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CH301 Exam 1

CH301 Exam 1 - Version 089 – Exam 1 – Mccord –(50970...

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Unformatted text preview: Version 089 – Exam 1 – Mccord – (50970) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Calculate the longest-wavelength line in the Balmer series for hydrogen. 1. 1875 nm 2. 657 nm correct 3. 182 nm 4. 122 nm 5. 486 nm Explanation: ν = R parenleftbigg 1 n 2 1- 1 n 2 2 parenrightbigg = (3 . 29 × 10 15 Hz) parenleftbigg 1 2 2- 1 3 2 parenrightbigg = 4 . 56944 × 10 14 Hz λ = c ν = 3 . × 10 8 m / s 4 . 56944 × 10 14 Hz = 6 . 56535 × 10- 7 m = 656 . 535 nm 002 10.0 points Which of the following best describes the range of atomic radii? 1. 5 to 10 ˚ A 2. 0.4 to 3 ˚ A correct 3. 10 to 30 ˚ A 4. 1 to 15 ˚ A 5. 0.05 to 1 ˚ A 6. 1 to 100 ˚ A Explanation: Atomic radii vary from 30 pm (He) to 300 pm (Fr). 1 ˚ A= 10- 10 m = 100 pm, so the range of atomic radii is 0.3 to 3 ˚ A. 003 10.0 points How many electrons can possess this set of quantum numbers: principal quantum number n = 4, magnetic quantum number m ℓ =- 1? 1. 12 2. 3. 18 4. 8 5. 16 6. 14 7. 10 8. 4 9. 6 correct 10. 2 Explanation: Use the rules for the quantum numbers: If n = 4 then ℓ = 0 , 1 , 2 , 3; however, for m ℓ =- 1, ℓ = 1 , 2 , 3. Each of these permit- ted sets of values of n , ℓ and m ℓ specifies ONE orbital: n = 4, ℓ = 1, m ℓ =- 1: 4 p n = 4, ℓ = 2, m ℓ =- 1: 4 d n = 4, ℓ = 3, m ℓ =- 1: 4 f and each orbital can have m s = ± 1 2 ; i.e. , can hold two electrons. 004 10.0 points How many s electrons and p electrons does Mn possess? Version 089 – Exam 1 – Mccord – (50970) 2 1. 6 s , 6 p 2. 7 s , 12 p 3. 7 s , 18 p 4. 6 s , 12 p 5. 8 s , 18 p 6. 6 s , 18 p 7. 8 s , 12 p correct 8. 8 s , 6 p 9. 7 s , 13 p Explanation: The electron configuration for Mn is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 5 2 + 2 + 2 + 2 = 8 s 6 + 6 = 12 p 005 10.0 points An electron is confined to a one-dimensional box of length L. It falls from the second en- ergy level to the ground state, and releases a photon with a wavelength of 322 nm. What is the length of the box? 1. 322 nm. 2. 1.61 nm. 3. 292 nm. 4. 4.32 nm. 5. 2.92 nm. 6. 1.14 nm. 7. 0.541 nm. correct 8. 0.151 nm. 9. 0.303 nm. Explanation: 006 10.0 points It takes light with a wavelength of 261 nm, or less, to break the O H bond in wa- ter. What energy does this correspond to (in kJ/photon) and what is the O H bond strength in kJ/mol? 1. 7 . 6 × 10- 22 kJ/photon, 458 kJ/mol cor- rect 2. 6 . 6 × 10- 25 kJ/photon, 4 × 10- 4 kJ/mol 3. 7 . 6 × 10- 22 kJ/photon, 458,000 kJ/mol 4. 6 . 6 × 10- 25 kJ/photon, 0.40 kJ/mol Explanation: 007 10.0 points List in order of increasing atomic size (small- est to largest) the atoms whose atomic num- bers are 6, 32, 7....
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CH301 Exam 1 - Version 089 – Exam 1 – Mccord –(50970...

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