Chem 1 Exam 1 - Panjwani, Sameer Test 1 Due: Jun 21 2007,...

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Panjwani, Sameer – Test 1 – Due: Jun 21 2007, 3:00 pm – Inst: Fakhreddine/Lyon 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. The due time is Central time. Each question is worth as assigned. 001 (part 1 o± 1) 6 points The number o± unpaired electrons in a neutral atom o± iron (atomic number 26) is 1. none. 2. 1. 3. 3. 4. 2. 5. 4. correct Explanation: 002 (part 1 o± 1) 6 points What is the ±requency o± a 500 nm photon? 1. 6 . 0 × 10 - 4 Hz 2. 6 . 0 × 10 5 Hz 3. 3 . 3 × 10 - 22 Hz 4. 3 . 3 × 10 5 Hz 5. 6 . 0 × 10 14 Hz correct Explanation: 003 (part 1 o± 1) 6 points Which o± the ±ollowing individual atoms has a paramagnetic electronic structure? 1. Mg 2. He 3. Be 4. Li correct 5. Ne Explanation: 004 (part 1 o± 1) 6 points How many neutrons are there in one atom o± boron whose mass number is 9? 1. 2 2. 1 3. 3 4. 5 5. 4 correct Explanation: 005 (part 1 o± 1) 8 points What is the energy o± a photon o± 320 nm ultraviolet light? 1. 2 . 10 × 10 - 31 J 2. 2 . 10 × 10 - 40 J 3. 6 . 21 × 10 - 28 J 4. 3 . 0 × 10 +8 J 5. 6 . 21 × 10 - 19 J correct Explanation: We need Planck’s constant and the speed o± light: c = 2 . 998 × 10 8 m / s λ = 320 nm h = 6 . 626 × 10 - 34 J · s Δ E = h ν = h c λ = 6 . 626 × 10 - 34 J · s · 2 . 998 × 10 8 m / s 320 nm · 10 9 nm 1 m = 6 . 21 × 10 - 19 J 006 (part 1 o± 1) 6 points How many unpaired electrons are there in the
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2 ground state electron confguration o± an Fe atom? 1. 3 2. 1 3. 4 correct 4. 0 5. 2 Explanation: 007 (part 1 o± 1) 8 points A car driving at a speed o± 29 miles hour would be driving how ±ast in m/s? 1. 780 m/s 2. 13 m/s correct 3. 2.0 m/s 4. 0.077 m/s 5. 47000 m/s 6. 0.0081 m/s 7. 170000000 m/s Explanation: 29 miles hour × 1 . 609 km 1 mi × 1000 m 1 km × 1 h 3600 s = 12 . 9642 m / s 008 (part 1 o± 1) 8 points How many cubic inches (in 3 ) are in a 55.1 liter aquarium? 1. 162 in 3 2. 3360 in 3 correct 3. 18,700 in 3 4. 23.3 in 3 5. 129 in 3 Explanation: ? in 3 = 55 . 1 L × 1000 mL 1 L × 1 cm 3 1 mL × µ 1 in 2 . 54 cm 3 = 3360 in 3 009 (part 1 o± 1) 6 points Which set o± quantum numbers, n , , m , could correspond to one o± the highest energy electrons in Zr? 1. 4, 2, +3 2. 3, 2, - 2 3. 4, 3, - 2 4. 4, 2, - 2 correct Explanation: 010 (part 1 o± 1) 8 points The atomic weight o± a newly discovered el- ement is 10.600 amu. It has two naturally occuring isotopes. One has a mass o± 10.000 and a natural abundance o± 70.000%. What is the isotopic mass o± the other isotope? 1.
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This note was uploaded on 03/18/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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Chem 1 Exam 1 - Panjwani, Sameer Test 1 Due: Jun 21 2007,...

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