151f09Lab04D2L

151f09Lab04D2L - GenChem 4th Class Gas Behavior Today's...

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GenChem Gas Behavior Gas Behavior Today’s Agenda: Review understanding of molar mass & gas properties. 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. 4 th Class
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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 have we done so far?
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GenChem Identification . How can we identify an unknown gas? By identifying some property or set of properties unique to a particular gas. Let′s think!
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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 to those of your fellow group members. 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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Complete the following table. Group Compound Formula Molar Mass 1 Acetone C 3 H 6 O 1 Butanone C 4 H 8 O 2 Cyclohexane C 6 H 12 2 Octane C 8 H 18 3 Ethanol C 2 H 6 O 3 Ethyl Acetate C 4 H 8 O 2 Group Compound Formula Molar Mass 4 Heptane C 7 H 16 4 Hexane C 6 H 14 5 Hexanol C 6 H 12 O 5 Methyl Acetate C 3 H 6 O 2 6 Nitromethane CH 3 NO 2 6 Propanol C 3 H 8 O You’ll need these values later in the lab. Let′s practice!
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151f09Lab04D2L - GenChem 4th Class Gas Behavior Today's...

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