PracticeExam2b

PracticeExam2b - Tufts University Chem 1 Summer 2008...

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Tufts University Chem 1 Summer 2008 Practice Exam 2b I. Multiple choice questions 1. A lawyer who received a speeding ticket argues that because of the Heisenberg Uncertainty Principle the radar reading is uncertain. The judge, who happens to have a science degree, rules against the lawyer. Which of the following statements is true? (a) The judge is incorrect because the uncertainty in position is large. (b) The judge is correct because the car is so massive that the uncertainty in speed is very small. (c) The judge is correct because the uncertainty in momentum is very large. (d) The judge is incorrect because radar has only wave characteristics. (e) The judge is incorrect because ( Δ x)( Δ p) h/4 π . 2. The electrons in 3s, 3p, or 3d-orbitals (a) always have the same energy (b) have the same energy in a hydrogen atom (c) have the same energy in many-electron atoms (d) always have different energy (e) have different energy in a hydrogen atom 3. The general shape of an orbital is determined by the ___ quantum number, and the orientation is determined by the ____ quantum number (a) n, m l (b) s, l (c) l, m l (d) m l , l (e) n, l (f) l, n 4. For a 4d-orbital, what is the value of the quantum number l ? (a) 1 (b) 2 (c) 3 (d) 4 (e) several values of l are possible 5. What maximum number of electron can be placed in the 3p-orbitals in an atom: (a) 2 (b) 3 (c) 4 (d) 5 (e) 6 (f) 8 (g) 9 6. Which of the following orbitals cannot exist in an atom: (a) 3s (b) 2p (c) 6s (d) 5f (e) 2d 7. The 6s orbital has radial nodes (a) 1 (b) 2 (c) 3 (d) 4 (e) 5 (f) 6 (g) 7
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8. The performance of contrast agents for MRI (magnetic resonance imaging) is improved with increasing number of unpaired electrons in the molecule. Select the best
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PracticeExam2b - Tufts University Chem 1 Summer 2008...

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