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Qz1Key - CHM 2046 QUIZ 1(E53 50 MINUTE TIME LIMIT T 919103...

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Unformatted text preview: CHM 2046 QUIZ 1 (E53 50 MINUTE TIME LIMIT T: 919103 DIRECTIONS: Except for multiple choice, each of the following Q's is to be answered using grammatically acceptable English and/or complete math setups with correct units (U) and significant figures (SF). Note that No setup = fl credit! Now, if you 'Ve read and understand these directions, write the formula for magnesium nitrate after your name (below) and earn two points. (0 values are in the left macgin.) Name (pledged): ' 1136+— DiSC Instr: E) has )0 “>6 (#01..— 1. The conjugate base 0 [AI(OH2)3(0H)3] is (10) (1)[A|(0H2)4(0H)2]' (2)[Al(0H2)2(0H)4]@AI(0H2)2(0H)41' (4)[ml'DI'I2)4(‘3'H)2]+ (5)[N(0H2)4(0H)21- 2. If [HO'] for an aqueous soln increases by a factor of 50, pH for the soln (10) (1) goes up 1.30 .oes up 1.70 (3) goes down 2.30 (4) goes down 1.50 (5) goes up 2.10. 3. For [l2]liquid Ai[l2]water, K‘fist = 70.0. Thus, if 0.5009 [2 is shaken in a mixture of 10.0 mL liquid A and a volume of water, and four times more I2 dissolves in liquid A, the volume of the water is closest to (10) (1) 30.0 mL .175 mL (3)230 mL (4) 35.0 mL (5)315 mL. 4. If N2(g) + 3 H2(g) # 2 H3N(g) is to be studied in a 1.0 L flask at a Tfor which Kc = 10, and 0.050 mols of each gas is introduced into the flask, the quantity of N2(g) resulting at EQ will be closest to (Hint: Solving this requires no actual algebra!) (10) (1) 0.11 mols (2) 0.042 mols (3) 0.0095 mols @064 mols (5) 0.095 mols. 5. Kb(B') corresponds to: (1 ) B'(aq) + H30+(aq) 11* HB(aq) + H20“) (2) HB(aq) + H20(I) .——~ H30+(aq) + B‘(aq) (10) @(atfl + H20(a€1)= HB(aCI) + H0—(I) (4) Iii-(8(1) + HA(a€l) # HB(aCI) + Nil) (5) Ka(HB)in- 6. If BlL NB chemistry is studied in pure liquid hydroxylamine, HZNOHU), as solvent, the strongest BlL base which can be present at high concentration in this solvent is (10) (1) H3NOH” (2) 1010* @12010' (4) HO' (5) HZNOH. 7. The following compound which cannot be made as a pure substance is (10) 4110003 12) [Fe10H2)51215003 (a) Hean 14) [AlionuFa 15) HOC'Oa- 8. Write the K expression for: CaCO3(s) + H4N+(aq) 5* Ca2+(aq) + HOCOflaq) + H3N(aq). {10) if: 830(02):] £53”? Cit-1W] 9. Write the correct eqn(s) for the principal BlL NB rxn(s) which occur in each of the following. And tell if the rxn extent is large or small. (a) 5 mL of 1 M H4NHS is added to 2 mL of 2 M (HO)2302 (H2804). (Two eqns.) "[3 afiat} '9' (“they ”'3 ”Jfltfj‘i' ”an”? '1; “043%; 4!— HJZ‘J "‘3' Magi-‘9 50:31:33.6; (b) 8 drops of pure nitric acid, H0N02(I), is mixed with 1 mL of 0.2 M KHSO4. (One eqn.) (6) we. in 4- me u? —> 113035: + ”0%an 33 (c) 7 mL of 0.1 M H4NHSO4 is mixed with 3 mL of 0.5 M NaHCO3_ (Two eqns.) an «r “ i! "' ’ l (12) ”IGLIJQZJ 4' 3013 “09 «3'- szl; “0’ 4- J’Vézazly (height-[r4 J01 “"4 -7 “If.” f. 'i' ”0031'.“ ,3; “HLCfléldqi '1' (”3 3m (0‘14! £911.15th) Wind) 7 mL okamed with 9 mL of 0.2 M KHC03 giving amand bubbling. (A: (One equation.) 0. 05—” r—‘Hfi—v—J u j a" 36 t‘ w (a) Mid’iisigtqi 4. 