chem129 s02 test1A

chem129 s02 test1A - ‘ Chemistry 1 29 Test 1 A 29 April...

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Unformatted text preview: ‘ Chemistry 1 29 Test 1 A 29 April 2002 Name; _ 2 I _._ Seat Number ii Resources: you may use your calculator, the periodic table on the back page, and the equations on the back page of the test. A ‘- _wx- —m'- \ “l l l f Multiple Chelce U \ Fifteen questions, 4 points each 1, Se] t the strongest acid: é. HBrO4 ‘ C. HBrOz . HBr03 D. HBrO 2. Se] e strongest acid: . C103 C. H103 . HBI'03 3. Select the strongest acid: A. HCl @fl B. HF D. HBr 4. Select the strongest acid: A. CH4 9n dud C. H20 ‘0 -" I s‘. *? HF B NH; M Consider an aqueous solution of Nags. The solution is: A. neutral _ @asic B. .actdItS' ' N c t S * “av O > D. Indeterminate ' onsider an aqueous solution of KNOg. The solution is: neutral C. basic B. acidic \< N U x "i ii a, 0 *1 D. Indeterminate '4.— 7. Consider an aqueous solution of CH3NH3C1. The solution is: A neutral C. basic ' on H at MA 0 A _ _ B. acidic EN 3 ’ D. not enough information 8. Consider an aqueous solution of (NH4)2C204. The solution is: A. neutral C. basic B. acidic D. not enough information to determine 9. Consider the reaction NH3 + H20 ——) NI-L;+ + OH'. Ammonia is acting as a: A. Arrhenius, Bronsted-Lowry, Arrhenius and Lewis base ,. and Lewis base D. Arrhenius and Bronsted- / Bronsted-Lowry and Lewis Lowry base base 10. Which one of the combinations below is a buffer? \<-0 H * P“ M.“ in, quime/X/HCI W . KOH and A1(OH)3 )3.” Ca(C104)2 and H004 A flirt: and HF F H; n n (“no”). vgzo~)—\\CIO.{+[c--0H “€1fl59h ..-V>__1‘l§[-)'ltfjrcf KP 4-H; O _'> H" 11.?363sfi6f't56hfi5’othetical weak acid HA, which has pKa = 9. Imagine that we place in it a buffer with pH = 11. What form are most of the HA molecules in? - ‘l A. Not enough information C. H2A+ Yr 5* " *0 . n B. HA D. A‘ (W? ‘ i D 12. Consider a beaker of water saturated with PbSO4. We then add a gram of K2504. How does this affect the mass of Pb+2 ions in solution? " w“ A. It decreases (9V 50“ ‘ H 1‘0 C. It is unchanged B. It increases Y D. Unknown without Kip 13. Suppose we keep adding Mg(OH)2 to a beaker of water until large amount of precipatate forms. We then add a few drops of concentrated HCl. How does this addition affect the mass of Mg in the precipate‘? A. It decreases C. It is unchanged B. It increases D. Unknown without Ksp 14. Consider the following equilibrium. If Kf = '7.s><108 for 211mm)...” and K = 4.2x10'9 for Zn(CN)4'2, which way does equilibrium lie?/-""*as\ ' 4 CN‘ + Zn(NI-I3)4+2 <=> ham 2 + 4 NH3 ,‘ A: with products C. Indeterminate . with reactants 15. Consider the reaction HCI + H20 —--> H30+ + Cl“. HCl is acting as a: A. Arrhenius, Bronsted—Lowry, “* ." ' Arrhenius and Lewis acid and Lewis acid ‘ D. Arrhenius and Bronsted- Bronsted-Lowry and Lewis Lowry \ acid Problems Five problems of eight points each. Show all of your work. Write your answer in the answer box provided and include preper units for full credit. If you make a calculator error, but write the correct algebraic expression for the answer in the partial credit box, you will receive six points. 16. At room temperature, the K5,, of calcium phosphate is 1.0 x 10'26. Calculate the solubility of calcium phosphate in water. Alebraic ex ression: -1v \ x10 “(Qth —7 OH- + H2?‘?»l 17. Calculate the solubilith of Al(OH)3 in a solution buffered to pH 5. The KSP of aluminum hydroxide is 4.6 x 10' 3. A1 ebraic ex rcssion: AHDM '> M “OH — y. K 37‘ 31. £X)(S¥J 3 w .. a LWW ‘ EH 18. The pKa of HF is 3.17. Calculate the pH of a 0.05 M solution of HF in water. + — AlebraJc ex ressmn. 3 H5; “Agra :3 A F H“? r r ~W’13‘wm’ m we ° a 9' A “1' 4»! x )4 x 9Y6~=?\\7 kh' \D-‘lbxto 3,5Qtt0fg-lor'lbrl'0‘qk >)k 1 0 F9 "H 1, ’3/30H-(O ~Ka-7V3'F‘IO fl “'7‘ ’3 i '— . 0039“ ,1 k vs‘vw \O ’* [W] 7 2‘ Zko 9% 19. A buffer is prepared by mixing 5 moles of acetic acid with A moles NQOH. Cahulate {he pH of the buffer. Alebrajc ex ression‘. cugcoow~ Mo“ 7;: Mao . attack/U» w s L/ O O A vi ‘7‘ bx 1')‘ Q * 1‘ g— ¥ (by X X g“ lag-+916; ow?“ “w lbakl 9“; 9kg H110 m ' 20. Calculate the pH of a 0.4 M solution of potassium acetate. Ka = 1.8 X 10'5 for acetic acid. A] ebraic ex ression: Answer: 7 LL7ng 4, [W1 Ear] Data And Equations for acetic acid, Ka = 1.8 x 10'5 at 25 °c, Kw =10—M R = 0.08206 L'atm Incl-K R 28.314 I ' PERIODIC CHART OF THE ELEMENTS .NERT IA 11A IIIB IVB VB VIB VIIB VII! 13 118 um IVA VA VIA VIIA GASES H 1.00197 7 I 1.019? 1.0020 F 5.989 9.0122 10.811 12.0112 14.005? 15.994 10. 904 2 .1 fl 5 2291198 20.9815 28.080 30.9753 35.453 I I ' ' ' '. ' : 2 ' I ' V 40.00 44.958 47.90 50.942 51.990 54.9 30 5541' 50.932 I r 6.54 5.7 89.2 I 14.0218 711.96 29.909 mm 35.4? 312 88.905 91.22 92.906 95.94 {99} 12.905 10.4 101'. 11240 I 110.159 121.75 12.50 12.904 - r a 132.905 1911.34 130.91 173.40 100.940 IBSJS 106.2 19.2 192.2 195.09 198.05? 200. 294.3? 207.19 200.900 [210] : : : i, : I I - I I .' I l : I .- I [223] [220] [221‘] [262] [235] [271] [222] [21?] onnfombotm mama-sum. “Wmiapmsbmmus *Lanthanide Series _ mmbnrsol‘mognnbhnrml 5 5 ; '. ; ; ; :7 : ': . : i : E | E H H H" 140.12 140.90? 150.35 151.95 158.924 162. 0 164.930 157.211 183.834 113.04 174.97 COMIsloanomie Wclnhts. fAcl-jnlde Serbs ‘ I I I I I I' ! I .‘ I I : I I I I 00000000000 232.030 [2311 233.03 [24!] (241] [241] [249] [253] I (D to 00000 common HOW. Mania Wit: Danni-I10: TM wup design-lion: and ham Ill Irv-1mm Matron: 50M“ m“. ...
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chem129 s02 test1A - ‘ Chemistry 1 29 Test 1 A 29 April...

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