ExamIFormC2008KEY

ExamIFormC2008KEY - Exam I Form C KEY CH101 Bigham Spring...

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Exam I Form C KEY Name : __________________,_______________ print last print first CH101 Bigham Spring 2008 unity ID __________________ (ex jlsmith2) 1. (6 pts) What is the energy (J) of the 656 nm red line in the hydrogen emission spectrum? c = λν E = h ν= hc = (6.62x10 -34 Js) * (3x10 8 m/s)/(656x10 -9 m) = 3.03x10 -19 J ___________J 2. ( 6 pts) According to Rydberg, what is the frequency (s -1 ) of the n = 4 to n = 2 emission in the hydrogen atom? ν = 3.29x10 15 s -1 (1/2 2 – 1/4 2 ) = 3.29x10 15 s -1 (3/16) = 6.17x10 14 s -1 _____________s -1 3. (7 pts) According to the Bohr model, what is the energy (J) of an electron that has principle quantum number = 2 in a hydrogen atom? E = -2.18x10 -18 (Z 2 /n 2 ) J = -2.18x10 -18 (1/4) J = -5.45x10 -19 J Energy ____________________J 4. (6 pts) Use the Noble gas abbreviations to give the electron configurations of the following elements Na [Ne] 3s 1 Cr [Ar] 4s 1 3d 5 I [Kr] 5s 2 4d 10 5p 5
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2 2 3 3 2 -2 +2 +2 +1 +2 -1 +2 -2 +3 +2 a) b) c) d) e) 5. (6 pts) When 2 mol of Na 2 SO 4 is added to 6 mol of carbon and allowed to react according to the following equation: Na 2 SO 4 + 4C b Na 2 S + 4CO a. What is the limiting reactant? ____
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ExamIFormC2008KEY - Exam I Form C KEY CH101 Bigham Spring...

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