WA 08_CHE-121-jan18.docx - Name Robert Velat College ID...

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Name: Robert Velat College ID: 0254046 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Module 8 Semester and year: JUN2018 Written Assignment 8: The Electronic Structure of Atoms Answer all assigned questions and problems and show all work. All solutions are in BOLD. 1. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 × 10 14 Hz. (a) Calculate the wavelength, in nm, associated with this radiation, and (b) calculate the energy, in joules, of a single photon associated with this frequency. (8 points) (a) c = λ ν λ = c v ν = 7.5 x 10 14 s 1 ;c = 3.00 x 10 8 m / s λ = 3.00 x 10 8 m s 7.5 x 10 14 s 1 = 4.0 x 10 7 m x 1 nm 1.00 x 10 9 m = 4.0 x 10 2 nm (b) E = h = 6.63 x 10 34 J ∙s ν = 7.5 x 10 14 s 1 6.63 x 10 34 J ∙s x 7.5 x 10 14 s 1 = 5.0 x 10 19 J (Reference: Chang 7.16) 2. (a) What is an energy level? Explain the difference between ground state and excited state. (b) What are emission spectra: How do line spectra differ from continuous spectra? (6 points) (a) An energy level is an exact amount of energy an electron can have. Ground state, all electrons are at the lowest level. Excited state, the highest energy electron promoted to a higher-level (b) An emission spectra is a spectrum of the electromagnetic radiation emitted by a source. Emission spectra are produced when excited electrons return to the ground state. Line spectra are emission spectra produced by atoms or molecules that occur only at specific wavelengths. (Reference: Chang 7.23) 3. Explain the statement, matter and radiation have “dual nature.” (3 points) Matter, hypothetically, can have a dual nature while radiation has, what is referred to as a “true” dual nature. Dual nature is the concept that particles in motion can behave like a wave and a wave can exhibit the properties of a particle.
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