3 mg: (,3, 4—1» Alimlflmiam + 3 mg: [Law H.019) 10. Explain why the mixture considered in 9.d., above, produces observable bubbling. . , 1A :4 . J‘Uxaa v: 1} WW efflameb W HLLLL; “ALL “2) misty 014mm» and 24.012) .y cam) watchman mime. ed. 44 We me it“, MWMMR' swam 11. Write the equation for the principal BlL AlB EQ which exists in 0.1 M H4NAc. (Hint: Note that this EQ is established by rxn between the strongest BlL acid present in high concentration and the strongest BIL base present in high concentration.) Then tell if this system is likely mildly acidic, mildly basic, or perhaps neutral. Defend your response. [0% Net‘s-55 iii/$2119 as. Wiggly? #3N(1)§>M.m<i. (15) ~WmJwae " «aw-‘Nj: 536 X if” (12) «((457 2 M 2-. 1331513: SWXIJLO .'~A~JM~;-”f-'*’7‘4 _ 144W l.9xw”5’#;u in. =73}. +5....» (4,»: man: CHM 2040 QUIZ 1 1‘15 _, 50 MINUTE TIME LIMIT T: 9l9l08 DIRECTIONS. Except for multiple choice, each of the following 0' s is to be answered using grammatically acceptable English and/or complete math setups with correct units (U) and significant figures (SF). Note that No setup= N_0 credit! Now, if you 've read and understand these directions write the formula for ammonium h dro ensulfate after our name below and earn two oints Q values are in the left ma in. Name (pledged) jégmd— lo... DISC Instr ”Kin Maggi 1. The following compound which c_a_nnot be made as a pure substance :5 (10) (1)HenHS (ZHAllOHzlalFa (31HOCI03 .‘thoa (5IIFeIOHZISIZIsoa3- 2. Kb(B') corresponds to: (1) HB(aq)+ H20(l)=H30+(aq) + B'(aq) (2) B'(aq) + HA(aq)#HB(aq) +A'(|) (10) @1an + Hzoque HBIan + H0'(|) (4) K.IHB)IK., (5) B'laq} + H301an e HBlaq) + H200). 3. If BlL AlB chemistry' Is studied' In pure liquid hydroxylamine, H2N0H(I), as solvent, the strongest BlL base which c_annot be present at high concentration' In this solvent' :3 (10) (1) HZNO' (2) HO‘ (3) HZNOH (4)H3N0H E (5) QNOH'. 4. Theconjugate base of [A|(0H2)3(OH)3] is (10) @IlOszl‘OHM' (2)[A|(0H2)4(0H)2] (3)[A|(0H2)4(0Hl2]' (4)[AI(OH2)4(OH)2]+ (5) [NtOHzlleth- 5. For [l2]liquid AI[|2]water, Kdist = 70.0. Thus, if 0.500g I2 is shaken in a mixture of 10.0 mL liquid A and a volume of water, and four times more I2 dissolves in liquid A, the volume of the water is closest to (10) (1) 35.0 mL @75 mL (3)315 mL (4) 80.0 mL (5) 230 mL. lf [H0] for an aqueous soln increases by a factor of 50, pH for the soln (10) ( )g 5 up 1.70 (2) goes up 1.30 (3) goes down 1.50 (4) goes down 2.30 (5) goes up 2.10. 7. If N2(g) + 3 H2(g) we 2 H3N(g) is to be studied in a 1.0 L flask at a Tier which Kc = 10, and 0.050 mols of each gas is introduced into the flask, the quantity of N2(g) resulting at E0 will be closest to (Hint: Solving this requires no actual algebra!) (10) (1) 0.095 mols (2) 0.042 mols (3) 64 mols (4) 0.0095 mols (5) 0.11 mols. __ __-__-—-_-—-.....-—_ _-_--_--_ _----___-_______—- --—-—----—~-—-_.--__ _-____ __-____ ____-___ _____ __-__ -......... -___—-. --------------------------------- 8. Write the K expression for: CaCO3(s) + H4N*(aq) = Ca2+(aq) + H0002'(aq) + H3N(aq). (10) M W WW 9. Write the correct eqn(s) for the principal BlL AlB rxn(s) which occur in each of the following. And tell if the rxn extent is large or small. (a) 5 mL of 1 M H4NHS is added to 2 mL of 2 M (H0)ZSO2 (H2804). (Two eqns.) (12) (b) 8 drops of pure nitric acid, HON02(I), is mixed with 1 ml. of 0.2 M KHSO4. (One eqn.) (6) (c) 7 mL of 0.1 M H4NHSO4 is mixed with 3 mL of 0.5 M NaHCO3_ (Two eqns.) (12) O. 04) (d) 7 mL of 0.5 AI(N03)3 is mixed with 9 mL of 0.2 M KHCO3 giving a white gel ppt and bubbling. (One equa ma.) (3) 10. Explain why the mixture considered in 9.d., above, produces observable bubbling. (12) 11. Write the equation