c161l03_09_08

c161l03_09_08 - Extensive and Intensive Properties...

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Extensive and Intensive Properties Extensive and Intensive Properties W Extensive properties depend on the amount of substance present (e.g. mass) W Intensive properties do not change when the amount changes (e.g. density) W Most intensive properties are ratios of extensive properties d =m/V
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Accuracy, Precision, and Accuracy, Precision, and Sensitivity Sensitivity W Accuracy measures how close we get to the “true” answer W Precision measure how close we get to the same answer W Sensitivity is what unit we use to measure it
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Classification of Matter Classification of Matter W States Solid – fixed volume and shape Liquid – fixed volume, no defined shape Gas – neither volume nor shape fixed Other states W Pure substances Constant composition Cannot be broken down by physical means
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Chemical vs. Physical Changes Chemical vs. Physical Changes W A process changes the composition of a material is a chemical change W Examples Boiling water (physical) Burning gasoline (chemical)
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c161l03_09_08 - Extensive and Intensive Properties...

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