LS3_a - Unit 1 How do we analyze a system Separating...

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Chemistry XXI Unit 1 How do we analyze a system? Separating Substances
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Chemistry XXI Lab Session 3 How do we separate substances?
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Chemistry XXI Chemical thinking allows us to take advantage of the characteristic properties of substances to separate the different components of materials. Why would we want to separate substances? The Motives
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Chemistry XXI In particular, biological materials tend to be mixtures of hundreds of different substances. What do you know about the properties of substances that cause leaves, flowers, and fruits to be colored? Relevance
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Chemistry XXI The Challenge Imagine that you work for a clothing company interested in using natural pigments to dye fibers. Your task is to devise the most efficient method to separate the pigments in a colored natural product (such as green leaves, flower petals, or a fruit). What would you propose to do?
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Chemistry XXI Initial Tests Extract the pigments from their source. Available resources: Solvents: Acetone, hexane. Pigment sources: Spinach leaves, fruits; Others: Sand, mortar and pestle, glassware. Questions to be answered: What is the best way to extract the pigments from each product? Why? What question would you like to investigate about your extracts? You have 30 minutes
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Chemistry XXI Compare the color and depth of color of your pigment extract with those from other groups.
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This note was uploaded on 04/09/2009 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at Arizona.

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LS3_a - Unit 1 How do we analyze a system Separating...

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