LS5_a - Unit 2 How do we analyze chemical change...

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Chemistry XXI Unit 2 How do we analyze chemical change? Understanding light
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Chemistry XXI Lab Session 5 How can we use light to analyze a system?
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Chemistry XXI Your Challenge You have been hired to provide the lighting for a green ” building. Your task is to rank the efficiency of available light sources in terms of production of visible light versus other types of radiation. How can you determine efficiency of the available light sources?
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Chemistry XXI Analyzing Light Many systems emit light or “ electromagnetic radiation ” when they interact with other systems and undergo a physical or chemical change. The nature of the radiation that is emitted can give us a clue about the properties of the system or the changes that are going on.
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Chemistry XXI Light Properties The amount of energy provided by light, or electromagnetic radiation , depends on the wavelength or frequency of the radiation. λ * ν = c c = Speed of light =
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Chemistry XXI Electromagnetic Spectrum Energy per photon E = h ν = h c/ λ h = Planck’s constant = When light and matter interact, energy is transmitted in packets of energy called “ photons .” Energy Increases
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Chemistry XXI Spectroscopy A variety of powerful analytical techniques are based on the analysis of the types and amount of electromagnetic radiation absorbed or emitted by a chemical substance ( Spectroscopies ).
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A spectrometer is an optical instrument that allows us to measure the amount of light ( number of photons ) as a
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LS5_a - Unit 2 How do we analyze chemical change...

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