151F09 Lab02 density D2L

151F09 Lab02 density D2L - GenChem 2nd Class Today's...

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GenChem 2 nd Class Measurement and Identification Today’s Agenda: Develop the day’s problem. Perform first challenge: measure density. Discuss reporting measurements and significant figures. Perform second challenge: determine densities of known plastics. Develop a consensus on the correct values. Perform third challenge: identify unknown plastics. Learn how to write a scientific report.
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GenChem One of the central goals of Chemistry is to analyze chemical substances. 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? Here in the lab you will learn how do we do it
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GenChem Imagine that you are employed by a Imagine that you are employed by a recycling firm. recycling firm. You have been assigned to devise a You have been assigned to devise a quick and cheap method for quick and cheap method for identifying different types of plastics. identifying different types of plastics. How do you propose to do it? How do you propose to do it? The separation needs to be based on the identification of a property that differentiates one type of plastic from another ( differentiating characteristic )
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GenChem In your groups: Analyze each of the plastic samples. Make a list of properties that differentiate one type of plastic from another. Identify those properties that depend on the size of the sample ( extensive ) from those that are not expected to vary with sample size ( intensive ). Select “the property” that you think is the best to differentiate and separate one plastic from another. Let′s think!
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GenChem Density is an intensive property that is commonly used to differentiate and separate plastics during recycling. What do you need to measure to determine
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151F09 Lab02 density D2L - GenChem 2nd Class Today's...

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