practice exam 2 solution_pdf

practice exam 2 solution_pdf - DrRuth says In all cases...

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DrRuth says: In all cases, select the answer that BEST answers the question asked. All questions on this sample exam are worth the same number of points. On the real exam, the harder/longer questions will be worth more points. Read the whole thing first and plan which to answer first because you feel confi- dent about them. Notice the hardest ones and save them till last so you don’t use up all your time working on them. Shear 52375 The table below lists electronegativity val- ues for the first six rows. The bottom row and the lanthanides and actinides list atomic weights. Just ignore them. 1 18 1A 8A 1 2 H 2 13 14 15 16 17 He 2.2 2A 3A 4A 5A 6A 7A 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 1.0 1.6 2.0 2.6 3.0 3.4 4.0 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 0.9 1.3 3B 4B 5B 6B 7B ———8B——— 1B 2B 1.6 1.9 2.2 2.6 3.2 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 0.8 1.0 1.4 1.5 1.6 1.7 1.6 1.8 1.9 1.9 1.9 1.7 1.8 2.0 2.2 2.6 3.0 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 0.8 1.0 1.2 1.3 1.6 2.2 1.9 2.3 2.2 2.2 1.9 1.7 1.8 2.0 2.1 2.1 2.7 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 0.8 0.9 1.0 1.3 1.5 2.4 1.9 2.2 2.2 2.3 2.5 2.0 2.0 2.3 2.0 2.0 2.2 87 88 89 104 105 106 107 108 109 110 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds (223) (226) (227) (261) (262) (266) (262) (277) (268) ( ) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.1 141.0 144.2 145.0 150.3 152.0 157.2 158.9 162.5 164.9 167.3 168.9 173.0 175.0 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.0 231.0 238.0 (237) (244) (243) (247) (247) (251) (252) (257) (258) (259) (260)
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reyes (mr29667) – Sample Exam Two – Shear – (52375) 2 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which one of the following formulas is wrong? 1. sodium sulfate : Na 2 SO 4 2. ammonium perchlorate : NH 4 ClO 3 cor- rect 3. sodium nitrate : NaNO 3 4. potassium chloride : KCl 5. calcium sulfate : CaSO 4 Explanation: The ammonium ion is NH + 4 ; the perchlor ate ion is derived from perchlor ic acid (HClO 4 ) and has the formula ClO 4 . One ClO 4 is needed to balance the charge on each NH + 4 , so the formula for ammonium perchlorate is NH 4 ClO 4 . The sodium ion is Na + ; the sulfate ion is SO 2 4 . Two Na + are needed to balance the charge on each SO 2 4 , so the formula for sodium sulfate is Na 2 SO 4 . The sodium ion is Na + ; the nitrate ion is NO 3 . One NO 3 is needed to balance the charge on each Na + , so the formula for sodium nitrate is NaNO 3 . The potassium ion is K + ; the chloride ion is Cl . One K + is needed to balance the charge on each Cl , so the formula for potassium chloride is KCl. The calcium ion is Ca 2+ ; the sulfate ion is SO 2 4 . One Ca 2+ is needed to balance the charge on each SO 2 4 , so the formula for calcium sulfate is CaSO 4 . 002 10.0 points Give the formula for sodium nitrate. 1. NaNO 3 correct 2. Na(NO) 3 3. Na(NO 3 ) 2 4. Na 3 NO 3 Explanation: The sodium ion is Na + ; the nitrate ion is NO 3 . One Na + is needed to balance the charge of each NO 3 , so the formula is NaNO 3 .
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