for the principal BlL NB EQ which exists in 0.1 M H4NAc. (Hint: Note that this E0 is established by rxn between the strongest BlL acid present in high concentration and the strongest BlL base present in high concentration.) Then tell if this system is likely mildly acidic, mildly basic, or perhaps neutral. Defend your response. (15) CHM 2046 QUIZ 1 [9:5 0 MINUTE TIME LIMIT R: 919/08 DIRECTIONS: Except for multiple choice, ch of the following Q's is to be answered using grammatically acceptable English and/or complete math setups with correct units (U) and significant figures (SF). Note that No setup = fl credit! Now, if you've read and understand these directions, write the formula for potassium hydrogencarbonate after your name (below! and earn two points. (0 values are in the left margin.) Name (pledged): £51; (refit-mas“ DISC Instr: “Bee. Elbase 1. The conjugate base of [AI(lZJH2),,f(0H)2]+ is 610) (1)[N(0H2)4(0H) (2H (0H2)3(0H)3] (3)[A'(0H2)2(0H)4]_ (4)[)Ql'((:-“'i2)4(0l")2]+ (5)[AI(OH2)4(0H)2]. . 2. If [HO'] for an aqueous soln increases by a factor of 500, pH for the soln l “((10) (1) goes up 1.30 (2) goes up 3.70 (3) goes down 2.30 (4) goes down 2.50®oes up 2.70. 3. For [lzlnquid Al[l2]water, Kdist = 70.0. Thus, if 0.7509 l2 is shaken in a mixture of 20.0 mL liquid A and a volume of water, and four times more l2 dissolves in liquid A, thevolume of the water is closest to (10) (1)3011 mL (2)175 mL (3) 530 mL we mL (5) 225 mL. .wfifl k.) 4. if N2(g) + 3 H2(g) u-—* 2 H3N(g) is to be studied in a 1.0 L flask at a Tfor which K.3 =10, and 0.050 mols all of each gas is introduced into the flask, the quantity of N2(g) resulting at E0 will be closest to g '-, (Hint: Solving this requires no actual algebra!) a.) (10) (1) 0.042 mols (2) 0.11 mols (3) 0.0095 mols (4) 0.095 mols 364 mols. El g: 5. Ka(HB) corresponds to: (1) HB(aq) + H0"(aq)# H20“) + B‘(aq) (2) HB(aq) + A'(aq) ,. HA(aq) + B‘(I) (10) I3)B'(aq)+Hzolanv-HBIaqHH0'([email protected])+HZOIIIsH30*Iaq)+31an (SIKbIB'IIKw- 6. If BlL NB chemistry is studied in pure liquid hydroxyiamine, H2N0H(|), as solvent, the strongest BlL acid which can be present at high concentration in this solvent is (WOW (2) HzNO' (3) H3N0H22* (4) H30“ (5) HzNOH- 7. The following compound which can be made as a pure substance is ([email protected])2304 (2)[Fe(0H2)e]2Fs (3)(Hen):s (4llAl(0H2)e]2(003)3 (5)H4N0H- __________________________________________________________________________________________________________________________________________________ 8. Write the K expression for: CaCO3(s) + H4N+(aq) .—_- Ca2+(aq) + HOCOz‘(aq) + H3N(aq). (10) £56 «rye Wfléd 9. Write the correct eqn(s) for the principal BlL AlB rxn(s) which occur in each of the following. And tell if the rxn extent is large or small. (a) 5 mL of 1 M H4NHS is added to 2 mL of 2 M (H0)23Ci2 (H2804). (Two eqns.) (12) (b) 8 drops of pure nitric acid, H0N02(I), is mixed with 1 mL of 0.2 M KHSO4. (One eqn.) (5) (c) 7 mL of 0.1 M H4NHSO4 is mixed with 3 mL of 0.5 M NaHCO3_ (Two eqns.) (12) (d) 7 mL [email protected] Ai(NO3)3 is mixed with 9 mL of 0.2 M KH003 giving a white gel ppt and bubbling. One e uation. (8) ‘ q ’3»; Lyme iv 02051"! 