30.Which of the followingcombinations of quantum numbersis impossible? (a)n=1, l = 0, ml= 0, ms= 1/2(b)n=2, l = 1, ml= -1, ms= -1/2(c)n=2, l = 0, ml= 1, ms= -1/2(d)n=3, l = 2, ml= -2, ms= 1/2Answer __________ 31. Which is the correct groundstate electron configuration for theneutral Ca atom? Answer _________ 32. The first four ionization energiesof an element are 1.49 x 10-18J,2.92 x 10-18J, 2.5 x 10-17J, 3.5 x 10-17 J. To which group of the periodictable does the element belong? 17 33. What is the formula ofmanganese (IV) oxide? Answer _________ 34. How many oxygen atoms arethere in 27.04 grams of calciumphosphate? (a) 3.535 x 1023atoms(b) 4.201 x 1023atoms(c) 4.518 x 1023atoms(d) 5.663 x 10 23 atoms Answer _________
35. An iron ore called magnetitecontains only iron and oxygen. Inrefining 100.0 grams of the ore,72.25 grams of iron were obtained.What is the empirical formula of theore? Answer _________(For 2 bonus points, what is oddabout this compound?)Answer ________________________ 36. Assuming that the density ofwater is 1.00 g/mL, what is themolar concentration of pure water? 36. Assuming that the density of 37. In the dilution of 100.0 mL of a0.10 M solution of HCl to a finalvolume of 200.0 mL, what remainsunchanged? Answer _________ 38. Balance the redox reactionshown below.aKClO3+ bHBr cBr2+ dKCl + eH2O (a) a=1; b=3; c=1; d=3; e=3(b) a=1; b=3; c=3; d=1; e=3(c) a=1; b=6; c=3; d=1; e=3(d) a=1; b=6; c=1; d=3; e=3Answer _________39. Identify the reducing agent andthe oxidizing agent in the abovereaction. Answer _________
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