Study Guide for Exam 4 CHEM 103A

Study Guide for Exam 4 CHEM 103A - 7.1 and 7.2 concept...

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7.1 and 7.2 concept Review 1. Consider the following types of electromagnetic radiation: (1) microwave (2) ultraviolet (3) radio waves (4) infrared (5) x-ray (6) visible (a) Arrange them in order of increasing wavelength (b) Arrange them in order of increasing frequency (c) Arrange them in order of increasing energy Skill building 2. An AM station broadcasts rock music at “960 on your station dial.” Units for AM frequencies are given in kilohertz (kHz). Find the wavelength of the station’s radio waves in meters (m). Nanometers (nm), and angstroms (Ǻ). 3. A radio wave has a frequency of 3.6 x 10 10 Hz. What is the energy wave in J of one photon of this radiation? Problems in context 4. Police often monitor traffic with “K band” radar guns, which operate in the microwave region at 22.235 GHz (1GHz = 10 9 Hz). Find the wavelength in nm and Ǻ of this radiation.
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5. (a) the first step on the formation of ozone in the upper atmosphere occurs when oxygen molecules absorb UV radiation of wavelengths 242 nm. Calculate the frequency and energy of the least energetic of these photons. (b) Ozone absorbs light having wavelengths of 2200 to 2900 Ǻ, thus protecting organisms on Earth’s surface from this high energy UV radiation. What are the frequency and energy of the most energetic of these photons? Skill building 6. Use the Rydberg equation to calculate the wavelength in nm of the photon emitted when a hydrogen atom undergoes a transition from n = 5 to n = 2 7. What is the wavelength in nm of the least energetic spectral line in the infrared series of the H atom? 8. Calculate the energy difference (ΔE) for the transition in problem 5 for 1 mol of H atom. 9. The electron in a ground state H atom absorbs a photon of wavelength 97.20 nm. To what energy level does the electron move? Problems in context 10. The oxidizing agents that are used in most fireworks consist of potassium salts…the problem is their extremely intense yellow-orange emission at 589 nm, obscures the others colors in display. What is the energy in J of one photon of this light (1 Einstein = 1 mol of photons)?
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11. A 220 lb fullback runs the 40-yd dash at a speed of 19.6 ± 0.1 mi/h (a) What is his de Broglie wavelength in meters? (b) What is the uncertainty in his position? 12. How fast must a 56.5 tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light (5400 Ǻ)? 13. A sodium flame has a characteristic yellow color due to emission of wavelength 589 nm. What is the mass equivalence of one photon of this wavelength (1 J = 1 kg m 2 / 2 )? 7.5 – 7.7 skill building 14. How many orbitals in an atom can have each of the following designations? (a) 1s
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Study Guide for Exam 4 CHEM 103A - 7.1 and 7.2 concept...

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