CHEM151_Lab_04 - GenChem Week 4 Today's Agenda: Review...

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GenChem Week 4 Gas Behavior Today’s Agenda: ± ± Develop the day’s problem. ± Perform the first challenge: determine moles of unknown gas. ± Analyze results: identify unknown gas. ± Perform the final challenge: determine moles of another unknown gas. ± Analyze results: Identify the gas. ± Discuss writing the report.
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GenChem Revisiting the central goals of Chemical Analysis. Detection: Does the sample contain substance X? Identification: What is the identity of the substance in this sample? Central Goals and Questions Separation: How can the substances present in the sample be separated? Quantitation: How much of substance X is in the sample? What are we doing today?
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GenChem Identification . How can we identify an unknown gas? Let s think! By identifying some property or set of properties unique to a particular gas.
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GenChem Lets begin by reviewing what we know about gases. What are the properties of gases that are potentially useful? Compare your responses to the pre-lab question. Color? Boiling point? Density? Molar mass? Let s think!
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GenChem Lets consider molar mass. What do you know about the molar mass? Is it an intensive or extensive property? Molar Mass is an intensive property that can be used to identify pure substances.
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GenChem Complete the following table. Let s practice! C 4 H 8 O 2 Ethyl Acetate 3 C 2 H 6 O Ethanol 3 C 8 H 18 Octane 2 C 6 H 12 Cyclohexane 2 C 4 H 8 O Butanone 1 C 3 H 6 O Acetone 1 Molar Mass Formula Compound Group C 3 H 8 O Propanol 6 CH 3 NO 2 Nitromethane 6 C 3 H 6 O 2 Methyl Acetate 5 C 6 H 12 O Hexanol 5 C 6 H 14 Hexane 4 C 7 H 16 Heptane 4 Molar Mass Formula Compound Group You’ll need these values later in the lab .
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This note was uploaded on 06/11/2008 for the course CHEM 151 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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CHEM151_Lab_04 - GenChem Week 4 Today's Agenda: Review...

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