Fall 2000 Exam Key

Fall 2000 Exam Key - Key FILL IN THE BLANKS: l. (3 points)...

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Unformatted text preview: Key FILL IN THE BLANKS: l. (3 points) Write the names for the following acids: HI 141%0/g0 may/c 4gb HClO WP HC2H302 &2 Z a g I 2. (2 points) Write the formulas for the following acids: sulfurous acid 3 5 0fi ________ carbonic acid ( _ _ 3. (8 points) Classify each of the following compounds as 1) an acid, base, salt, or molecular compound and 2) as a weak electrolyte, strong electrolyte, or nonelectrolyte. Compound Acid, Base, Salt, or Weak, Strong, or Molecular Compound Non- Electrolyte CsOH 7 572—0 0 «f7 H3PO4 QC ID Qeg. & 2:? fig“ "V‘ *‘M 322% 4. (3 points) For each of the following situations, indicate whether the selected variable will increase, decrease, or remain constant for thgfiflescribed change. / / / A constant amount and temperature, " what ill happen to the pressure/6f a gas if the V0 me is decreased; " / / At constant a cunt/and pressure, what will happen the volume if the temperatureKdecr sed? I nstant amount an volume, what I happen to the pre ure if the temperature is increased? MULTIPLE CHOICE QUESTIONS: 1. How many grams of oxygen atoms are in 65 g of C2H202 (molar mass = 58.04)? a) 9.0 g b) 18g MflL (94A. EKG/WK c) 29g d) 36g 2. What is the mass percentage of carbon in dimethylsulfoxide, CzHGSO? a) 60.0 % b) 30.7% Na-(t- d/vx, 6<W c) 20.6 % d) 7.74 % 3. Determine the molecular formula of a compound that contains 40.0 % C, 6.71 % H, and 53.29 % O and has a molecular mass of 60.05. a) CH20 7:, b) C2H402 fl/a M W e) C31160 " d) C6H08 4. What is the molarity of CH3OH in a solution prepared by dissolving 11.7 g of CH30H (molar mass = 32.05) in sufficient water to prepare 230 mL of solution? 23313233912“ “'75 —_-.- 0.3650140/ c) 1.59M 31$;me 0. 230 L 1: §?M d) 11.9M 5. How many grams of H3PO4 (molar mass = 98.00) are in 175 mL of a 3.5 M solution of H3PO4? a) 0.61 g b) 4.9g __ 3 IL 5163.5‘MQK )EQQQQE _ 0 nil-13m?" ’75” Momk IL MW ":5 3; 15 1?. 6. How many moles of Br‘ are present in 0.500 L of 0.300 M AlBr3? a) 0.0500 mol b) 0.150 mol 0) 0.167 mol 0.450 mol 7. ‘N\$j‘5’\ The addition of water to an aqueous solution will result in a [M2805 onlume and a I 0 % concentration. @higher, lower b) higher, higher 0) lower, lower (1) lower, higher What is the molarity of an aqueous solution of methanol if 0.600 L of water is added to 0.200 L of a 2.00 M methanol solution? 0. @963 k [425 -t~ onok :: angOk a) 0.200 M V, New \M (W b 0.400 M \) ': b M‘ ‘ Mt " d) 0.800M (Locum 100g :: M$<03200§ An aqueous solution of an unknown solute is tested with litmus paper and found to be basic. The solution is weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could be the unknown? a. Na2804 ~ V )0 Kb HCZH302 S 6 MW 10 Q Ch NM 2 2%; wave w (5 ‘ 6L : wax/4, EM—Q 10. For a substance to be considered a strong electrolyte, it must ll. 12. 13. g be an ionic compound. a: issociate virtually completely to its ions in solution. c) be highly soluble in water. (1) be composed of both metal and nonmetals. ' Which of the following ionic compounds will form three ions after dissociation in aqueous solution? 21) NaOH 7.. ’ + 2__ NaClOz 1 CD @ Nazcm MW; ——5 210a. i: :5 d) Na3PO4 q ’ In the following reaction, which reactant is acting as a base? . ¥w 4w: HSO4]— + H20 —> H2804 + [OH]* a) [Hson- d— b) H20 A) W ZKM 0) H2804 d) [0H]— Which one of the following cannot act as a driving force for a metathesis reaction? 4 a) formation of an insoluble compound b) formation of a gas 0) formation of a nonelectrolyte @formation of a soluble, strong electrolyte 14. The formation of which one of the following compounds will act as the driving force for a metathesis reaction? C2H302 19% C) 3 $5? 15. When KOH and HN03 are mixed, a metathesis reaction occurs. What are the spectator ions in the metathesis reaction? KOH+HNO3 —> [+20 + KDGB a) K’Aand H+ __ I x b H+andOH_ / '1‘ w)? H10 Ii. @ K__ . H 'and NO; Nd‘ (ova: 9H,} Q [47,0 16. Which one of the following compounds is insoluble in water? a) AgC2H302 b) K2804 C) FC(NO3)3 @ ZnS 17. When aqueous solutions of Li2C03 and CaClz are mixed, a metathesis reaction occurs. What is the balanced net ionic equation for the reaction? Li2C03 + CaClg —> CQCO3LS) +lLl'Ci a) Li2CO3 + CaClz —> 2 LiCl + CaCO3 b) 2Li+ + (3033' —> Li2C03 ‘~ 1- 2+ c) 2Li+ + 2Cl' —> 2LiC1 @ C03 4- Ce; (£13038er / Ca3+ + (3032' —> CaCO3 Spec Sf e C @*@ 5 We'll. (ca/(C ACTIVITY SERIES OF METALS Calcium Sodium Manganese Zinc Chromium Iron Tin Lead Pb —> 13132+ + 2 e— Copper Cu —> Cu2+ + 2 6— Silver Ag —) Ag" + e— Mercury Hg —> Hg2+ + 2 e‘ Gold Au —> Au3+ + 3 e" 18. Based on the above portion of the activity series, which of the reactions will occur? MRS) + Mnl2<aq) —> ZnI2(aq) + Milo) ; fichmq) + Cu“) —) Sn(s) + CUC12(aq) AgNO3(aq) + 1313(5) -—) 2Ag(s) + Pb(NO3)2(aq) Hg(1) + 2 CI(NO3)3(aq) —’ 3 Hg(NO3)2(aq) + 2 Cr(s) 19. Based on the above portion of the activity series, which of the following elements is least easily oxidized? a) A b) Na 0) Fe (1) Ca ...
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This note was uploaded on 11/11/2009 for the course CHEM 1341 taught by Professor Compton during the Spring '08 term at Texas State.

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Fall 2000 Exam Key - Key FILL IN THE BLANKS: l. (3 points)...

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