado.

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CHEN1211Fall07Test1 - (5 Points) Which of the following...

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