Structure of the atom Properties of the atom Atoms combine to form molecules

Structure of the atom properties of the atom atoms

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Structure of the atom Properties of the atom Atoms combine to form molecules Molecules react Energy in chemical reactions Matter & Energy Identity and structure of atom Components of atom Atomic number Average atomic mass isotopes Intro to energy Kinetic energy Potential energy Electrostatic energy Heat and work System & surroundings Exothermic & endothermic enthalpy State function light Electromagnetic spectrum Wavelength and frequency Avogadro’s number Ebook Chapter 1 Mary J. Bojan Chem 110 4
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WHAT IS LIGHT???? (study of light interacting with matter) is needed to learn about of the structure of the atom Mary J. Bojan Chem 110 5 Light can be Emitted: energy (photon) out of system ( Δ E = ) Absorbed: energy (photon) into system ( Δ E = +) Transmitted : passes through without being absorbed Reflected : light changes its direction, is not absorbed or transmitted Diffracted : light bends when it passes through a narrow opening or obstacle F01-6-2: the electromagnetic spectrum Electromagnetic radiation (light) is a form of kinetic energy. Light behaves as a wave! c = λ ν c = 3.00 x 10 +8 m/s for light λ = wavelength = distance between peaks ν = frequency = cycles (waves) per unit time Mary J. Bojan Chem 110 6 How are wavelength and frequency related?
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Unit Symbol λ (m) Type of Radiation Angstrom Å 10 10 Gamma Ray, X-ray Nanometer nm 10 9 Ultraviolet, Visible Micrometer μm 10 6 Infrared Millimeter mm 10 3 Microwave Centimeter cm 10 2 Microwave Meter m 1 TV, radio Kilometer km 10 3 radio Mary J. Bojan Chem 110 7 Know the common wavelength units for different types of electromagnetic radiation ü Know the range of wavelengths for visible light ü Be able to rank different regions of electromagnetic radiation in order of wavelength and frequency! Light behaves as a wave! Or does it??? Several phenomena were inconsistent with the wave nature of light. 8 Black body radiation : radiation emitted by an object. The distribution of radiation emitted is related to the temperature of the object. Cooler objects emit more radiation in the infrared (lower frequencies) while hotter objects emit light at higher frequencies.
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