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Reaction Paper 3 - Version 170 Exam 1 TTh Sutcliffe(50985...

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Version 170 – Exam 1 TTh – Sutcliffe – (50985) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points If a particle is confined to a one-dimensional box of length 300 pm, for Ψ 3 the particle is most likely to be found at 1. 17.3 pm. 2. 300 pm. 3. 50, 150, and 250 pm, respectively. cor- rect 4. 100 and 200 pm, respectively. 5. 0 pm. Explanation: 002 10.0 points p orbitals are shaped like dumbbells. They can have a principal quantum number of and they always have an angular mo- mentum quantum number of . 1. 2, 3, 4, ...; 2 2. 1, 2, 3, ...; 0 or 1 3. 2, 3, 4, ...; 1 correct 4. 1, 2, 3, ...; 0 5. 2, 3, 4, ...; 1 or 2 6. 1, 2, 3, ...; 2 7. 2, 3, 4, ...; 0 8. 1, 2, 3, ...; 1 Explanation: p -orbitals do not exist below the second principal energy level. Therefore n must be 2 or greater. p -orbitals correspond to an angu- lar momentum quantum number = 1. 003 10.0 points Arrange the following types of photons of elec- tromagnetic radiation in order of decreasing energy: red light, radio, x-rays, γ -rays, in- frared. 1. γ -rays > x-rays > red light > infrared > radio correct 2. x-rays > red light > infrared > γ -rays > radio 3. x-rays > γ -rays > red light > infrared > radio 4. γ -rays > x-rays > radio > infrared > red light 5. radio > red light > infrared > x-rays > γ -rays Explanation: E = h c λ Decreasing energy means increasing wave- length; the order is γ -rays (shortest, high- est energy), x-rays, red light, infrared, radio (longest, lowest energy). 004 10.0 points Which elements are correctly listed in order of INCREASING ionization energy? 1. O < F < Ne correct 2. N < P < As 3. N < O < F 4. O < S < Se 5. C < N < O Explanation: Ionization enegy corresponds to how much energy it takes to ionize an element. Elements with high ionization energies do not want to give up their electrons, low ionization energies mean they do not want to receive an electron,
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Version 170 – Exam 1 TTh – Sutcliffe – (50985) 2 but would rather give one up. In general, ionization energies increase as you move right along a period and up a group. Some atoms (like B, O, Al and S) can achieve more stable electronic configuration in filled or half-filled shells. 005 10.0 points A visible light photon has a than a photon of microwave radiation. 1. lower energy 2. higher frequency correct 3. lower speed 4. longer wavelength 5. greater speed Explanation: 006 10.0 points Which of the following pairs is described as isoelectronic? 1. H and He 2. Ca and Be 3. Na and Na + 4. P and S 2 5. Cu + and Zn 2+ correct Explanation: The number of electrons in each particle is as follows: H : 1; He : 2; Be : 4; Na + : 10; Na : 11; P : 16; S 2 : 18; Ca : 20; Cu + : 28; Zn 2+ : 28. 007 10.0 points Identify the set(s) of four quantum numbers n m m s A. 6 , 0 , 0 , + 1 2 B. 2 , 2 , - 1 , + 1 2 C. 4 , 4 , - 1 , + 1 2 that are FORBIDDEN for an electron in an atom 1. B and C only correct 2. B only 3. A only 4. A and B only 5. All are invalid.
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