C4HW1 5th - View Attempt 5 of 5 Title: C4HW1 Started:...

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Unformatted text preview: View Attempt 5 of 5 Title: C4HW1 Started: September 25. 2010 4:51 PM Submwtted: September 25. 2010 5:43 PM Time spent: 00:51:30 TOIBI SCOPE: 11/12 : 51.666706: Tutal scare adjusted by 0.0 Maxwmum posswble score: 12 Done 1. What are the major specwes in sulutiun when sohd ammomum mtritews disso‘ved in water? Student Response Currect Answer A. NHS, NOB' 5‘ NH4+, HNOB’ 0 NHS, N02' D NH4+, Noz' E1 NHAJ’, N03' Scare: 1/1 2. How many tute‘ males at lens are re‘eased when the fu‘luwmg samp‘e dweeulvee cump‘ete‘y In water? 2.33 mm K2504 Student Response Correct Answer Answer: 6.99 6.99 Scare: 1/1 3. Conswder a 1.001 sn‘utmn cantammg 85.5 g m2(504)3 (FW : 342.15) and 21.3 g Nazso4 (RN: 142%) What are the mmar concentratlnns of aluminum, sodwum, and su‘fate Inns, respectwve‘y? [my]. [Na‘rL [5042*] Student Response Correct Answer 0 25 0 15 0 40 D 50 D 75 D 15 D 50 D 75 0 90 0 50 n 30 0 90 a 90?”? E.025 030 015 Scare: 1f1 4. A salutien is to be prepared With a sodium inn cancentratiun of U 671 mol/L what mass of sedium sulfate (9) is needed to prepare 2 DD liters M such a snlutinn? Do not enter unite with your answer Student Response Correct Answer Answer: 95 3 95.3 Scare: 1f1 5. which M the feliewmg is a CORRECF statement? Student Response correct Answer A. Hydrufluori: acid i5 3 Strong acid. B. The strength nf an acid or base refers tn ItE relative concentration. C. The equivaience point in an acidrbase titration occurs when the Voiumes of the acid and base are equivaient. D. Acid-baEe reactiohe iead tn the direct fUl'mEtiOfi at a precipitate E. Acetic acid is a weak acid E Scare: 1f1 6. What volume of a 0.100 M eniution of HCI is required tn neutralize a enlutinn prepared by dissoiving 10.0 g of KDH in 250 mi nF H20? Student Response Correct Answer A. 0.178 L B. 0.25 L C. 0.71 L D. 1.75 L m E. 179 L Scare: Ufl 7. The net ionic equatiun fur the reactiun between aqueouE Sr(OH)2 and FeSO4 Euiutiuns i5 Student Response Correct Answer A- Sr2+(aq) + sofifiq) a 5604(5) 5- Fe2+(aq) + 20H'(aq) A Fe(DH)2(5) c. F32+(aq) + SO42'(aq) — FeSO4(S) E. none of these Scare: 1f1 8. which of the ful‘uwwng Eubstencee \5 nut eomble in water? Student Response Correct Answer A. HCI B. sz a c. NaNO3 D. CuClz E. KOH Scare: 1f1 9. What IS the uxwdatlun number of H In mu‘eculer hydrogen (H2)? Student Response Correct Answer A. *1 E. +1 C. +2 D. -Z E. n m Scare: Ill 10. In the reectmn Clztaq) + 211%) a 2C1-(Qq) + 12(aqL the uxwdizwng agent is Student Response correct Answer ii A C12. a B‘ 1’. 0 Cl’. D. 12. E. H20. Scare: Ill 11. A 1.45 g samp‘e of an Iran are I5 dweenlved In acwd and the Mn obtained I5 FE“ (an). Tn tItrate the emutmn, 21.5 mL of 0.102 M KMnOdaq) I5 requwred. What Is the percent at Imn \n the ore? Hmt: ca‘w‘ete mu‘e5 uf \ron then ma55 of \ron then “In \ron. 5Fei+ + MnOg; + BH+4 5Fe3+ + Mn2+ + 41-120 Student Response correct Answer A 57.6% a B. 42.4% E C. 84.8% D. 8.5% E. 51.5% Score: 1/1 12. Ba‘ance the Mummy equation whwch the sme‘leet set at cnefflclente: _Iz(s) + _N328203(aq) => _Ne25405(aq) + _NaI(aq) Student Response Correct Answer A. 212(5) + 2N325203(aq) :> NazsADE(aq) + 2NaI(aq) s. 212(5) + ZNEZSZD3(aq) :> N325405(aq) + 4Nal(aq) c. 212(5) + 4Ne2S203(aq) => 2N32S405(aq) + 2Nel(aq) D. 12(3) + 2N325203(aq) => NHZS4OE(aq) + 2NaI(aq) E E. None of these Score: 1/1 ...
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C4HW1 5th - View Attempt 5 of 5 Title: C4HW1 Started:...

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