151F09Disc03D2L

151F09Disc03D2L - GenChem 3 th meeting Welcome to your Chem...

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GenChem 1 Welcome to your Welcome to your Chem 151 Chem 151 Discussion. Discussion. Where chemistry comes to you! Where chemistry comes to you! 3 th meeting
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GenChem 3 rd Class Separations Today’s Agenda: Look at simple mixtures Study different ways to separate mixtures and the “differentiating characteristic.” Form a group Pick methods to separate mixtures practice, practice and more practice
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GenChem Almost everything in nature is a mixture. All separations are based on the kinds of particles in the mixtures and the forces between them.
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GenChem Chemists use their knowledge and understanding of the properties of substances to separate the different components of materials. Why separate substances? Identification Characterization Elimination Quantitation Application Transformation
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GenChem Simple Filtration Is this a homogeneous mixture? Are they Dissolved in each other? Compare a real water particle to a granule of sand. What are the relative sizes? How would filtering work? You explain What is happening.
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GenChem Sand granule Sand granule S a n d g r u l e Separation Filter Water
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GenChem What is the Differentiating Characteristic in Filtration? SIZE of the non-interacting particles compared to the filter openings FACT: Many ordinary substances like water, alcohols, radiator fluid, most liquids, dissolved sugars, and dissolved salt will pass through most filters. Most solids and large particles will not . Remember this.
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GenChem Hot sterilization of beer Kills bacteria by heating But some beers are COLD sterilized By filtration Explain? Draw a picture of the process. (exam question) ARE you 21 years of age?
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GenChem bacteria bacteria b a c t e r i sterilization Small water, alcohol and flavor particles Industrial filter “rack
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GenChem Draw a picture of filtering just water and alcohol without bacteria.
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GenChem No Separation Filter Water Alcohol
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GenChem When two materials dissolve in each other to make a liquid solution filtration will NOT work then distillation can often separate the Two materials IF they have different boiling points . With the correct apparatus you can cleanly separate the Two materials.
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GenChem Boiling mixture Vapors of the lower boiling substance (weakest forces) come off first Vapors pass through a cooling chamber (condenser) Liquified vapors Collect here The high boiling liquid remains behind, the lower boiling Is separated off
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GenChem Boiling mixture Vapors of lower boiling substance (weakest forces) Come off first Vapors pass through a cooling chamber (condenser) Liquified vapors Collect here The high boiling liquid remains behind, the lower boiling
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at Arizona.

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151F09Disc03D2L - GenChem 3 th meeting Welcome to your Chem...

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