10. Explain why the mixture considered in 9.d., above, produces observable bubbling. (12) 11. Write the equation for the principal BlL NB EQ which exists in 0.1 M H4NAc. (Hint: Note that this E0 is established by rxn between the strongest BlL acid present in high concentration and the strongest BlL base present in high concentration.) Then tell if this system is likely mildly acidic, mildly basic, or perhaps neutral. Defend your response. (15) CHM 2046 QUIZ 1 “'11; 50 MINUTE TIME LIMIT R: 919I08 DIRECTIONS: Except for muitipie choice, each of the foiiowing Q's is to be answered using grammatically acceptabie Engiish and/or compiete math setups with correct units (U) and significant figures (SF). Note that No setup = fl credit! Now, if you've read and understand these directions, write the formuia for ammonium ' hydrogensulfide after [our name [beiowg and earn two |goints. [Q vaiues are in the ieft margin.) Name (pledged): Tam Iflrfld‘ fir! DISC Instr; 'Bee-EI Q {Std 1. Ka(HB) corresponds to: (1) HB(aq) + A‘(aq) v- HA(aq) + B'(|) (2) HB(aq) + HO'(aq)-—* H200) + B'(aq) ([email protected](aq)+ H200) = H30*(aq) + B'iaq) (4) B'iaq) + HzoIaQI s HBtaq) + H01!) (5) K.(B‘)in- 2. If BiL NB chemistry is studied in pure liquid hydroxylamine, HZNOHU), as solvent, the strongest BiL acid which can be present at high concentration in this solvent is (10) (1) HZNO' (2) H30+ (3) HZNOH (4) H3NOH22+ ”@Noni 3. For [lflliquid Al[l2](,,,atm., Kdist = 70.0. Thus, if 0.7509 I2 is shaken in a mixture of 20.0 mL liquid A and a volume of water, and four times more I2 dissolves in liquid A, the volume of the water is closest to (10) (1)175 mL (2) 80.0 mL @0 mL (4)530 mL (5) 225 mL. 4. The following compound which can be made as a pure substance is I10) (1) (Hen)28 I2) H4N0H .4NI2504 I4) IFeIOHzIslea I5) [AIIOHzIslchosIs- 5. The conjugate base of [A|(OH2)4(0H)2]+ is (10) (1)[A|l0H2)4(0H)21+ (2) [A|(0H2)4(0H)2] (3) [AIIOHzIzIOHhr (4}[ANOH2)4([email protected](0H2)3(0H)3]- 6. If 0‘] for an aqueous soln increases by a factor of 500, pH for the soln (10) (1 es up 2.70 (2) goes up 1.30 (3) goes down 2.50 (4) goes down 2.30 (5) goes up 3.70. 7. If N2(g) + 3 H2(g) at 2 H3N(g) is to be studied in a 1.0 L flask at a Tfor which Kc = 10, and 0.050 mole of each gas is introduced into the flask, the quantity of N2(g) resulting at E0 will be closest to (Hint: Solving this requires no actual algebra!) (10) (1) 0.095 mols @14 mols (3) 0.042 mols (4) 0.0095 mols (5) 0.11 mols. 8. Write the K expression for: CaCO (s) + H4N+(aq) -—* Ca2+(aq) + HOCOflaq) + H Mag). 3 3 (10) See Wage? Wmd—r ( M96) 9. Write the correct eqn(s) for the principal BiL AiB rxn(s) which occur in each of the following. And tell if the rxn extent is large or small. (a) 5 mL of 1 M H4NHS is added to 2 mL of 2 M (H012802 (H2804). (Two eqns.) (12) (b) 8 drops of pure nitric acid, HON02(I), is mixed with 1 mL of 0.2 M KHSO4. (One eqn.) (6) (c) 7 mL of 0.1 M H4NHSO4 is mixed with 3 mL of 0.5 M NaHCO3‘ (Two eqns.) (12) (d) 7 mL of.1il.l(NCJ)3)3 is mixed with 9 mL of 0.2 M KHCO3 giving a white gel ppt and bubbling. (One equatiorIDA7 cl»: W13 31' “of” (3) 10. Explain why the mixture considered in 9.d., above, produces observable bubbling. (12) 11. Write the equation for the principal BiL NB EQ which exists in 0.1 M H4NAc. (Hint: Note that this E0 is established by rxn between the strongest BiL acid present in high concentration and the strongest BiL base present in high concentration.) Then tell if this system is likely mildly acidic, mildly basic, or perhaps neutral. Defend your response. (15} ...
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