General Chem Unit 2 Notes
General Chem Unit 2 Notes CHEM 152
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This 2 page Class Notes was uploaded by Camille Hizon on Thursday January 14, 2016. The Class Notes belongs to CHEM 152 at University of Arizona taught by Hidalgo in Winter2015. Since its upload, it has received 29 views. For similar materials see General Chemistry II in Chemistry at University of Arizona.
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Date Created: 01/14/16
CHEM 151: Unit 2 I. Module 1: Analyzing Light-Matter Interactions a. Introduction i. Central goal: help you understand how to use experimental data on the light emitted or absorbed by chemical substances to derive information and build models about atomic and molecular structure. b. Spectroscopy i. Spectroscopy - based on the analysis of different types of EM radiation absorbed or emitted by chemical substances. ii. EM radiation – form of energy that can be generated by accelerating particles that have electrical charge. Takes form of self-propagating waves that travel through matter or through vacuum at a characteristic speed (v) that depends on the nature of the medium. iii. EM radiation is characterized by wavelength () or frequency (). 1. wavelength – measure of the distance over which the shape of the wave is repeated a. is measured in meters 2. frequency – indicates the number of repeating waves that cross a certain point of space per unit time -1 a. is measured in s or Hertz (Hz) iv. Let’s Think: How does change with increasing ? x=v v. Equation: vi. Speed of propagation of EM waves through vacuum (not the same for material mediums like water or glass) is constant: v = c = 3.00 x 10 m/s. 1. Same value no matter what the wavelength or frequency of the radiation is. vii. Different EM radiation types span the electromagnetic spectrum 1. Includes: X-rays, UV radiation, infrared (IR) radiation, radio waves, and visible light (400nm-700nm) 2. As you move left, frequency INCREASES; as you move right, wavelength INCREASES. viii. Different chemical substances interact in distinctive manners with different types of radiation. 1. Type of EM radiation absorbed or emitted by chemical substance is a differentiating characteristic. ix. In spectroscopy techniques, instruments measure intensity of EM radiation that passes through a sample or is emitted by a substance when heated or stimulated in some other way (like using other types of EM radiation). 1. Detection done at different wavelengths so that a spectrum can be made. 2. Absorbance: fraction of EM radiation of a specific wavelength that was absorbed by substance
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