F03_E2A - Chemistry 111 Page 1 out of 6 Exam II / Fall 2003...

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Exam II / Fall 2003 Answer Key Make sure you show your work whenever a calculation is required in the space provided. Failure to do this will result in zero points being awarded. 1. How many orbitals are there in the entire eighth shell? 64 . (02 pts) 2. How many electrons can you fit in this orbital? (3, 2, 1) 2 . (02 pts) 3. A certain electron has the following values for its quantum numbers: (4, x , 2, -1/2). Write all the possible values for x that would make that a possible electron in an atom. (02 pts) Ans: 2 , 3 . 4. Which photon would have more energy, a green one or a blue one? Circle! (02 pts) 5. You are told that the work function for a certain metal is 2.50 × 10 -18 J. Would a photon of 150 Å have enough energy to cause an emission? Yes or No? Circle your answer and prove it in the space below. (08 pts) The only thing we have to do is determine the energy of the incident photon of light and see if it has more or less energy than the work function. The energy of the photon is determined with… E = h c ! Direct substitution yields… E = 6.626 ! 10 -34 Js ! 2.998 ! 10 8 m/s 150 ! 10 -10 m = 1.324 × 10 -17 J . Since the energy of the photon is larger than the work function, then the answer is YES! An electron will be ejected from the atom. 6. How many orbitals in the entire 5
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F03_E2A - Chemistry 111 Page 1 out of 6 Exam II / Fall 2003...

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