M4_2 - Unit 2 How do we analyze chemical change Module 4...

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Chemistry XXI Unit 2 How do we analyze chemical change? Module 4: Monitoring Composition Central goal: To use absorption and emission spectra to make predictions about the presence of different substances in a given system.
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Chemistry XXI The Challenge Our understanding of how reactive systems evolve, like the atmosphere, depends on our ability to monitor changes in their composition. How can we monitor changes in the composition of a reactive system? How can we detect and quantify changes in the concentration of reactants and products? Analysis Is it here? Is the ozone layer recovering? Is air quality improving?
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Chemistry XXI What is Best? In many cases we are interested in analytical techniques that allow us to monitor composition: without changing the reaction mixture; repeatedly, over long periods of time; in systems that we cannot access directly. What would be a good differentiating characteristic to target?
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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 ). Absorption Spectroscopy: Transmission Data are represented in various ways Absorption Spectrum
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Chemistry XXI Let’s Think Chlorophyll is a chemical substance vital for photosynthesis. It gives leaves their green color. Depict a plausible absorption spectrum for this substance Different substances have different spectra ( spectral signature )
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Chemistry XXI The location of
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M4_2 - Unit 2 How do we analyze chemical change Module 4...

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